ONESOURCE Platform - Emergency Backend Service maintenance in EMEA
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 12, 2026 - 11:00 CST
Update - ONESOURCE Platform will be performing maintenance on one of our backend services in EMEA to ensure optimal performance and reliability.

ONESOURCE API Administration's UID Certificates are approaching its yearly renewal. UID Certificates renewal in EMEA will be performed during this maintenance window.

During this maintenance window, some services may be temporarily affected from 12th Jan @ 11:00 AM CST to 11:30 AM CST; please try again later if you encounter issues, we apologize for any inconvenience and appreciate your patience. For urgent assistance during this period, contact our support team. Thank you for your cooperation.
Jan 12, 2026 11:00-17:00 CST
Scheduled - ONESOURCE Platform will be performing maintenance on one of our backend services in EMEA to ensure optimal performance and reliability.
We recommend to the ONESOURCE Platform users with active sessions, to please save your work before the beginning of this maintenance window.
During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Jan 12, 2026 11:00-17:00 CST
WorkFlow Tools Operational
AMERS Calendar Operational
AMERS Calendar Classic Operational
AMERS FileRoom Operational
AMERS WorkFlow Operational
AMERS WorkFlow Manager Classic Operational
APAC Calendar Operational
APAC Calendar Classic Operational
APAC FileRoom Operational
APAC WorkFlow Operational
APAC WorkFlow Manager Classic Operational
EMEA Calendar Operational
EMEA Calendar Classic Operational
EMEA FileRoom Operational
EMEA WorkFlow Operational
EMEA WorkFlow Manager Classic Operational
Platform Under Maintenance
AMERS (onesourcetax.com) Operational
AMERS (onesourcelogin.com) Operational
AMERS Administration Operational
AMERS API Administration Operational
AMERS UAT (uat.onesourcetax.com) Operational
AMERS UAT (uat.onesourcelogin.com) Operational
APAC (apac1.onesourcetax.com) Operational
APAC (onesourcelogin.com.au) Operational
APAC Administration Operational
APAC API Administration Operational
EMEA (emea1.onesourcetax.com) Under Maintenance
EMEA (onesourcelogin.eu) Under Maintenance
EMEA Administration Under Maintenance
EMEA API Administration Operational
UAT API Administration Operational
Data Tools Operational
AMERS Audit Manager Operational
AMERS DataFlow Operational
AMERS Data Hub Operational
AMERS General Ledger Manager Operational
AMERS R&D Tax Credit Manager Operational
AMERS SAP Trial Balance Integration Operational
AMERS Workpapers Operational
APAC Audit Manager Operational
APAC DataFlow Operational
APAC Data Hub Operational
APAC General Ledger Manager Operational
APAC R&D Tax Credit Manager Operational
APAC SAP Trial Balance Integration Operational
APAC Workpapers Operational
EMEA Audit Manager Operational
EMEA DataFlow Operational
EMEA Data Hub Operational
EMEA General Ledger Manager Operational
EMEA SAP Trial Balance Integration Operational
EMEA R&D Tax Credit Manager Operational
EMEA Workpapers Operational
Direct Tax Operational
AMERS (web) BEPS Action Manager Operational
AMERS DAC6 Reporter Operational
AMERS Data Query Operational
AMERS GoSystem Tax RS Operational
AMERS GoSystem Tax RS API Operational
AMERS Income Tax Operational
AMERS Income Tax API Operational
AMERS State Apportionment Operational
AMERS (legacy) Statutory Reporting Operational
AMERS (web) Statutory Reporting Operational
AMERS (New) Tax Provision Operational
AMERS Tax Provision Operational
AMERS Uncertain Tax Positions Operational
APAC (legacy) Corporate Tax Operational
APAC (web) Corporate Tax Operational
APAC (web) E-filing Manager (Corporate Tax) Operational
APAC (web) Fringe Benefits Tax Operational
APAC (legacy) Statutory Reporting Operational
APAC (web) Statutory Reporting Operational
APAC Tax Provision Operational
APAC Trusts (AU) Operational
APAC Uncertain Tax Positions Operational
EMEA (web) BEPS Action Manager Operational
EMEA (legacy) Corporate Tax Operational
EMEA (web) Corporate Tax Operational
EMEA (web) E-filing Manager (Corporate Tax) Operational
EMEA DAC6 Reporter Operational
EMEA (legacy) Statutory Reporting Operational
EMEA (web) Statutory Reporting Operational
EMEA Tax Provision Operational
EMEA Uncertain Tax Positions Operational
Global Trade Operational
Global Trade Content Operational
Global Trade - LATAM Operational
Global Trade - pwd by Integration Point Operational
Govt Connectivity BE - PLDA Operational
Govt Connectivity DE - ATLAS Operational
Govt Connectivity FR - DELTA Operational
Govt Connectivity MX - SAAI/COVE Operational
Govt Connectivity NL - AGS Operational
Govt Connectivity UK - CHIEF/CDS Operational
Govt Connectivity US - ABI/AES Operational
GTM Platform Operational
Implementation Environment Operational
ONESOURCE Classifier Operational
Transports AS2 Operational
Transports Client Interchange Web Service Operational
Transports FTP Operational
Indirect Tax Operational
ONESOURCE Determination Enterprise Cloud (AWS AMER) Operational
ONESOURCE Determination Enterprise Cloud (AWS EMEA) Operational
ONESOURCE Determination Enterprise Cloud (OCI AMER) Operational
ONESOURCE Determination Anywhere (AWS AMER) Operational
ONESOURCE Determination Anywhere (OCI AMER) Operational
Configuration API (AWS AMER) Operational
Configuration API (AWS EMEA) Operational
Configuration API (OCI AMER) Operational
ONESOURCE Determination Original Cloud (AMER) Operational
ONESOURCE Determination Original Dedicated Cloud (AMER) Operational
ONESOURCE Determination Original Dedicated Cloud (EMEA) Operational
Certificate Manager Original Cloud Operational
Certificate Manager Enterprise Cloud Operational
Reports and Analytics Enterprise Cloud Operational
Reporting - Original Cloud Operational
US Tax Content Operational
Canada Tax Content Operational
International Tax Content Operational
Content Extract Operational
Fast Sales Tax Operational
ONESOURCE Property Tax Operational
ONESOURCE Sales and Use Tax Compliance (AMER) Operational
ONESOURCE Indirect Compliance (APAC) Operational
APAC (web) E-filing Manager (Indirect Compliance) Operational
ONESOURCE Indirect Compliance (EMEA) Operational
EMEA (web) E-filing Manager (Indirect Compliance) Operational
ONESOURCE Indirect Compliance (UAT) Operational
ONESOURCE E-Invoicing (PROD) Operational
ONESOURCE E-Invoicing (UAT) Operational
ONESOURCE Determination - On Premise Operational
ONESOURCE Determination (APAC) Operational
IDT Integrations Operational
Address Validation Service Operational
BigCommerce Operational
Coupa Operational
Data File Integrator - Enterprise Cloud Operational
Data File Integrator - Original Cloud Operational
Microsoft Dynamics 365 - Commerce Cloud Operational
Microsoft Dynamics 365FOE Operational
Microsoft Dynamics AX 2012 Operational
Microsoft Dynamics GP Operational
NetSuite Legacy/Direct Operational
NetSuite SuiteTax Operational
Oracle EBS R12 Operational
Oracle Fusion Tax Cloud - 1.x Operational
Oracle Fusion Tax Cloud - 2.x Operational
Salesforce Subscription Management Operational
SAP 5.2B Basic (RFC) Operational
SAP Ariba - Cloud Operational
SAP Ariba - OnPremise Operational
SAP Ariba - Original cloud Operational
SAP Business One Operational
SAP C4/HANA Commerce Cloud Operational
SAP Global Next Operational
SAP Global Tax Service Operational
SAP US Tax S4/HANA Cloud Operational
Trust & Info Rptg Operational
AMERS NRA - FNIS & Users Website Operational
AMERS Tax Information Reporting Operational
AMERS Trust Tax Operational
AMERS Trust Tax Insight Operational
Risk Solutions Operational
AMERS Compliance Learning Operational
AMERS Oden Online (State Rules and Regulations) Operational
AMERS Oden Policy Terminator Operational
AMERS Oden Track (web) Operational
AMERS Regulatory Intelligence Operational
ANZ Compliance Learning Operational
APAC Compliance Learning Operational
APAC Regulatory Intelligence Operational
EMEA Compliance Learning Operational
EMEA Regulatory Intelligence Operational
Tax Brazil Operational
Checkpoint Corporate Operational
ONESOURCE DFe Operational
ONESOURCE Tax Analyser Operational
Tax One for SAP® solutions Operational
Tax Brazil - Tax One Operational
Tax One - Application [AMERS] Operational
Tax One - Application [UAT AMERS] Operational
Sending and Receiving Files [AMERS] Operational
Sending and Receiving Files [UAT AMERS] Operational
File/Email Processing [AMERS] Operational
File/Email Processing [UAT AMERS] Operational
ECF/REINF (messaging/integration) [AMERS] Operational
ECF/REINF (messaging/integration) [UAT AMERS] Operational
Tax Automation [AMERS] Operational
Tax Automation [UAT AMERS] Operational
OBI [AMERS] Operational
OBI [UAT AMERS] Operational
Tax One - Application [EMEA] Operational
Tax One - Application [UAT EMEA] Operational
Sending and Receiving Files [EMEA] Operational
Sending and Receiving Files [UAT EMEA] Operational
File/Email Processing [EMEA] Operational
File/Email Processing [UAT EMEA] Operational
ECF/REINF (messaging/integration) [EMEA] Operational
ECF/REINF (messaging/integration) [UAT EMEA] Operational
Tax Automation [EMEA] Operational
Tax Automation [UAT EMEA] Operational
OBI [EMEA] Operational
OBI [UAT EMEA] Operational
Customer Support Operational
Case Management Dashboard Operational
Platform Operational
Workflow Tools Operational
Data Tools Operational
Direct Tax Operational
Global Trade Operational
Indirect Tax Operational
Trust & Info Rptg Operational
Legal Solutions Operational
Risk Solutions Operational
Tax Brazil Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance

Scheduled Maintenance

ONESOURCE IDT Determination Enterprise Cloud - Urgent Platform Maintenance in the PROD EMEA Environment Jan 12, 2026 12:00-13:00 CST

Scheduled - We are performing an urgent ONESOURCE Determination Enterprise Cloud platform maintenance activity in the PROD environment on January 12, 2026, between 12:00 PM - 1:00 PM CST. You might encounter occasional errors with the User Interface and REST APIs during this activity, which may result in temporary tax calculation issues. If this happens, simply try your request again.
Jan 07, 2026 - 17:57 CST

ONESOURCE Platform - Emergency Backend Service maintenance in AMER Jan 13, 2026 00:00-06:00 CST

Update - ONESOURCE Platform will be performing maintenance on one of our backend services in AMER to ensure optimal performance and reliability.

ONESOURCE API Administration's UID Certificates are approaching its yearly renewal. UID Certificates renewal in AMER will be performed during this maintenance window.

During this maintenance window, some services may be temporarily affected from 13th Jan @ 12:00 AM CST to 12:30 AM CST; please try again later if you encounter issues, we apologize for any inconvenience and appreciate your patience. For urgent assistance during this period, contact our support team. Thank you for your cooperation.
Jan 07, 2026 - 18:03 CST
Scheduled - ONESOURCE Platform will be performing maintenance on one of our backend services in AMER to ensure optimal performance and reliability.
We recommend to the ONESOURCE Platform users with active sessions, to please save your work before the beginning of this maintenance window.
During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Dec 22, 2025 - 12:46 CST

ONESOURCE Income Tax Jan 13, 2026 00:00-01:30 CST

ONESOURCE Income Tax will be undergoing maintenance on Tuesday, Jan 13th between 12:00am – 1:30am CT
Posted on Jan 06, 2026 - 14:23 CST

ONESOURCE IDT Determination Enterprise Cloud - Urgent Platform Maintenance in the PROD AMER Environment Jan 13, 2026 01:00-02:00 CST

Update - We will be undergoing scheduled maintenance during this time.
Jan 08, 2026 - 10:20 CST
Scheduled - We are performing an urgent ONESOURCE Determination Enterprise Cloud platform maintenance activity in the PROD environment on January 13, 2026, between 1:00 AM - 2:00 AM CST. You might encounter occasional errors with the User Interface and REST APIs during this activity, which may result in temporary tax calculation issues. If this happens, simply try your request again.
Jan 07, 2026 - 17:57 CST

ONESOURCE IDT Determination Enterprise Cloud - Backend Maintenance in the UAT Environment (EMEA) Jan 13, 2026 09:00-11:00 CST

ONESOURCE Determination Enterprise Cloud (EMEA) - We are performing an urgent maintenance activity in the UAT environment on January 13, 2026, between 10:00 AM - 12:00 PM ET. You might encounter occasional errors with the REST APIs during this activity, which may result in temporary tax calculation issues. If this happens, simply try your request again.
Posted on Jan 09, 2026 - 06:10 CST

ONESOURCE IDT Determination Enterprise Cloud - Backend Maintenance in the UAT Environment (AMER) Jan 14, 2026 09:00-11:00 CST

ONESOURCE Determination Enterprise Cloud (AMER) - We are performing an urgent maintenance activity in the UAT environment on January 14, 2026, between 10:00 AM - 12:00 PM ET. You might encounter occasional errors with the REST APIs during this activity, which may result in temporary tax calculation issues. If this happens, simply try your request again.
Posted on Jan 09, 2026 - 06:09 CST

ONESOURCE Data Query Jan 15, 2026 16:00-20:00 CST

ONESOURCE Data Query will be undergoing maintenance on Thursday, Jan 15th between 4:00pm – 8:00pm CT.
Posted on Jan 08, 2026 - 16:15 CST

ONESOURCE GTM – AWS Maintenance Jan 18, 2026 00:00-17:00 CST

Thomson Reuters will be performing scheduled maintenance on Sunday, January 18th, 2026 beginning at 1 AM Eastern time and will conclude by Sunday, January 18th, 2026 at 6 PM Eastern time.

The maintenance will include updates and patches to implementation and production environments. During this maintenance there will be intermittent downtime, and you will not be able to access implementation and production instances.

If you have any questions or concerns, please contact Customer Support.
Posted on Dec 09, 2025 - 13:44 CST

ONESOURCE IDT Determination Enterprise Cloud: New 2026 SSL Certificates installation in UAT on January 18, 2026 Jan 18, 2026 09:00-09:30 CST

ONESOURCE IDT Determination Enterprise Cloud will deploy new SSL certificates in UAT between 9:00 AM and 9:30 AM CST on January 18, 2026. Ensure required root/intermediate certificates are installed in your systems by January 17, 2026.
Posted on Jan 05, 2026 - 14:21 CST

ONESOURCE IDT Determination Original Cloud: New 2026 SSL Certificates installation in UAT on January 21, 2026 Jan 21, 2026 21:00-22:00 CST

ONESOURCE IDT Determination Original Cloud will deploy new SSL certificates in UAT between 9:00 PM and 10:00 PM CST on January 21, 2026. Ensure required certificates are installed in your systems by January 20, 2026.
Posted on Jan 09, 2026 - 15:49 CST

OSPI Platform – UAT Major release for January 2026 Jan 23, 2026 00:00-06:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Jan 07, 2026 - 10:06 CST

ONESOURCE Income Tax Jan 23, 2026 00:00-01:30 CST

ONESOURCE Income Tax will be undergoing maintenance on Friday, Jan 23rd between 12:00am – 1:30am CT
Posted on Jan 06, 2026 - 14:23 CST

OSPI Platform – UAT Major Release January 2026 Jan 23, 2026 00:00-06:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Dec 23, 2025 - 10:41 CST

ONESOURCE IDT Determination Original Cloud: New 2026 SSL Certificates installation in PROD on January 23, 2026 Jan 23, 2026 21:00-22:00 CST

ONESOURCE IDT Determination Original Cloud will deploy new SSL certificates in PROD between 9:00 PM and 10:00 PM CST on January 23, 2026. Ensure required certificates are installed in your systems by January 22, 2026.
Posted on Jan 09, 2026 - 15:49 CST

ONESOURCE IDT Determination Enterprise Cloud: New 2026 SSL Certificates installation in PROD on January 25, 2026 Jan 25, 2026 09:00-09:30 CST

ONESOURCE IDT Determination Enterprise Cloud will deploy new SSL certificates in Production between 9:00 AM and 9:30 AM CST on January 25, 2026. Ensure required root/intermediate certificates are installed in your systems by January 24, 2026.
Posted on Jan 05, 2026 - 14:21 CST

OSPI Platform – APAC Major Release January 2026 Jan 27, 2026 05:00-11:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Dec 23, 2025 - 10:41 CST

OSPI Platform – APAC Major release for January 2026 Jan 27, 2026 07:00-13:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Jan 07, 2026 - 10:07 CST

ONESOURCE Determination Enterprise Cloud– Version 2026.01 Release Information (PROD EMEA environment) Jan 28, 2026 03:00-07:00 CST

ONESOURCE Determination Enterprise Cloud– Version 2026.01 is being deployed in the PROD EMEA environment on January 28, 2026. Your access to the tax calculation services and the application will not be interrupted.
Posted on Jan 05, 2026 - 09:43 CST

OSPI Platform – EMEA Major Release January 2026 Jan 28, 2026 11:00-17:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Dec 23, 2025 - 10:41 CST

OSPI Platform – EMEA Major release for January 2026 Jan 28, 2026 16:00-22:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Jan 07, 2026 - 10:07 CST

OSPI Platform – AMER Major Release January 2026 Jan 30, 2026 00:00-06:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Dec 23, 2025 - 10:41 CST

OSPI Platform – AMER Major release for January 2026 Jan 30, 2026 00:00-06:00 CST

ONESOURCE Platform will be performing scheduled maintenance on our systems to ensure optimal performance and reliability. During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Posted on Jan 07, 2026 - 10:08 CST

ONESOURCE Determination Enterprise Cloud– Version 2026.01 Release Information (PROD AMER environment) Feb 4, 2026 03:00-09:00 CST

ONESOURCE Determination Enterprise Cloud– Version 2026.01 is being deployed in the PROD AMER environment on February 04, 2026. Your access to the tax calculation services and the application will not be interrupted.
Posted on Jan 05, 2026 - 09:45 CST

ONESOURCE Determination Anywhere – Version 2026.01 Release Information (PROD environment) Feb 4, 2026 05:00-11:00 CST

ONESOURCE Determination Anywhere – Version 2026.01 is being deployed in the PROD environment on February 04, 2026. Your access to the tax calculation services and the application will not be interrupted.
Posted on Jan 05, 2026 - 09:53 CST

ONESOURCE Tax Information Release OTIR Release 25.07 17th February 2026 (AMERS) Feb 17, 2026 19:00 - Feb 18, 2026 06:00 CST

ONESOURCE Tax Information Reporting Release 25.07 will be installed from 7:00 P.M. (CT) on 17th February 2026 until 06:00 A.M. (CT) on 18th February 2026. System availability and API's may be affected during release time.
Posted on Jan 21, 2025 - 04:31 CST

ONESOURCE Tax Information Reporting System Maintenance 21st March 2026 (AMERS) Mar 21, 2026 22:00 - Mar 22, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 21st March 2026 until 07:00 A.M. (CT) on 22nd March 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:21 CST

ONESOURCE Tax Information Release OTIR Release 26.01 21st April 2026 (AMERS) Apr 21, 2026 19:00 - Apr 22, 2026 06:00 CDT

ONESOURCE Tax Information Reporting Release 26.01 will be installed from 7:00 P.M. (CT) on 21st April 2026 until 06:00 A.M. (CT) on 22nd April 2026. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:23 CST

ONESOURCE Tax Information Reporting System Maintenance 25th April 2026 (AMERS) Apr 25, 2026 22:00 - Apr 26, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 25th April until 07:00 A.M. (CT) on 26th April for scheduled maintenance.
Posted on Nov 20, 2025 - 05:24 CST

ONESOURCE Tax Information Reporting System Maintenance 23rd May 2026 (AMERS) May 23, 2026 22:00 - May 24, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 23rd May  2026 until 07:00 A.M. (CT) on 24th May 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:25 CST

ONESOURCE Tax Information Release OTIR Release 26.02 16th June 2026 (AMERS) Jun 16, 2026 19:00 - Jun 17, 2026 06:00 CDT

ONESOURCE Tax Information Reporting Release 26.02 will be installed from 7:00 P.M. (CT) on 16th June 2026 until 06:00 A.M. (CT) on 17th June 2026. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:26 CST

ONESOURCE Tax Information Reporting System Maintenance 27th June 2026 (AMERS) Jun 27, 2026 22:00 - Jun 28, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 27th June 2026 until 07:00 A.M. (CT) on 28th June  2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:46 CST

ONESOURCE Tax Information Reporting System Maintenance 25th July 2026 (AMERS) Jul 25, 2026 22:00 - Jul 26, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 25th July 2026 until 07:00 A.M. (CT) on 26th July 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:32 CST

ONESOURCE Tax Information Release OTIR Release 26.03 11th August 2026 (AMERS) Aug 11, 2026 19:00 - Aug 12, 2026 06:00 CDT

ONESOURCE Tax Information Reporting Release 26.03 will be installed from 7:00 P.M. (CT) on 11th August 2026 until 06:00 A.M. (CT) on 12th August 2026. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:33 CST

ONESOURCE Tax Information Reporting System Maintenance 22nd August 2026 (AMERS) Aug 22, 2026 22:00 - Aug 23, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 22nd August 2026 until 07:00 A.M. (CT) on 23rd August 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:34 CST

ONESOURCE Tax Information Release OTIR Release 26.04 20th October 2026 (AMERS) Oct 20, 2026 19:00 - Oct 21, 2026 06:00 CDT

ONESOURCE Tax Information Reporting Release 26.04 will be installed from 7:00 P.M. (CT) on  20th October 2026 until 06:00 A.M. (CT) on 21st October 2026. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:35 CST

ONESOURCE Tax Information Reporting System Maintenance 24th October 2026 (AMERS) Oct 24, 2026 22:00 - Oct 25, 2026 07:00 CDT

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 24th October 2026 until 07:00 A.M. (CT) on 25th October 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:36 CST

ONESOURCE Tax Information Reporting System Maintenance 21st November 2026 (AMERS) Nov 21, 2026 22:00 - Nov 22, 2026 07:00 CST

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 21st November  2026 until 07:00 A.M. (CT) on 22nd November 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:37 CST

ONESOURCE Tax Information Release OTIR Release 26.05 1st December 2026 (AMERS) Dec 1, 2026 19:00 - Dec 2, 2026 06:00 CST

ONESOURCE Tax Information Reporting Release 26.05 will be installed from 7:00 P.M. (CT) on 1st December 2026 until 06:00 A.M. (CT) on 2nd December 2026. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:38 CST

ONESOURCE Tax Information Release OTIR Release 26.06 22nd December 2026 (AMERS) Dec 22, 2026 19:00 - Dec 23, 2026 06:00 CST

ONESOURCE Tax Information Reporting Release 26.06 will be installed from 7:00 P.M. (CT) on 22nd December 2026 until 06:00 A.M. (CT) on 23rd December 2026. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:38 CST

ONESOURCE Tax Information Reporting System Maintenance 26th December 2026 (AMERS) Dec 26, 2026 22:00 - Dec 27, 2026 07:00 CST

ONESOURCE Tax Information Reporting and API's will be unavailable from 10:00 P.M. (CT) on 26th December 2026 until 07:00 A.M. (CT) on 27th December 2026 for scheduled maintenance.
Posted on Nov 20, 2025 - 05:39 CST

ONESOURCE Tax Information Release OTIR Release 26.07 16th February 2027 (AMERS) Feb 16, 2027 19:00 - Feb 17, 2027 06:00 CST

ONESOURCE Tax Information Reporting Release 26.07 will be installed from 7:00 P.M. (CT) on 16th February 2027 until 06:00 A.M. (CT) on 17th February 2027. System availability and API's may be affected during release time.
Posted on Nov 20, 2025 - 05:48 CST
Jan 12, 2026

Unresolved incident: ONESOURCE Platform - Emergency Backend Service maintenance in EMEA.

Jan 11, 2026
ONESOURCE Income Tax
Completed - The scheduled maintenance has been completed.
Jan 11, 02:01 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 11, 00:00 CST
Scheduled - ONESOURCE Income Tax will be undergoing maintenance on Sunday, Jan 11th between 12:00am - 2:00am CT, users may see a brief degradation in the application while we are performing the maintenance.
Jan 8, 16:15 CST
ONESOURCE Data Query
Completed - The scheduled maintenance has been completed.
Jan 11, 02:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 11, 00:00 CST
Scheduled - ONESOURCE Data Query will be undergoing maintenance on Sunday, Jan 11th between 12:00am - 2:00am CT, users may see a brief degradation in the application while we are performing the maintenance.
Jan 9, 14:23 CST
Jan 10, 2026
ONESOURCE Oracle Fusion Rate to Regime Content release for CANADA JANUARY 2026
Completed - The scheduled maintenance has been completed.
Jan 10, 12:31 CST
Scheduled - ONESOURCE Oracle Fusion Rate to Regime Content release Content for CANADA region for JANUARY 2026 has been released. It is available in both Integration UI and customer portal for download.
Jan 9, 10:17 CST
ONESOURCE Oracle Fusion Rate to Regime Content release for AEM JANUARY 2026
Completed - The scheduled maintenance has been completed.
Jan 10, 12:31 CST
Scheduled - ONESOURCE Oracle Fusion Rate to Regime Content release Content for AEM region for JANUARY 2026 has been released. It is available in both Integration UI and customer portal for download.
Jan 9, 10:15 CST
ONESOURCE Oracle Fusion Rate to Regime Content release for LATAM JANUARY 2026
Completed - The scheduled maintenance has been completed.
Jan 10, 12:31 CST
Scheduled - ONESOURCE Oracle Fusion Rate to Regime Content release Content for LATAM region for JANUARY 2026 has been released. It is available in both Integration UI and customer portal for download.
Jan 9, 10:17 CST
ONESOURCE Oracle Fusion Rate to Regime Content release for US JANUARY 2026
Completed - The scheduled maintenance has been completed.
Jan 10, 12:30 CST
Scheduled - ONESOURCE Oracle Fusion Rate to Regime Content release Content for US region for JANUARY 2026 has been released. It is available in both Integration UI and customer portal for download.
Jan 9, 10:18 CST
ONESOURCE Oracle Fusion Rate to Regime Content release for INDIA JANUARY 2026
Completed - The scheduled maintenance has been completed.
Jan 10, 12:30 CST
Scheduled - ONESOURCE Oracle Fusion Rate to Regime Content release Content for INDIA region for JANUARY 2026 has been released. It is available in both Integration UI and customer portal for download.
Jan 9, 10:16 CST
Jan 9, 2026
ONESOURCE Platform - Emergency Backend Service maintenance in APAC
Completed - The scheduled maintenance has been completed.
Jan 9, 11:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 9, 05:00 CST
Update - ONESOURCE Platform will be performing maintenance on one of our backend services in APAC to ensure optimal performance and reliability.

ONESOURCE API Administration's UID Certificates are approaching its yearly renewal. UID Certificates renewal in APAC will be performed during this maintenance window.

During this maintenance window, some services may be temporarily affected from 9th Jan @ 05:00 AM CST to 05:30 AM CST; please try again later if you encounter issues, we apologize for any inconvenience and appreciate your patience. For urgent assistance during this period, contact our support team. Thank you for your cooperation.
Jan 7, 18:03 CST
Scheduled - ONESOURCE Platform will be performing maintenance on one of our backend services in APAC to ensure optimal performance and reliability.
We recommend to the ONESOURCE Platform users with active sessions, to please save your work before the beginning of this maintenance window.
During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Dec 22, 12:46 CST
ONESOURCE Platform – Emergency Backend Service maintenance in UAT
Completed - The scheduled maintenance has been completed.
Jan 9, 06:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 9, 00:00 CST
Update - ONESOURCE Platform will be performing maintenance on one of our backend services in UAT to ensure optimal performance and reliability.

ONESOURCE API Administration's UID Certificates are approaching its yearly renewal. UID Certificates renewal in UAT will be performed during this maintenance window.

During this maintenance window, some services may be temporarily affected from 9th Jan @ 12:00 AM CST to 12:30 AM CST; please try again later if you encounter issues, we apologize for any inconvenience and appreciate your patience. For urgent assistance during this period, contact our support team. Thank you for your cooperation.
Jan 7, 18:03 CST
Scheduled - ONESOURCE Platform will be performing maintenance on one of our backend services in UAT to ensure optimal performance and reliability.
We recommend to the ONESOURCE Platform users with active sessions, to please save your work before the beginning of this maintenance window.
During this maintenance window, certain services may experience some issues. In such cases, we recommend trying after some time. We apologize for any inconvenience this may cause and appreciate your patience and understanding. If you have any urgent inquiries or require assistance during the maintenance period, please contact our support team. Thank you for your cooperation.
Dec 22, 12:46 CST
ONESOURCE IDT Determination Enterprise Cloud - Urgent Platform Maintenance in the UAT Environment
Completed - The scheduled maintenance has been completed.
Jan 9, 02:01 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 9, 01:01 CST
Scheduled - We are performing an urgent ONESOURCE Determination Enterprise Cloud platform maintenance activity in the UAT environment on January 9, 2026, between 1:00 AM - 2:00 AM CST. You might encounter occasional errors with the User Interface and DA data sync during this activity.
Jan 8, 10:22 CST
ONESOURCE IDT Determination Enterprise Cloud - Urgent Platform Maintenance in the UAT Environment
Completed - The scheduled maintenance has been completed.
Jan 9, 02:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 9, 01:00 CST
Update - We will be undergoing scheduled maintenance during this time.
Jan 8, 10:19 CST
Scheduled - We are performing an urgent ONESOURCE Determination Enterprise Cloud platform maintenance activity in the UAT environment on January 9, 2026, between 1:00 AM - 2:00 AM CST. You might encounter occasional errors with the User Interface and REST APIs during this activity, which may result in temporary tax calculation issues. If this happens, simply try your request again.
Jan 7, 17:57 CST
Jan 8, 2026
ONESOURCE Indirect Compliance Maintenance Event (R2026.01) planned on Thursday 08th January 2026
Completed - The scheduled maintenance has been completed.
Jan 8, 22:30 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 8, 18:30 CST
Scheduled - Database maintenance event in progress to deploy R2026.01

There will be limited service during this deployment.
Jan 2, 01:10 CST
ONESOURCE Indirect Compliance Maintenance Event (R2026.01) planned on Thursday 08th January 2026
Completed - The scheduled maintenance has been completed.
Jan 8, 11:01 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 8, 07:00 CST
Scheduled - Database maintenance event in progress to deploy R2026.01

There will be limited service during this deployment.
Jan 2, 01:07 CST
ONESOURCE Determination Enterprise Cloud– Version 2026.01 Release Information (UAT AMER environment)
Completed - The scheduled maintenance has been completed.
Jan 8, 11:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 8, 03:00 CST
Scheduled - ONESOURCE Determination Enterprise Cloud– Version 2026.01 is being deployed in the UAT AMER environment on January 08, 2026. Your access to the tax calculation services and the application will not be interrupted.
Jan 5, 08:37 CST
ONESOURCE Determination Anywhere – Version 2026.01 Release Information (UAT environment)
Completed - The scheduled maintenance has been completed.
Jan 8, 11:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 8, 05:00 CST
Scheduled - ONESOURCE Determination Anywhere – Version 2026.01 is being deployed in the UAT environment on January 08, 2026. Your access to the tax calculation services and the application will not be interrupted.
Jan 5, 08:43 CST
ONESOURCE Oracle Fusion Rate to Regime Content release for US DECEMBER 2025
Completed - The scheduled maintenance has been completed.
Jan 8, 10:20 CST
Scheduled - ONESOURCE Oracle Fusion Rate to Regime Content release Content for US region for DECEMBER 2025 has been released. It is available in both Integration UI and customer portal for download.
Nov 25, 22:52 CST
Intermittent HIGH Latency and Tax calculation API failures in AMER UAT
Resolved - This incident has been resolved.
Jan 8, 05:11 CST
Update - We are continuing to investigate this issue.
Jan 8, 03:03 CST
Update - We are continuing to investigate this issue.
Jan 8, 02:58 CST
Investigating - We are currently experiencing intermittent issues with the Tax Calculations feature with our One Source Indirect Tax Determination Enterprise service.

Our team is actively working to resolve this matter as quickly as possible. We apologize for any inconvenience and appreciate your understanding and patience.

Further updates will be provided here as soon as we have more information. If you have any questions, please contact Customer Support.
Jan 8, 00:32 CST
Jan 7, 2026
High latency and Intermittent SOAP and REST Tax Calculation Failures in OCI - UAT
Resolved - This incident has been resolved.
Jan 7, 23:17 CST
Investigating - We are currently experiencing intermittent issues with the Indirect Tax Calculations feature with our ONESOURCE Indirect Tax Determination Enterprise service. Our team is actively working to resolve this matter as quickly as possible. We apologize for any inconvenience and appreciate your understanding and patience.

Further updates will be provided here as soon as we have more information. If you have any questions, please contact Customer Support.
Jan 7, 17:30 CST
Jan 6, 2026
ONESOURCE Determination Enterprise Cloud– Version 2026.01 Release Information (UAT EMEA environment)
Completed - The scheduled maintenance has been completed.
Jan 6, 07:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 6, 03:00 CST
Scheduled - ONESOURCE Determination Enterprise Cloud– Version 2026.01 is being deployed in the UAT EMEA environment on January 06, 2026. Your access to the tax calculation services and the application will not be interrupted.
Jan 5, 08:35 CST
Jan 5, 2026
Delay in Data for reports and analytics service in AMER PROD
Resolved - This incident has been resolved.
Jan 5, 07:07 CST
Investigating - Reports and Analytics Service in AMER PROD is currently experiencing delay of around 6 hours 30 mins. We are working on the data catch up, will notify once complete.
Jan 5, 04:27 CST
Jan 4, 2026
ONESOURCE GTM – AWS Maintenance
Completed - The scheduled maintenance has been completed.
Jan 4, 17:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 4, 00:00 CST
Scheduled - Thomson Reuters will be performing scheduled maintenance on Sunday, January 4th, 2026 beginning at 1 AM Eastern time and will conclude by Sunday, January 4th, 2026 at 6 PM Eastern time.

The maintenance will include updates and patches to implementation and production environments. During this maintenance there will be intermittent downtime, and you will not be able to access implementation and production instances.

If you have any questions or concerns, please contact Customer Support.
Dec 9, 10:52 CST
Jan 3, 2026

No incidents reported.

Jan 2, 2026
ONESOURCE Global Trade - Single Sign On Certificate Update
Completed - The scheduled maintenance has been completed.
Jan 2, 08:30 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jan 2, 08:00 CST
Scheduled - Thomson Reuters has updated the certificate that expires on January 5, 2026, for Single Sign-On customer encrypting SAML assertions. This is only applicable if SAML assertions are encrypted on the client side. An email was sent on December 4th with the new certificate for clients to update. Please make sure you update this certificate before January 5, 2025, when it expires.

If you did not receive the certificate AND you encrypt SAML assertions, please send an email to IntegrationPoint@ThomsonReuters.com subject line "SSO Certificate".
Dec 4, 14:51 CST
Jan 1, 2026

No incidents reported.

Dec 31, 2025
ONESOURCE Tax Information Release OTIR Release 25.06 30th December 2025 (AMERS)
Completed - The scheduled maintenance has been completed.
Dec 31, 06:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Dec 30, 19:00 CST
Scheduled - ONESOURCE Tax Information Reporting Release 25.06 will be installed from 7:00 P.M. (CT) on 30th December 2025 until 06:00 A.M. (CT) on 31st December 2025. System availability and API's may be affected during release time.
Aug 20, 10:07 CDT
ONESOURCE Trust Tax 26.00 Scheduled Release and System Downtime for Dec 30-31 (AMERS)
Completed - The scheduled maintenance has been completed.
Dec 31, 00:00 CST
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Dec 30, 20:00 CST
Scheduled - Access to all ONESOURCE Trust Tax applications will be suspended beginning at 8:00 P.M. (CT) on Tuesday, December 30, 2025. The 26.00 release of ONESOURCE Trust Tax will be available no later than 12:00 A.M. (CT) on Wednesday, December 31.
Dec 24, 09:37 CST
Dec 30, 2025
Dec 29, 2025
ONESOURCE Global Trade -- Intermittent workflow slowness
Resolved - This incident has been resolved.
Dec 29, 15:30 CST
Investigating - Thomson Reuters is currently investigating an intermittent issue with the workflow performance. Clients may notice some delays in their processing. We are working to address the intermittent issues now and will update once resolved.
Dec 29, 13:06 CST
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