Known Issue: CRA 503 Error when attempting to file slips
An issue when attempting to file slips may result in a CRA "503 error". This is due to a URL change on the Canada Revenue Agency's (CRA) website. To fix the issue, please follow the instructions outlined in the following article: CRA ERROR CODE 503.0 - The Web address for Federal EFILE does not redirect to the appropriate CRA page

End of Phone Support: Benefit from our Advanced Virtual Agent 24/7!
As of January 1, 2025, the customer support teams will offer its high-quality service exclusively through digital channels, and will no longer offer incoming phone support. See the communication sent on this matter for further details.
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New! Support Platform Help Centre
Having trouble registering or logging in to the platform? The Support Platform Help Centre contains a live chat that will allow you to chat with a real agent to resolve these technical issues. It also centralizes all the articles and videos you need to get the best out of the web ticketing system.
Important note: The live chat staff will ONLY be able to assist you with login issues – any other request will need to be submitted via a support case, once the login issue has been resolved. 

This week most consulted articles from our Knowledge Base

1. CRA Efile error - account number given in the attached T619 electronic transmittal records does not match the account number you used to sign in
2. CRA ERROR CODE 503.0 - The web address for Federal EFILE does not redirect to the appropriate CRA page
3. Forms - What identification numbers do I need to be able to file slips or a T5013 return electronically, and how do I set the options in the program?
4. Forms Transmission of Slip - The MM number is not accepted anymore. How to proceed?
5. How do I register for the ''support.cch.com/oss/canada'' Support Platform?
6. I'm not able to transmit slips electronically for 2023 and prior years
7. Cannot log in to the ''support.cch.com/oss/canada'' Support Platform
8. How do I reset my password on the ''support.cch.com/oss/canada'' Support Platform? 
9. FAQ – FT32024-001 – FTF2023-002 - Electronic transmission of the slips and the T5013 return – Annual CRA system update period for electronic filing applications
10. Forms - How to set up the information for Electronic Services - Identification
11. T4 Summary - Forms Program CPP2 (box 16A) is missing in version 2024 v1.0