Guidance

Corporation Tax: service availability and issues

Check the availability and any issues affecting the Corporation Tax online service.

Document

Details

Latest updates on the availability and any issues affecting the Corporation Tax online service.

Published 24 August 2015
Last updated 4 January 2018 + show all updates
  1. A message about some customers experiencing technical difficulties and delayed submission responses has been added to the page.
  2. Service availability section updated.
  3. The service issues section has been updated.
  4. There is a service availability issue causing delayed submission responses.
  5. A service issue message about HMRC's Corporation Tax free filing software has been added.
  6. The 'Changes that may affect your Company Tax Return - Loss reform' section has been amended with new information about filing your return.
  7. The CT600 Return submission problem has been resolved.
  8. The service issues section has been updated.
  9. CT600 Return submission problem has now been resolved.
  10. The service issues section has been updated.
  11. The service issues section has been updated.
  12. The 'Service issues' section has been updated.
  13. The 'Service issues' section has been updated.
  14. The service issues message about the Corporation Tax online return service - returns with an accounting period ending after 31 March 2017 has been updated as the problem is now resolved.
  15. New message at 'Service issues' added due to online problems with the CATO service.
  16. This guidance has been updated to show latest service issues.
  17. Information regarding HMRC's joint filing service and free filing services for Company Tax Returns has been updated.
  18. Information regarding HMRC's free filing service for company tax returns has been updated.
  19. The routine renewal of Adobe CT600 Trusted certificate section has been updated to reflect the renewal of the embedded certificate.
  20. Spring Budget 2016 content removed
  21. Agents unable to log in to their online account issue updated to show the problem has now been resolved.
  22. The service issues section has been updated to remove the HM Revenue and Customs online filing software - computations trading losses summary page issue.
  23. The 'Agents unable to log in to their online account' message has been updated.
  24. A service issue message has been added to the page.
  25. The Spring Budget 2016: changes that may affect your Company Tax Return section has been updated.
  26. 'Error 9316/9965 using HM Revenue and Customs/Adobe return' paragraph added to the page under service issues.
  27. Removal of 'Changes that may affect your Company Tax Return' section.
  28. Service issues section has been updated.
  29. The service issues section has been updated with information about essential maintenance for Companies House online services.
  30. The service issues section has been updated with information from the Spring Budget 2016 about changes that may affect your Company Tax Return.
  31. Important changes to HMRC's free filing service for company tax returns
  32. Service issues section has been updated.
  33. Routine renewal of Adobe CT600 Trusted certificate message added to the page.
  34. Planned downtime has been added to this page.
  35. Downtime for Corporation Tax online service has been added to this page.
  36. Latest updates on creating a new Government Gateway account.
  37. First published.