Corporation Tax — service availability and issues
Updated 26 February 2026
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Service availability
If you’re trying to create, sign in or reset your sign in details, check for known problems with HMRC online services.
Sign in to Corporation Tax online.
Planned downtime
None.
Service issues
Find out about changes and issues that may affect how you use the Corporation Tax online service to file your Company Tax Return.
Other services
Check availability and issues for other services.