Corporation Tax — service availability and issues
Updated 25 March 2024
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Service availability
If you’re trying to create, sign in or reset your user ID or password, check for known problems with Government Gateway.
Sign in to Corporation Tax online.
Planned downtime
Friday 10 May 2024 4pm to 8am Monday 13 May 2024
Due to scheduled maintenance, you will be unable to register for Corporation Tax from 4pm on Friday 10 May 2024 to 8am on Monday 13 May 2024.
We apologise for any inconvenience this may cause.
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.
Delays in receiving return submission responses
You may find there is a delay in receiving your return submission response when submitting your CT600 form online. If you experience this delay, you should keep requesting the HMRC business response using your software.
If you do not receive your online submission response after 48 hours you should contact the online service helpdesk
We are working to resolve this issue we apologise for any inconvenience this may cause.
Other services
Check availability and issues for other services.