The HMRC online corporation tax filing service is currently suffering from the following problems.
Using HMRC’s corporation tax online service to notify a change in trading status
Taxpayers who are already registered for the corporation tax online service are not currently able to use the online registration service to notify HMRC of a change in trading status.
Those already registered (have a user ID and password for the Corporation Tax online service) who need to tell HMRC that a company or organisation has ceased to be dormant and is now active, will need to notify HMRC in writing.
HMRC’s free Corporation Tax online return service not showing final submission response
HMRC is aware that the free corporation tax online return service may not display the final submission status during filing.
Taxpayers who submit returns using the HMRC service will receive an on-screen acknowledgment (‘Submission successful’ or ‘Submitted’) during online filing, but this doesn’t confirm the final status. Taxpayers using the free service need to login again and check the dashboard to establish the submission outcome, which will be either ’Submission error’ or ‘Submission complete’ (successful).
Taxpayers are strongly advised to log back into the service following online submission and view the dashboard from which you can track your submissions to determine the final submission status anytime within 30 days of filing.