If you receive a status from HMRC of Delayed Response when attempting to file online, this usually means that HMRC's processing systems are very busy.
This won't affect the submission of the return itself but it does mean that the Submission Finished message won't be as prompt as usual.
When you submit tax return data, HMRC processes the data and TaxCalc polls for a response (either Success or Fail). This usually comes back within 10–15 seconds but it can sometimes take a lot longer.
If HMRC's processing slows right down and a response isn't received within a reasonable amount of time, TaxCalc displays the Resume button. Clicking on the Resume button polls the gateway and attempts to complete the process. The gateway holds the responses for up to 28 days.
To collect a delayed response from HMRC, follow these steps:
Note: TaxCalc will only attempt to collect a delayed response on live submissions. If you've filed a test submission to HMRC, TaxCalc won't display the Resume button but HMRC will email you with the response as soon as it's available. These submissions will need to be resubmitted.