When using the system's end of year or P46 (car) File by Internet (FBI) functionality, the P11D Organiser will need to use your Government Gateway username and password in order to make the submission successfully.
During a preparation or attempting to send a live submission, your username and password are authenticated with the Government Gateway, if they cannot be verified then the software will present a pop-up dialogue box to state the problem.
To amend the HMRC credentials you need to navigate to the View Employer Details screen and click on the HMRC Details option.
From here you can click on the Set Gateway sender ID and password button to be able to enter your details
If this still fails, see below....
Check your username and password with the Government Gateway:
We recommend that you use the HMRC's own websites to check that you are entering the correct credentials (username and password).
Use the links below to check if you can login successfully to the Government Gateway:
Screenshot of the Gateway 1
Screenshot of the Gateway 2 (incorrect credentials)
Screenshot of the Gateway - Confirmation of PAYE ref(s) you can submit for
Once you have verified these with the Government Gateway and have then successfully logged in to the Government Gateway, you should return to the P11D Organiser system, launch the HMRC Filing screen again to re-enter your credentials, you should now be able to make a successful submission.
Check your Company Name & PAYE Reference number
Another possible cause of authentication error can be the PAYE Reference, Company Name or Accounts office ref number saved in the system have been entered incorrectly. Check these by viewing the COMPANY details screen and editing/changing these if they are incorrect.
e.g. The first 3 digits of the PAYE Reference number has been mistakenly entered twice!