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4497. Message code: 7801 (Authentication Error)
 
Error message: "Accounts Office reference or Employer PAYE reference is incorrect."

What to Do Next: It could be that the Accounts Office reference and Employer PAYE reference (HMRC Office Number & Employer PAYE Reference) in the RTI submission you made, are not relating or matching together. You need to review and check the Accounts Office reference and Employer PAYE reference (HMRC Office Number & Employer PAYE Reference) to ensure that they are entered correctly. If you have not entered then you can find this 13 character Accounts Office reference number on the PAYE payment booklet or letter supplied by HMRC, printed in the format 123PA12345678.

References that are not 13 characters long require zeros (0) entering after the two letters to make it up to 13 characters. For example. 123PA00045678. Please do not include any spaces when entering it on the screen, otherwise it could lead to delays in updating your records.

Road Map - Entering the HMRC E-Filing Credentials
Employer/Setup -> Chart of Setup -> E-Filing -> E-Filing Setup -> Option No. 2 / Option No. 3 -> Edit button -> Save button
( 'Employer/Setup' is the button positioned in the tasking zone menu at the top. It is the first button from the left )