Article ID: 2025205 Last Updated: 31 October 2022
When making a Full Payment Submission or Employer Payment Summary submission, you may encounter Error 1046, Authentication Failure.
This message is generated by the government gateway login server and relates to the authentication details (username / password / etc.) being provided by your attempted submission.
The HMRC gateway cross-checks 4 pieces of information in order to authenticate and allow a submission.
If any one of the following items does not match your government gateway record, the submission will fail with Error 1046:
• The Tax Office Number is usually 3 or 4 digits. For example 123.
• The Tax Office Reference is usually a letter and 3 numbers, or sometimes two letters and 3 or 4 numbers. For example, A777 or AB345.
Note: HMRC usually provides the Tax Office Number and Reference as one number separated with a slash, for example 123/A777 or 123/AB345.