I am getting error 1046 when I send data to HMRC. What could be wrong?

This means 'Authentication Failure. The supplied user credentials failed validation for the requested service'. The possible reasons for this error are:-
  • User ID is wrong
  • Password is wrong (Try logging in at the HMRC site)
  • You registered your HMRC account for PAYE but haven't yet received the activation PIN
  • The PAYE Reference on the Employer details page is wrong (Log in to the HMRC site to see what reference they hold)
  • The User ID is for a different business
  • The HMRC gateway is too busy

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