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What is a 1046 authentication error?

Article ID: 1046
Last updated: 29 Jun, 2021

When you receive a 1046 error message in TaxCalc (as shown above), it means one of the following:

  • HMRC hold different details to what has been input into TaxCalc prior to the submission attempt
  • There is a block on your HMRC account.
    • This can happen if you have attempted to file a number of times with a failure (if you try 3-5 times in quick succession this locks your account for 2 hours)
    • Your UTR has been disabled or blocked from allowing online submissions.

To go through this error message, please see the links below for written instructions based on your scenario, or download our PDF step by step guide which illustrates the steps required in a flow chart. 

I am an agent trying to file a client’s tax return

I am trying to file an individual tax return (SA100) for myself or friends and family

I am trying to file a partnership tax return (SA800) for myself or friends and family

I am trying to file a trust tax return (SA900) for myself or friends and family

I am trying to file a limited company tax return (CT600) for myself or friends and family

Article ID: 1046
Last updated: 29 Jun, 2021
Revision: 21
Views: 107568
This article was:  


Also read
item Error #5017 - Known Facts Check - Failed to match tax reference
item 1046 - I am an agent trying to file a client’s tax return
item 1046 - I am trying to file a partnership tax return (SA800) for myself or friends and family
item 1046 - I am trying to file an individual tax return (SA100) for myself or friends and family
item 1046 - I am trying to file a trust tax return (SA900) for myself or friends and family
item 1046 - I am trying to file a limited company tax return (CT600) for myself or friends and family

Also listed in
folder Tax Return Production -> Filing Online
folder Tax Return Production -> SA900 Trust Return
folder Tax Return Production -> SA100 Individual Return
folder Tax Return Production -> SA800 Partnership Return
folder Tax Return Production -> CT600 Corporation Tax Return