HMRC “Authentication Failure”

Check you have entered the correct credentials


Make sure your credentials are entered correctly. See Online Filing Passwords.You may have different credentials for CT and SA filing so make sure you have entered the correct ids. You must ensure you are using valid agent credentials and not client credentials. You do NOT need valid authorisation for the client to file (e.g. 64-8), but you must be using valid credentials for the correct service.


Please make sure you are using the correct id and password for the return you are filing. You cannot use an individual’s id and password to file a partnership or trust return – they must have their own id and password.

Check that you have entered the correct UTR

If the UTR is incorrect you should unlock the tax return submission before changing it.

Using income losses against capital gains

Firstly, please ensure that you are making the best use of the losses before proceeding. Select the Capital gains tab from the data input screen Click on the Disposals tab, and enter the relevant information Click on the Capital Losses tab, and enter the amount of loss that you wish to set off against the […]

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Restricting access to clients

This feature is only available for multiuser accounts, it has been designed so that you can restrict user access for certain clients if required. Users with “edit client access” rights AND who have access to a client can assign or remove access rights via the Access tab on the client screen. The default is that […]

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User restrictions within Taxfiler

This function is only available for a multiuser license. Some functions within Taxfiler can be restricted from a user. From the SETTINGS icon select Users and select the user that you wish to edit Select Restrictions tab You will be presented with several functions which can be selected or removed via a tick box. For […]

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