ASA and Government Gateway portal agent ids 2021

Before you begin, check that you have the appropriate credentials for submissions.

If you confuse the MTD ASA ids with your agent Gateway ids, then it could appear that you are authorised since the passwords are of similar length and type, but ultimately the submission will fail.

HMRC Agents Online Service ids for submitting tax returns or Government Gateway Ids.

Online Filing Passwords

When entering the password(s), use capitalisation as used when first creating this password with HMRC.

Tick / untick the option not validated / authorised for filing if you aren't entering ids to submit both CT and SA returns and save the changes. 

Alternatively, if you have separate ids for SA and CT tax submissions, then untick the option not relevant for the code you are entering, which will, after saving these details, then allow you to create the second set of ids for this submission.
Always save the changes.

The ASA ids for MTD for VAT and viewing online client data:
Connections - 

HMRC VAT / MTD

If you have older MTD ids entered for viewing online client data, then disconnect and then re-connect entering the new Ids for MTD as requested when setting up this link.
If the ids are recognised then the message will display 'Taxfiler by IRIS is authorised......'
Your original SA MTD clients should automatically be registered to the new ASA ids if you tick this option within HMRC when prompted to transfer the clients across.

For Full  Agent Access you will need to be prepared to give passport, NI and other such personal information as requested by HMRC when authorising the link. 

For VAT Only access, you will need to enter your new VAT MTD ids as confirmed by HMRC via email.