HMRC Authorisation for Income Tax Self Assessment

Before you can submit any data, you must give My Tax Digital permission to interact with your Income Tax Self Assessment account on HMRC's system.

1. From the Self Assessment home screen, click on HMRC Authorisation.

2. You must ensure you have signed up for Making Tax Digital for Income Tax first by visiting either:

   • Sign up for Making Tax Digital for Income Tax if you’re an individual

   • Sign up your client for Making Tax Digital for Income Tax if you’re an agent

3. Ensure you meet the HMRC MTD requirements for Income Tax Self Assessment and opt-in for your chosen tax year.

4. It can take upto 72 hours for HMRC to confirm your MTD opt-in, but once they have, click on the 'Continue to HMRC' button

5. This will redirect you to the HMRC site where you will be prompted to authenticate with your Government Gateway ID and password.

6. IMPORTANT: If you have multiple Government Gateway IDs, make sure you enter the one for your Self Assessment account otherwise you'll receive the response, The client or agent is not authorised. and you'll then need to click start again.