SelfSubmit is designed to help you stay compliant with HMRC Making Tax Digital requirements. You remain responsible for ensuring the information you submit is accurate.

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MTD Sign Up

Joining MTD means registering for Self Assessment (if needed), choosing software, and authorising it with Government Gateway credentials.

  • Register for Self Assessment by 5 October after starting
  • HMRC may notify you when you must join MTD ITSA
  • Authorise each software product you use

What it is

Signing up involves registering for Self Assessment (if needed), choosing compatible software, and authorising it to interact with HMRC. HMRC may invite you when you approach the income threshold.

Keep Government Gateway details safe and enable two-step verification. Update your address and email in HMRC online services so you receive sign-up prompts and penalty warnings.

Who it applies to

Newly self-employed people, landlords crossing the threshold, and businesses starting to trade.

What you need to do

  • Register for Self Assessment by 5 October after the tax year you started.
  • Follow HMRC letters or messages about MTD sign-up dates.
  • Authorise your software using your Government Gateway credentials.

Key points

  • You need a Government Gateway user ID and password.
  • Keep your contact details updated in your HMRC account.

Common mistakes to avoid

  • Starting to trade without any HMRC registration
  • Using software without completing the HMRC connection step
  • Sharing Gateway credentials with untrusted third parties

How SelfSubmit helps

Create your SelfSubmit account, complete profile and business setup, and start monthly records — you will be ready when live HMRC connection goes live for your situation.

Further reading