Use the online service or postal form to apply to reduce your Self Assessment payments on account.
To reduce the amounts you’ve been asked to pay if:
- your business profits or other income goes down
- the tax relief you are entitled to goes up
- use the Verify online service - you’ll need an account with GOV.UK Verify – it’ll take you about 15 minutes to sign up if you don’t already have an account and you’ll soon be able to use it with other government services
- fill in the postal form on-screen, print and post it to HM Revenue and Customs