Self Assessment tax returns

Skip contents

If you need to change your return

You can make a change to a tax return after you filed it, for example because you made a mistake.

Your bill will be updated based on what you report. You may have to pay more tax or be able to claim a refund.

Updating your tax return

You can correct a tax return within 12 months of the Self Assessment deadline, online or by sending another paper return.

Example

For the 2023 to 2024 tax year, you바카라 사이트™ll usually need to change your return by 31 January 2026.

If you miss the deadline or if you need to make a change to a return from an earlier tax year you바카라 사이트™ll need to write to HMRC.

Online tax returns

You must wait 3 days (72 hours) after filing before updating your return.

  1. .

  2. From 바카라 사이트˜Your tax account바카라 사이트™, choose 바카라 사이트™Self Assessment account바카라 사이트™.

  3. Choose 바카라 사이트˜More Self Assessment details바카라 사이트™.

  4. Choose 바카라 사이트˜At a glance바카라 사이트™ from the left-hand menu.

  5. Choose 바카라 사이트˜Tax return options바카라 사이트™.

  6. Choose the tax year for the return you want to amend.

  7. Go into the tax return, make the corrections and file it again.

Paper tax returns

For the main Self Assessment tax return you can:

You can download all other forms and supplementary pages.

You then need to send the corrected pages to the address on your Self Assessment paperwork.

Write 바카라 사이트˜amendment바카라 사이트™ on each page and include your name and Unique Taxpayer Reference (UTR) - this is on previous tax returns or letters from HMRC.

If you cannot find the address, you can send your corrections to:

Self Assessment
HM Revenue and Customs
BX9 1AS

If you used commercial software

Contact the software provider for help correcting your tax return. Contact HMRC if your software is not able to make corrections.

Changes to your bill

You바카라 사이트™ll see your amended bill straight away if you updated your tax return online. Within 3 days, your statement will also show:

  • the difference from the old one, so you can see whether you owe more or less tax
  • any interest

To view this, and choose 바카라 사이트˜View statements바카라 사이트™ from the left-hand menu.

If you바카라 사이트™re owed tax

You may be able to claim a tax refund.

If you need to pay more tax

Your updated bill will also show:

If you sent an updated paper return

HMRC will send you an updated bill. You can check when you can expect a reply from HMRC.

They바카라 사이트™ll pay any refund directly into your bank account, as long as you include your bank details on your tax return.

If you바카라 사이트™ve missed the deadline to change your return

You must contact HMRC in writing if you need to make changes to your tax return more than 12 months after the Self Assessment deadline. This includes making a change to an earlier tax year.

You바카라 사이트™ll also need to write HMRC a letter to:

  • report income you did not include in your tax return
  • claim overpayment relief (if you think you바카라 사이트™ve overpaid tax)

You can claim overpayment relief up to 4 years after the end of the tax year it relates to.

What to include

You must include:

  • the tax year you바카라 사이트™re correcting
  • why you think you바카라 사이트™ve paid too much or little tax
  • how much you think you바카라 사이트™ve over or underpaid
  • your signature (no one else can sign on your behalf)

If you바카라 사이트™re making an overpayment relief claim, you must also include in your letter:

  • that you바카라 사이트™re making a claim for overpayment relief
  • if you바카라 사이트™ve previously made an appeal for the same payment
  • a signed declaration saying that the details you바카라 사이트™ve given are 바카라 사이트˜correct and complete to the best of your information and belief바카라 사이트™

You also need to keep evidence that you바카라 사이트™ve paid tax through Self Assessment for the relevant period as HMRC may ask for this at a later date.

If you do not include all of this information your claim will be rejected.

You can also tell HMRC how you want to be repaid in your letter.

View a printable version of the whole guide

Related content