Understand your Self Assessment tax bill

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1. Overview

When you submit a Self Assessment tax return, you鈥檒l get a:聽

Your Self Assessment statement is a summary of what you owe and payments you have made.

Your tax calculation is a summary of the tax you owe for the tax year.

This guide is also available in Welsh (Cymraeg).

Paying your Self Assessment tax bill聽

You need to by midnight on 31 January (following the tax year you鈥檙e paying for) to avoid a penalty.听

Find out what to do .

2. Self Assessment statement

Your Self Assessment statement shows:聽

  • the tax you owe at the time the statement is sent聽

  • any payments on account 诲耻别听

  • any payments you have made (this will show as 鈥楥R鈥� on the statement)聽

  • any outstanding amounts (for example from previous tax years or interest)聽

  • your 鈥榖alancing payment鈥� 鈥� this is the amount you need to pay when your payments on account do not cover the tax you owe聽

When you鈥檒l get your Self Assessment statement聽

You鈥檒l get a statement after you file your tax return or if your circumstances change. This will either be available online or sent through the post.听

If you submit your tax return late or near to the submission deadline, you may not get a Self Assessment statement before your payment deadline.听

This means you may need to use your tax calculation to work out how much tax you owe.听

If you want more help understanding your statement聽

You can watch a video explaining your Self Assessment statement.

3. Tax calculation (SA302)

Your tax calculation (SA302) shows:聽

  • your total income on which tax is 诲耻别听
  • any allowances and relief you have聽
  • the total amount you owe for the tax year聽
  • how HM Revenue and Customs (HMRC) has worked out the amount you owe聽

It does not include any:聽

  • payments on account (payments towards your next bill) you have made聽
  • payments you have made into a
  • other outstanding amounts (such as unpaid tax or penalties)聽

When you鈥檒l get your tax calculation聽

You鈥檒l get a calculation when you鈥檝e filed your Self Assessment tax return or if the amount you owe changes. If you filed online, you can before you submit your return.

You cannot view your calculation for up to 72 hours after you submit your return. If your payment is due in this time, you will need to save a copy of this before you submit.

If you filed a paper return, HMRC will send your calculation by post.听

How to work out how much tax you need to pay聽

HMRC will send you a Self Assessment statement telling you how much you need to pay.听

If you submit your tax return late or close to the deadline

Your statement may not arrive before your payment is due. If you do not have a statement, you鈥檒l need to and view your current balance to work out how much tax you owe.

Get a copy of your tax calculation聽

Find out , for example if you鈥檙e applying for a mortgage or if you need one on HMRC header paper.

4. Payments on account

鈥楶ayments on account鈥� are payments towards your next tax bill (including Class 4 National Insurance if you鈥檙e self-employed).

They help spread the cost of your tax by making payments in 2 instalments. Each payment is half of the tax you owed last year.

These payments are due by midnight on 31 January and 31 July.

You must make these 2 payments, unless either:

  • the amount of tax you owed last year was less than 拢1,000
  • last year you paid more than 80% of the tax you owed outside of Self Assessment (for example through your tax code or because your bank had already deducted interest on your savings)

Your Self Assessment statement or online account will show you how much they are, if you need to pay them.

How payments on account are calculated

Payments on account are calculated based on your estimated earnings (usually the amount you earned the previous year). Each payment is usually half of the tax you owed the previous year.

If you actually earn more than estimated, you may still have tax to pay on top of your payments on account. This is known as a 鈥榖alancing payment鈥�.

If you earn less than estimated, you may be able to claim a tax refund.

If you need to make a balancing payment

This is worked out by deducting the payments on account you鈥檝e made from the total tax you owe.

You must make your balancing payment by midnight on 31 January the following year. This will also include anything you owe for capital gains or student loans (if you鈥檙e self-employed).

If you made payments on account last year

If you made payments on account last year, you鈥檒l need to pay both:

  • your first payment on account towards your next bill
  • any balancing payment you owe (if you still have tax to pay after last year鈥檚 2 payments on account)

Example

Your bill for the 2022 to 2023 tax year is 拢3,000.

Based on your 2021 to 2022 earnings, you made 2 payments of 拢900 each (拢1,800 in total) on 31 January 2023 and 31 July 2023 towards this 鈥� these were your 鈥榩ayments on account鈥�.

Because your payments on account did not cover the amount of tax you owed, you have to make a 鈥榖alancing payment鈥�.

Your amount due by midnight on 31 January 2024 is made up of:

  • your 鈥榖alancing payment鈥� of 拢1,200 for the 2022 to 2023 tax year (拢3,000 minus 拢1,800)
  • the first payment on account of 拢1,500 (half your 2022 to 2023 tax bill) towards your 2023 to 2024 tax bill

This means the total you will have paid is 拢2,700 by 31 January 2024.

You then make a second payment on account of 拢1,500 on 31 July 2024.

If your tax calculation for the 2023 to 2024 tax year is more than 拢3,000 (the total of your 2 payments on account), you鈥檒l need to make a 鈥榖alancing payment鈥� by 31 January 2025.

If you did not make payments on account last year

If you did not make any payments on account last year (for example, because it鈥檚 your first time filing Self Assessment) you鈥檒l need to pay both:

  • the full amount of your tax calculation
  • your first payment on account towards your next bill

Example

Your bill for the 2022 to 2023 tax year is 拢3,000.

The total tax to pay by midnight on 31 January 2024 would be 拢4,500. This includes:

  • your 拢3,000 tax bill for 2022 to 2023
  • the first payment on account of 拢1,500 (half your 2022 to 2023 tax bill) towards your 2023 to 2024 tax bill

You then make a second payment on account of 拢1,500 on 31 July 2024.

If your tax bill for the 2023 to 2024 tax year is more than 拢3,000 (the total of your 2 payments on account), you鈥檒l also need to make a 鈥榖alancing payment鈥� by 31 January 2025 as well as your first payment on account for the next tax year.

If your total tax for the year is 拢3,000, the only payment you will need to make by 31 January 2025 is your first payment on account for the following tax year.

Check your payments on account

  1. .

  2. Select the option to view your latest Self Assessment return.

  3. Select 鈥榁iew statements鈥�.

You鈥檒l then be able to see:

  • payments on account you鈥檝e already made
  • payments you need to make towards your next tax calculation

If you filed a paper return, you can check the payments on account you made on your last Self Assessment Statement.

Reduce your payments on account

If you know the tax you owe is going to be lower than last year, you can ask HM Revenue and Customs (HMRC) to reduce your payments on account.

You can do this either online or by post.

You will need to include the amount you expect to make so HMRC can use this to work out your new payments on account.

To reduce your payments on account online

  1. .

  2. Select the option to view your latest Self Assessment return.

  3. Select 鈥楻educe payments on account鈥�.

To reduce your payments on account by post

Send form SA303 to your tax office.

If your bill is higher than you expected

If you reduce your payments on account and your tax bill is higher than expected, you鈥檒l be charged interest on the difference. You can check the interest rates to find out how much interest you鈥檒l be charged.