Search all content on GOV.UK

What to do if you need to pay more tax or you're due a refund, including P800 tax calculations from HM Revenue and Customs (HMRC).

• If you’ve not paid the right amount of tax

  If you’ve paid too much or too little tax by the end of the tax year (5…

• If your tax calculation letter (P800) says you’re due a refund

  Your tax calculation letter (also known as a P800) will tell you how you…

• If your tax calculation letter (P800) says you owe tax

  HM Revenue and Customs (HMRC) will collect the tax you owe over the next…

Use this service if you need to repay money you owe from a benefit.

If a registered pension scheme has had UK Income Tax deducted from its investment income you can ask HMRC to repay the tax.

• Updated: 23 April 2015

Self Assessment tax returns - deadlines, who must send a tax return, penalties, corrections and returns for someone who has died.

How to claim a refund in the current tax year if you are not getting taxable benefits or a pension from your employer and you've not started a new job (P50).

• Updated: 23 August 2024

VAT repayments - work out if you're due a VAT repayment using your VAT Return

Business expenses you can claim if you're self-employed

How to charge VAT, calculate VAT, VAT rates, reclaim VAT on business expenses, keep digital records.

Universal Credit is replacing 6 other benefits with a single monthly payment if you're out of work or on a low income - eligibility, how to prepare.

Correct mistakes with pay and deductions including National Insurance (NI), amend errors in FPS payroll reports, correct payments to HMRC.