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The estimated tax gap for the 2023 to 2024 tax year is £46.8 billion.
Find out how much you need to put aside for your Self Assessment tax bill by using HM Revenue and Customs' (HMRC's) Self Assessment tax calculator.
Use HM Revenue and Customs’ (HMRC) tax checker to get an estimate of how much Income Tax you should have paid in a previous tax year.
Understand your Self Assessment tax bill - your tax calculation, statement, balancing payments, payments on account.
Bringing in goods for personal use when you travel to the UK from abroad - types of tax and duty, duty free, EU and non-EU arrivals, banned and restricted goods.
How to work out payments and when you should make them if your company’s annual taxable profits are between £1.5 million and £20 million.
If you’ve missed Self Assessment deadlines get an estimate of how much you’ll need to pay in penalties and interest
Estimate how much Income Tax and National Insurance you can expect to pay for the current tax year (6 April 2026 to 5 April 2027).
Don’t include personal or financial information like your National Insurance number or credit card details.
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