UK Tax & Self Assessment Guides: HMRC Returns, Rates, and Refunds
Navigating HM Revenue & Customs (HMRC) requires understanding PAYE deductions, Self Assessment thresholds, and National Insurance contributions.
In the United Kingdom, individuals with untaxed income, sole traders, partners, and high earners must complete an annual Self Assessment tax return. Online returns and payments must be finalized by 31 January following the end of the tax year on 5 April. Salaried employees taxed automatically through Pay As You Earn (PAYE) can claim refunds for employment expenses, professional fees, or pension tax relief through their Personal Tax Account. Our step-by-step guides walk you through registering for Self Assessment, tracking your tax code, reclaiming overpaid tax with Forms P50 and P55, and reporting cryptoasset gains.
All Taxes Guides (UK)
6 guides
Are you self-employed? Are you a landlord? Do you have income that has not been taxed? Then you must sign up for Self Assessment. You get a UTR. You must file your return by 31 January after the tax year ends. File online. Pay by the deadline. Watch out for payments on account. They can surprise you. From 6 April 2027 the trading allowance rises to £3,000, the Making Tax Digital limit drops to £30,000, and property and savings income is taxed at 24%, 44% and 49%.
8 steps · 1–2 hours (plus registration wait) · Free to file yourself2025-Latest
HMRC takes too much tax from millions of workers each year. This often happens because of emergency tax codes. It can also happen when you change jobs mid-year. Or when you do not claim reliefs you are owed. Check your Personal Tax Account. Most people claim a refund online in 5 minutes. HMRC also sends P800 letters for many overpayments.
6 steps · 5 min check; online refunds usually within 2 weeks · Free2025-Latest
Did you stop working part-way through the tax year? Did you pay too much tax? Form P50 asks HMRC to check and refund the overpayment. It takes 15 minutes online. Repayments usually arrive within 4 weeks.
7 steps · 15 minutes · Free2025-Latest
Did you take part of your pension as a flexible lump sum? Were you taxed at an emergency rate? Form P55 reclaims the overpayment. HMRC repays within about 4 weeks. Refunds commonly run into the hundreds or thousands of pounds.
6 steps · 20 minutes · Free2025-Latest
Form R40 is the catch-all HMRC repayment claim for people who do not file Self Assessment. Use it for overtaxed bank interest. Use it for years when your income went down. Use it for tax wrongly deducted before you left the UK.
6 steps · 30–60 minutes · Free2025-Latest
HMRC taxes crypto like any other thing you own. You pay Capital Gains Tax when you sell or swap it for a profit. You pay Income Tax on staking rewards and on mining. Most people only need to fill in the CGT pages of a Self Assessment return. You also need good records of every trade.
6 steps · 2–4 hours · Free (self-file) to £150+ (accountant)2025-Latest
FAQ
Frequently Asked Questions
Common questions and essential rules for taxes in United Kingdom.
When is the UK Self Assessment tax return deadline?
For online returns, the deadline is midnight on 31 January following the end of the tax year (e.g., 31 January 2026 for the 2024/25 tax year). Paper tax returns must be submitted earlier by 31 October.
Do salaried employees on PAYE need to file a Self Assessment return?
Most employees paying tax through PAYE do not need to file, unless they have untaxed income over £1,000 or dividend income. They must file if they have self-employment earnings, or are subject to the High Income Child Benefit Charge.
How do I claim a refund if I overpaid income tax in the UK?
HMRC automatically recalculates your tax after the tax year ends and sends a P800 calculation. You can claim your refund online into your bank account through your personal tax account on gov.uk or HMRC app.
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