Tax in United Kingdom

Who is the tax authority in the United Kingdom?

His Majesty's Revenue and Customs (HMRC) is the UK's non-ministerial department responsible for tax administration, the collection of National Insurance contributions, the payment of certain state benefits, and the regulation of the National Minimum Wage. HMRC was formed in 2005 by the merger of the Inland Revenue and HM Customs and Excise. It administers Income Tax, Corporation Tax, Value Added Tax, Inheritance Tax, Capital Gains Tax, Stamp Duty Land Tax (England and NI), and Petroleum Revenue Tax. Scotland and Wales have devolved revenue authorities — Revenue Scotland and the Welsh Revenue Authority — handling the devolved taxes (Land and Buildings Transaction Tax, Land Transaction Tax, Scottish Landfill Tax, Welsh Landfill Disposals Tax). HMRC's Income Tax Manual and the public-facing gov.uk pages are the primary first-line guidance [SC2].

What is the UK tax year and the filing deadline?

The UK personal tax year runs 6 April to the following 5 April — a fiscal year, not a calendar year. The 2025/26 tax year covers 6 April 2025 to 5 April 2026. Filers in Self Assessment must submit a paper return by 31 October following the end of the tax year, or an online return by 31 January [SC3]. Tax due for the year is also payable by 31 January, with a balancing payment plus the first Payments on Account for the next year. Second Payment on Account is due 31 July. Companies file Corporation Tax returns within 12 months of the end of their accounting period and pay tax 9 months and 1 day after period-end (or in instalments if the company is large). VAT-registered businesses generally file VAT returns quarterly, with payment due one calendar month plus 7 days after the period-end. Penalties for late Self Assessment filing start at GBP 100 immediately, with escalation if delay extends beyond three months [SC1].

How is UK tax residency determined?

From 6 April 2013, UK residency is determined by the Statutory Residence Test (SRT), set out in Schedule 45 of the Finance Act 2013. The SRT works through three steps: an Automatic Overseas Test (which conclusively makes a person non-resident for the year — for example, present in the UK fewer than 16 days where the person was UK-resident in any of the prior three tax years); an Automatic UK Test (which conclusively makes a person resident — for example, present 183 days or more in the UK in the tax year); and, if neither set is conclusive, the Sufficient Ties Test, which counts UK ties (family, accommodation, work, 90-day, country tie) against day-count thresholds [SC5]. The remittance basis under the historical non-domiciled regime was substantially restricted from 6 April 2025 by reforms announced in 2024 — the Foreign Income and Gains regime now provides a four-year exemption for new arrivals to the UK rather than the indefinite non-dom basis. Practitioners should check current Finance Act provisions for the cut-over rules [SC8].

How does UK personal income tax work?

Income Tax in England, Wales, and Northern Ireland for 2025/26 is structured as a Personal Allowance of GBP 12,570 (frozen since 2021/22 through 2027/28), followed by a Basic Rate band of 20 percent on income up to GBP 50,270, a Higher Rate of 40 percent up to GBP 125,140, and an Additional Rate of 45 percent above GBP 125,140 [SC4][SC5]. The Personal Allowance is reduced by GBP 1 for every GBP 2 of adjusted net income above GBP 100,000, fully tapering away at GBP 125,140. Scotland operates its own Income Tax bands on non-savings non-dividend income — Starter (19 percent), Basic (20 percent), Intermediate (21 percent), Higher (42 percent), Advanced (45 percent), and Top (48 percent) for 2025/26 — set by the Scottish Parliament [SC5].

Dividend income above the GBP 500 Dividend Allowance is taxed at 8.75 percent (basic), 33.75 percent (higher), and 39.35 percent (additional) for 2025/26 [SC4]. Savings income benefits from a Personal Savings Allowance (GBP 1,000 for basic-rate, GBP 500 for higher-rate, nil for additional-rate filers). Capital Gains Tax has been progressively rationalised: from October 2024, the main rates moved to 18 percent (basic-rate band) and 24 percent (higher-rate band) for non-residential gains, with separate rates for residential property and Business Asset Disposal Relief.

How does UK corporate tax work?

The main rate of Corporation Tax is 25 percent for taxable profits from 1 April 2023, applying to companies with taxable profits above GBP 250,000 [SC4]. A Small Profits Rate of 19 percent applies to companies with profits up to GBP 50,000, with marginal relief tapering between the two thresholds for profits in between. Diverted Profits Tax, the Bank Surcharge, and the Energy Profits Levy operate as separate regimes on top of the main rate. The R&D regime was substantially restructured from 1 April 2024, merging the SME and RDEC schemes into a single regime for most companies, with an Enhanced R&D Intensive Support scheme for loss-making R&D-intensive SMEs. The UK has been an early implementer of the OECD Pillar Two Global Anti-Base Erosion (GloBE) rules: the Multinational Top-up Tax and Domestic Top-up Tax apply for accounting periods beginning on or after 31 December 2023 for groups with global revenue above EUR 750 million [SC5].

How does indirect tax work in the United Kingdom?

Value Added Tax is the UK's principal indirect tax, with a standard rate of 20 percent, a reduced rate of 5 percent (domestic fuel and power, children's car seats, mobility aids), and a zero rate (most food, books and newspapers, children's clothing, public transport) [SC4]. The mandatory VAT registration threshold rose to GBP 90,000 of taxable turnover from 1 April 2024. Making Tax Digital for VAT is mandatory for all VAT-registered businesses. Excise duties apply on alcohol, tobacco, and fuel; insurance premium tax applies on most general insurance; the Plastic Packaging Tax has applied since April 2022 to plastic packaging containing less than 30 percent recycled content. Stamp Duty Land Tax applies on land transactions in England and Northern Ireland; Scotland and Wales operate equivalent devolved taxes [SC2].

How is crypto taxed in the United Kingdom?

HMRC treats cryptoassets as property for tax purposes; the position is set out in detail in HMRC's Cryptoassets Manual [SC2]. For most individuals, gains on disposal of cryptoassets are subject to Capital Gains Tax under the share-pooling rules — assets of the same type are pooled and disposals matched against the pool's average cost. The Annual Exempt Amount was reduced to GBP 3,000 from 2024/25 [SC4], substantially below earlier years. Receipt of cryptoassets as employment income, mining rewards, or staking rewards is taxable as ordinary income at fair market value on receipt; that value forms the acquisition cost for any later disposal. Trading in cryptoassets at a level that constitutes a trade is rare for individuals and would instead be subject to Income Tax. Decentralised Finance (DeFi) lending and staking guidance was updated in 2022 and 2024; the position on whether a beneficial-ownership change occurs at the moment of lending or staking determines whether a CGT disposal arises [SC2].

How does the United Kingdom handle tax treaties?

The United Kingdom maintains one of the largest treaty networks in the world, with approximately 130 comprehensive Double Taxation Agreements in force, plus a number of Tax Information Exchange Agreements [SC5]. Most UK treaties follow the OECD Model Tax Convention with UK-specific modifications. Treaty relief from UK tax is generally claimed through the Self Assessment process or via PAYE coding for non-residents working in the UK. Where a UK resident has been taxed in another jurisdiction, double-taxation relief is given either by treaty (commonly the credit method) or by domestic Unilateral Relief under TIOPA 2010 where no treaty applies. The UK has signed and ratified the OECD Multilateral Instrument (MLI), which has modified the operation of many of its treaties without bilateral renegotiation; the MLI introduces a Principal Purpose Test for treaty access, anti-abuse provisions, and updated permanent-establishment definitions [SC8].

What are the common penalties and pitfalls for foreigners?

Late Self Assessment filing carries an immediate GBP 100 penalty even where no tax is owed; daily penalties of GBP 10 (max GBP 900) apply once the return is more than three months late; further fixed and tax-geared penalties apply at six and twelve months [SC1]. Late payment carries interest at HMRC's published rate plus surcharge penalties at 5 percent of unpaid tax at 30 days, six months, and twelve months. Penalties for inaccurate returns range from 0 to 100 percent of the tax under-declared depending on whether the inaccuracy was careless, deliberate, or deliberate-and-concealed, with reductions for unprompted disclosure.

Common pitfalls for arrivals to the UK include: misunderstanding the cut-over from the historical non-dom regime to the Foreign Income and Gains regime in April 2025; failing to register for Self Assessment within the statutory deadlines after first becoming chargeable; treating a US-source pension or 401(k) as untaxed in the UK when treaty rules and HMRC's lump-sum guidance can apply; and missing the Statutory Residence Test edge cases on split-year treatment, where the year of arrival or departure can be split between resident and non-resident periods. For complex cross-border situations, common approaches discussed by practitioners include reviewing the SRT day-count working alongside a credentialed tax pro before relying on a residency determination.