United Kingdom

Overview

Despite Brexit and significant tax reform in recent years, the United Kingdom remains one of the world's premier jurisdictions for company formation, financial services regulation, and commercial law. London is the largest financial centre in Europe and one of the two or three most significant globally, offering unmatched depth in capital markets, private equity, asset management, insurance, and professional services. For international businesses and investors, the UK continues to offer a compelling mix of common law flexibility, sophisticated banking infrastructure, a mature regulatory framework, and a corporate tax regime with several valuable reliefs and exemptions.

The major caveat for individual planning is the significant reform of the UK's non-domicile regime in 2025, which has fundamentally altered the UK's attractiveness as a personal tax domicile for internationally mobile high-net-worth individuals. Structures and residency plans that relied on the remittance basis require thorough re-evaluation.

Companies House and Company Formation

UK company incorporation through Companies House is among the fastest and cheapest in the world. A private limited company (Ltd) can be incorporated online in under 24 hours for £12 via Companies House's web incorporation service. There is no minimum share capital requirement for a private company.

The Limited Liability Partnership (LLP) is a transparent entity for tax purposes — income and gains are allocated to members and taxed at their individual or corporate level — making it widely used by law firms, accountancy practices, fund management businesses, and property investment structures. LLPs combine the partnership tax transparency with limited liability for all members.

The Public Limited Company (PLC) requires at least £50,000 of share capital (25% paid up) and is required for Stock Exchange listings and certain regulated activities.

Corporation Tax

The UK's corporation tax rate is 25% for companies with profits above £250,000 (from April 2023), with a small profits rate of 19% for companies with profits under £50,000, and marginal relief applying between the two thresholds. For groups with aggregated profits below the small profits threshold, the 19% rate applies across the group.

Key reliefs and exemptions:

• Substantial Shareholding Exemption (SSE): Gains on disposals of shares in qualifying subsidiary companies are fully exempt from UK corporation tax, provided the seller has held at least 10% of the shares for a continuous period of 12 months within the preceding 6 years. The SSE is one of the UK's most commercially significant corporate tax exemptions and underpins the UK's effectiveness as a holding company jurisdiction for private equity and corporate groups.
• R&D Tax Credits: The UK offers a generous, reformed R&D relief regime (merged scheme from April 2024) providing enhanced deductions and payable credits for qualifying innovation expenditure. The main rate credit is 20% for profit-making companies.
• Creative Industry Reliefs: UK film, high-end television, animation, video games, and other creative industries benefit from enhanced expenditure credits (Audio-Visual Expenditure Credit / AVEC from January 2024), effective at rates up to 34% for qualifying UK spend in film and high-end TV.
• Patent Box: A 10% effective corporation tax rate applies to profits attributable to qualifying patented inventions.

EMI Share Option Scheme

The Enterprise Management Incentive (EMI) scheme is one of the most tax-efficient employee equity incentive structures available anywhere in the world. It allows qualifying SMEs (gross assets under £30 million, under 250 full-time equivalent employees) to grant options over shares with an exercise price equal to market value at grant, with no income tax on grant or exercise, and Capital Gains Tax at the Business Asset Disposal Relief rate of 10% on eventual disposal (up to a £1 million lifetime limit). For high-growth startups and SMEs, EMI is a powerful tool for attracting and retaining key talent.

Business Asset Disposal Relief

Business Asset Disposal Relief (BADR) — formerly Entrepreneurs' Relief — provides a 10% CGT rate on qualifying gains from the disposal of business assets, subject to a lifetime limit of £1 million. Qualifying disposals include shares in a personal company (held for at least 2 years, with at least 5% ordinary share ownership and voting rights), interests in partnerships, and certain business property. The relief is particularly valuable for founders and owner-managers crystallising value from the sale of a trading business.

FCA Regulation and Financial Services

The Financial Conduct Authority (FCA) regulates financial services firms conducting regulated activities in the UK, including investment management, fund distribution, payment services, and insurance mediation. An FCA authorisation provides a credible regulatory credential respected globally and, while no longer providing automatic EU passporting post-Brexit, the UK's regulatory framework retains strong mutual recognition in many international contexts.

The UK's common law system, the availability of experienced commercial and financial lawyers, and the depth of the London professional services market make it the preferred seat for international contracts, dispute resolution, and complex structured finance and M&A transactions.

Non-Dom Regime — Post-2025 Reform

The UK's historically beneficial non-domicile regime — under which non-domiciled UK residents could shelter overseas income and gains from UK tax on a remittance basis — was fundamentally reformed with effect from April 2025. The remittance basis has been replaced by a residence-based system, with new arrivals exempt from UK tax on foreign income and gains for the first four years of UK tax residence. After four years, worldwide income and gains become fully taxable. The new regime also includes sweeping changes to the treatment of offshore trusts settled by formerly non-domiciled individuals.

Individuals who previously relied on the non-dom regime for UK tax planning, and those considering UK residency for the first time, should take specialist advice on the new regime's transitional provisions and on whether the UK remains the optimal base given these changes.