How to Pay Less Tax Legally in the UK

Reducing your tax bill is entirely legal — provided you use legitimate reliefs and allowances rather than artificial avoidance schemes. HMRC distinguishes between tax avoidance (exploiting loopholes, often challenged by HMRC) and tax planning (using the system as Parliament intended). This guide covers practical, HMRC-approved strategies for UK individuals and small business owners.

Maximise Pension Contributions

Pension contributions are one of the most powerful tax planning tools available. For every £800 contributed to a pension from net income, basic rate tax relief adds £200, making it £1,000 in the fund. Higher rate taxpayers can claim an additional 20% via Self-Assessment, and additional rate taxpayers an extra 25%. The annual allowance is £60,000 (or 100% of relevant earnings if lower) for 2025/26. Contributions also reduce your Adjusted Net Income, which determines whether you fall into the 40% or 60% effective tax zones. Contributing to bring income below £100,000 restores your Personal Allowance, which can be worth up to £5,028 in tax savings.

Use Your ISA Allowance

Each tax year you can invest up to £20,000 in an Individual Savings Account. ISA returns — interest, dividends, and capital gains — are completely tax-free both now and in the future. Stocks and Shares ISAs are suitable for long-term investment; Cash ISAs suit those who need liquidity. ISAs do not reduce your current year's tax bill, but shelter future growth.

Salary Sacrifice

If you are employed, ask your employer about salary sacrifice arrangements. By taking a lower salary in exchange for employer pension contributions, both you and your employer avoid National Insurance on the sacrificed amount. The NI saving for a higher rate employee is substantial: 2% for the employee plus 13.8% for the employer, which many employers pass back to you.

Claim All Allowable Expenses

Self-employed people who fail to claim all legitimate business expenses are overpaying tax. Review your expenditure annually: home working costs, vehicle mileage, professional subscriptions, training, equipment, and any costs specific to your trade. Employees can also claim expenses not reimbursed by their employer through form P87 (for amounts under £2,500) or Self-Assessment.

Transfer Income-Producing Assets to a Spouse

Transfers between spouses and civil partners are exempt from Capital Gains Tax. If one spouse is a lower-rate taxpayer, transferring income-generating assets (rental property, shares, savings accounts) to them means that income is taxed at a lower rate or not at all if it falls within their Personal Allowance. The Marriage Allowance also allows a non-taxpaying spouse to transfer £1,260 of Personal Allowance to their partner — saving up to £252 per year.

Gift Aid

Charitable donations made via Gift Aid extend your basic rate band by the grossed-up donation amount, pulling more income into the 20% rather than 40% band. A £800 donation costs you £800 but the charity receives £1,000, and a higher rate taxpayer reclaims £200 through Self-Assessment.

Use the Annual Investment Allowance

Businesses can deduct the full cost of qualifying plant and machinery up to £1 million per year through the AIA. This is powerful for reducing corporation tax or self-employment tax if you have significant equipment purchases planned.

Time Income and Gains

If you have control over when you receive income — for example as a director paying yourself dividends — consider spreading income across tax years to avoid pushing into a higher rate band in any single year. Similarly, realising capital gains can be timed to use the Annual Exempt Amount (£3,000 for 2025/26) each year rather than triggering a large gain in one year.

Director Salary and Dividend Strategy

Limited company directors can structure remuneration to minimise tax by taking a small salary (up to the NI threshold, around £9,100 in 2025/26) and extracting remaining profits as dividends, which are taxed at lower rates and attract no NI. Take care that the strategy remains appropriate as dividend tax rates have increased significantly since 2016.

Venture Capital Schemes

The Seed Enterprise Investment Scheme (SEIS) offers 50% income tax relief on investments up to £200,000 in qualifying early-stage companies. The Enterprise Investment Scheme (EIS) offers 30% relief up to £1 million. These are high-risk investments but provide generous tax incentives approved by HMRC.