How to Reduce Income Tax in the UK
A clear, practical guide to the legal allowances and reliefs available for the 2026/27 tax year — from pension contributions and ISAs to Marriage Allowance and salary sacrifice.
Your Tax-Saving Roadmap
Reducing your Income Tax bill legally is mostly about using the allowances and reliefs you’re already entitled to, before they’re lost at the end of the tax year. Work through this roadmap to see where your biggest opportunities are.
Six Ways to Pay Less Tax
The most effective, widely available reliefs
Maximise Pension Contributions
Every pound paid into a pension attracts tax relief at your marginal rate, and reduces your taxable income for the year. Higher and additional rate taxpayers often need to claim the extra relief above 20% through Self Assessment.
Use Your Full ISA Allowance
Interest, dividends, and gains inside an ISA are never taxed. Using your allowance each year, rather than leaving cash in a taxable account, keeps future growth outside the tax system entirely.
Claim Marriage Allowance
If one partner earns below the Personal Allowance and the other is a basic rate taxpayer, up to £1,260 of unused allowance can be transferred between them, and the claim can be backdated up to four years.
Use Salary Sacrifice
Exchanging salary for pension contributions, cycle-to-work schemes, or childcare support reduces taxable income and, in many cases, National Insurance for both employee and employer.
Claim Gift Aid and Work Expenses
Gift Aid donations extend your basic rate band, giving higher and additional rate taxpayers extra relief they must actively claim. Legitimate work expenses, such as professional subscriptions or working-from-home costs, can also be claimed.
Protect Your Personal Allowance
Between £100,000 and £125,140 of adjusted net income, the Personal Allowance is withdrawn at £1 for every £2 earned, creating an effective marginal rate of around 60%. Pension contributions or Gift Aid can bring income back under the threshold.
Tax-Saving Checklist
Review these before the tax year ends on 5 April
Key Allowances for 2026/27
A summary of the main UK tax-free allowances to build your tax-saving plan around this year.
| Allowance | What It Covers | 2026/27 Limit |
|---|---|---|
| Personal Allowance | Income you can earn before Income Tax applies | £12,570 |
| ISA Allowance | Tax-free saving and investing across all ISA types | £20,000 |
| Pension Annual Allowance | Contributions eligible for tax relief each year | £60,000 |
| Dividend Allowance | Dividend income before Dividend Tax applies | £500 |
| Personal Savings Allowance | Savings interest tax-free (basic / higher rate) | £1,000 / £500 |
| Capital Gains Tax Exempt Amount | Gains on assets before CGT applies | £3,000 |
| Marriage Allowance | Personal Allowance transferable between partners | £1,260 (saves up to £252) |
Reducing Income Tax FAQ
Answers to the most frequently asked questions about reducing Income Tax in the UK.
For most people, increasing pension contributions is the simplest way to reduce Income Tax, since contributions attract tax relief at your marginal rate and reduce your taxable income immediately.
Once adjusted net income passes £100,000, the Personal Allowance is reduced by £1 for every £2 earned above that threshold, creating an effective marginal tax rate of around 60% until the allowance is fully lost at £125,140. Pension contributions or Gift Aid donations can reduce adjusted net income and help preserve the allowance.
Yes. Interest, dividends, and capital gains earned inside an ISA are completely free of Income Tax and Capital Gains Tax, so using your full annual ISA allowance keeps future investment growth outside the tax system entirely.
Salary sacrifice can reduce both Income Tax and National Insurance because the sacrificed amount never appears as taxable salary. It is particularly effective for pension contributions, where both employee and employer often save on National Insurance as well.