Income Tax UK 2025/26

Overview

Calculate Income Tax UK 2025/26 using the official rates and regulations for United Kingdom.

How it works

Enter the base amount and the calculator will apply the relevant rates and brackets to compute the result.

Understanding the UK Income Tax System

Income tax in the UK is a progressive tax levied on taxable income, which includes earnings from employment, self-employment profits, rental income, most pension income, and certain benefits. For the 2025-26 tax year, the personal allowance is £12,570, meaning the first £12,570 of income is tax-free. Income above this threshold is taxed at 20% in the basic rate band up to £50,270, 40% in the higher rate band up to £125,140, and 45% on income above £125,140. The personal allowance is reduced by £1 for every £2 of income above £100,000, creating an effective 60% marginal rate on income between £100,000 and £125,140 as the allowance tapers away. National Insurance is levied separately, adding 8% on earnings between £12,570 and £50,270 and 2% above that threshold for employees. The combined marginal rate for a basic-rate taxpayer earning between £12,570 and £50,270 is therefore 28%, while a higher-rate earner between £50,270 and £100,000 faces a combined 42% marginal rate. Understanding these bands and the interaction with National Insurance is essential for accurate take-home pay calculations and effective tax planning throughout the year.

Allowable Deductions and Tax Reliefs

Several deductions and reliefs can reduce your taxable income and overall tax liability. Pension contributions made through net pay arrangements reduce taxable income directly, while relief at source contributions receive basic rate top-up from the government with higher-rate relief claimed through Self Assessment. Gift Aid donations extend your basic rate band, meaning a £100 donation effectively costs a higher-rate taxpayer only £75 after tax relief. Professional subscriptions related to your employment, up to £500 in business mileage at 45p per mile for the first 10,000 miles, and work-from-home allowances are all legitimate deductions. Marriage Allowance permits transfer of 10% of the personal allowance between spouses where one earns below the personal allowance threshold, saving up to £252 per year. Blind person's allowance adds £3,070 to the personal allowance for registered blind individuals. Trading and property income allowances of £1,000 each provide tax-free thresholds for small-scale self-employment and rental income. Maximising these reliefs through proactive claims rather than relying on HMRC to apply them automatically ensures you retain as much of your earnings as legally possible.

Coding Notices and the PAYE System

Most employees pay income tax through the Pay As You Earn (PAYE) system, where employers deduct tax from wages before payment based on a tax code issued by HMRC. The standard tax code 1257L indicates the basic personal allowance of £12,570, with the L suffix confirming standard eligibility. Adjusted codes may include deductions for company car benefits, underpayments from previous years, or estimated non-PAYE income, as well as additions for certain expenses or flat-rate allowances. Your tax code appears on your payslip and can be checked through your Personal Tax Account on gov.uk. If you believe your code is incorrect, contacting HMRC promptly prevents accumulating overpaid or underpaid tax that must be reconciled at year-end. Scottish taxpayers have codes prefixed with S, Welsh taxpayers with C, and those with adjusted personal allowance may see codes with K prefix indicating deductions exceeding the allowance. Understanding your coding notice helps identify errors early and ensures the correct tax is deducted from each payment throughout the year.

Using Our UK Income Tax Calculator

Our income tax calculator provides a comprehensive breakdown of your tax and National Insurance liability based on your gross income, tax code, and pension contributions. Enter your salary or projected earnings to see exactly how much is deducted at each tax band, your effective tax rate, and your net take-home pay after all statutory deductions. The calculator handles the personal allowance taper for incomes above £100,000, showing the dramatic 60% marginal rate that applies in this income range. It also models the impact of salary sacrifice, pension contributions, student loan repayments, and other common deductions, helping you understand your true tax position and identify opportunities to reduce your liability through legitimate planning strategies.

Use our calculator to plan ahead, whether negotiating a salary offer, evaluating a promotion, or deciding between employment and self-employment, by showing you exactly what each option means for your net income after all statutory deductions.