UK Income Tax

About the UK Income Tax

The UK income tax calculator gives you an instant, accurate picture of your take-home pay for the 2025-26 tax year — the period running from 6 April 2025 to 5 April 2026. Whether you are a salaried employee on PAYE, a director taking a salary and dividends, a contractor comparing inside-IR35 versus outside-IR35 arrangements, or simply trying to understand how the Chancellor's Budget decisions affect your personal finances, this tool cuts through the complexity and delivers your net pay in seconds. Income tax in the United Kingdom is administered by HM Revenue and Customs (HMRC) and operates through a progressive banding system: you pay nothing on income below the Personal Allowance, 20% Basic Rate on the band above it, 40% Higher Rate on income above £50,270, and 45% Additional Rate on income above £125,140. Most employees never see this complexity because their employer handles it automatically through the PAYE (Pay As You Earn) system — but understanding the bands, and knowing which band your next pay rise will fall into, is critical information for financial planning. Our calculator also handles National Insurance Contributions (NICs), which are a second, parallel deduction from your gross pay. Class 1 employee NICs are charged at 8% on earnings between the Primary Threshold (£12,570) and the Upper Earnings Limit (£50,270), and at 2% on earnings above that. Notably, NIC does not operate through the same banding structure as income tax — there is no personal allowance equivalent, just a lower threshold below which no contributions are due. This means someone earning £50,000 pays NICs on £37,430 of income but income tax on only £37,430 (after the Personal Allowance). Adding both together reveals why the effective combined rate for many middle-income earners is considerably higher than just the headline 20% Basic Rate. The calculator also accounts for student loan repayments — you can select Plan 1, Plan 2 (post-2012 undergraduate loans), or Plan 5 (post-August 2023 undergraduates) — and for pension salary sacrifice contributions, which reduce your taxable income and therefore both your income tax and NIC bill simultaneously. If you live in Scotland, you can switch to Scottish Income Tax rates, which use a different five-band structure with a Starter Rate of 19%, Basic Rate of 20%, Intermediate Rate of 21%, Higher Rate of 42%, and Advanced Rate of 45%, plus a new Top Rate of 48% above £125,140. Scotland's NHS, education, and local services are partly funded through this separate rate-setting power devolved to the Scottish Parliament. The calculator also shows the taper of the Personal Allowance for high earners: above £100,000, your Personal Allowance reduces by £1 for every £2 of additional income. This creates an effective 60% marginal income tax rate on earnings between £100,000 and £125,140 — one of the most punishing marginal rate bands in the developed world — because not only are you paying 40% income tax but you are simultaneously losing allowance on which you would otherwise pay 40%. A £10,000 pay rise in this band generates a £6,000 tax bill: £4,000 of new 40% tax plus £2,000 of tax on the £5,000 of allowance lost. This effect disappears completely above £125,140 where the allowance is fully withdrawn. For pension planning, this makes salary sacrifice contributions in the £100k–£125,140 band extraordinarily efficient: every £1,000 of salary sacrifice recovers £600 in tax rather than the standard £200 (basic rate). Understanding your effective versus marginal rates is therefore not merely academic — it is the foundation of smart financial decisions around pension contributions, bonuses, salary sacrifice schemes, and investment choices. Results are presented with a monthly and weekly breakdown so you can match the figures to your actual pay schedule, and the band-by-band breakdown table shows exactly how your income tax is calculated across each rate band. We update tax rates, NIC thresholds, and student loan repayment thresholds every year on 6 April as soon as HMRC publishes the new figures.

How It Works

The UK income tax calculation for 2025-26 follows these steps. First, determine adjusted Personal Allowance: standard allowance is £12,570, but this tapers by £1 for every £2 above £100,000. For someone earning £110,000, the adjusted allowance is £12,570 minus £5,000 (half of the £10,000 above the threshold) = £7,570. Second, calculate taxable income: Gross Income minus Adjusted Personal Allowance minus any salary sacrifice pension contributions. Third, apply progressive rates to taxable income: 20% on the first £37,700 (the Basic Rate band, which runs from £12,570 to £50,270 in gross terms), 40% on the next £74,870 (£50,270 to £125,140), and 45% on anything above. Worked example: £65,000 gross salary, England, no pension, no student loan. Taxable income = £65,000 minus £12,570 = £52,430. Basic Rate tax = £37,700 x 20% = £7,540. Higher Rate tax = (£52,430 minus £37,700) x 40% = £14,730 x 40% = £5,892. Total income tax = £13,432. NIC: 8% on (£50,270 minus £12,570) = £37,700 x 8% = £3,016. Plus 2% on (£65,000 minus £50,270) = £14,730 x 2% = £295. Total NIC = £3,311. Total deductions = £16,743. Take-home = £48,257/year = £4,021/month.

Tips & Best Practices

• ✓Salary sacrifice pension contributions are the single most tax-efficient action available to most UK employees — they reduce both income tax AND National Insurance simultaneously, meaning a basic-rate taxpayer effectively saves 28p in tax for every £1 contributed, while a higher-rate taxpayer saves 42p in the pound.
• ✓If your income is between £100,000 and £125,140 you face an effective 60% marginal tax rate due to Personal Allowance tapering. Every £1,000 salary sacrifice in this range saves you £600 in tax — the most powerful pension contribution window in the UK tax system.
• ✓The tax year runs 6 April to 5 April. If you start a new job part way through the year, HMRC may have collected too little or too much tax depending on your tax code — always check your P60 at year end against this calculator to identify refunds.
• ✓Marriage Allowance lets a non-taxpayer (or basic-rate taxpayer) transfer £1,260 of their Personal Allowance to their spouse or civil partner, saving up to £252 per year in income tax. This is particularly valuable when one partner earns below £12,570.
• ✓National Insurance gaps affect your State Pension entitlement — you need 35 qualifying years for the full new State Pension (£221.20/week in 2025-26). Voluntary Class 3 NIC contributions cost £17.45/week to fill gaps and typically pay back within 3-4 years of reaching state pension age.
• ✓Employers do not deduct income tax on the first £12,570 due to the Personal Allowance, but they DO still deduct NIC from the first pound above the Primary Threshold. This catches many employees by surprise who assume no deductions apply below the income tax threshold.
• ✓If you have multiple jobs or pension income, HMRC assigns your Personal Allowance to your main job. Secondary employment is taxed at Basic or Higher Rate from the first pound — use HMRC's online tax code checker if your P45 situation is unusual.
• ✓The tax-free dividend allowance (£500 in 2025-26) is separate from the Personal Allowance and is important for company directors who supplement salary with dividends — dividends above this allowance are taxed at 8.75% (basic), 33.75% (higher), or 39.35% (additional rate).

Who Uses This Calculator

Employees use the UK income tax calculator when they receive a job offer to understand their real take-home pay rather than the headline salary figure, which is critical when comparing offers in different bands where the marginal rates differ substantially. Workers considering overtime or a second job use it to discover which tax band their additional earnings fall into — someone already earning £49,000 will find that all additional income is taxed at 47.5% combined (40% income tax plus 2% NIC plus 5% NIC on the band just below), whereas someone earning £30,000 faces only 28% combined. Pension savers model the impact of increasing pension contributions, particularly if they earn between £100,000 and £125,140 where the 60% effective marginal rate makes pension contributions exceptionally tax-efficient. Contractors use the calculator to compare the net income difference between PAYE employment (inside IR35) and self-employment (Class 2 and Class 4 NICs instead of Class 1). New UK residents or international employees relocating to the UK use the calculator to understand how the UK tax system differs from their home country — particularly the combination of income tax and NIC which is often unfamiliar to arrivals from countries where there is only a single income tax. University graduates starting employment use the Plan 2 or Plan 5 student loan option to understand the full extent of their deductions before their first payslip arrives. Scottish taxpayers check the Scottish rate toggle to see whether the different banding structure creates a higher or lower liability than the equivalent English rate — an important comparison for those who move between Scotland and England for work.