How to use UK Income Tax Calculator
This UK income tax calculator estimates your total tax liability based on your annual income, filing status and tax year. Select from 2023/24, 2024/25, 2025/26 and 2026/27 tax years — each with frozen allowances and thresholds. The calculator shows your effective tax rate (total tax ÷ income), marginal rate (tax on your last pound), tax breakdown by bracket and National Insurance contributions. Covers England, Wales and Northern Ireland rates.
- Select your tax year (2023/24, 2024/25, 2025/26, or 2026/27) from the dropdown at the top.
- Enter your annual gross income (salary, wages, bonuses before deductions).
- Choose your filing status: Individual or Married/Civil Partnership.
- (Optional) Select your region for informational reference (England, Wales, Northern Ireland, or Scotland notes).
- Click Calculate to see your income tax, National Insurance, effective rate, marginal rate and take-home pay.
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How UK tax brackets work
The UK uses a progressive income tax system with four main bands (called "bands" not "brackets"). Each band applies only to income within that range, not your entire income. For example, someone earning £40,000 pays 0% on the first £12,570 (the Personal Allowance), and 20% on the remaining £27,430, totaling £5,486 in income tax — an effective rate of about 13.7%, not 20%. This progressive system ensures you only pay higher rates on income that falls into higher brackets.
| Income Band | Tax Rate | Cumulative Tax at End of Band |
|---|---|---|
| £0–£12,570 | 0% | £0 (Personal Allowance) |
| £12,570–£50,270 | 20% | £7,540 (Basic Rate) |
| £50,270–£125,140 | 40% | £37,432 (Higher Rate) |
| £125,140+ | 45% | Continues at 45% (Additional Rate) |
Personal Allowance and the higher earner taper
Everyone in the UK gets a Personal Allowance of £12,570 (2024/25 and 2025/26) — the amount you can earn with zero tax. However, for high earners, the allowance reduces. For every £2 of income above £100,000, your allowance shrinks by £1. At £125,140, the allowance is completely gone. This taper is important to understand: someone earning £100,000 loses some allowance, and someone earning £125,140 has no allowance left, so their entire income is taxed at 20% (basic), 40% (higher) or 45% (additional). This calculator shows the allowance but does not yet apply the taper in its simplified version.
National Insurance contributions
National Insurance (NI) is a separate mandatory contribution deducted from your pay, on top of income tax. For employees in 2024/25 and 2025/26: 8% is withheld on earnings between £12,570 and £50,270, and 2% on earnings above £50,270. There is no employee NI on earnings below £12,570. For example, someone earning £40,000 pays 8% NI on £27,430 (the amount between £12,570 and £40,000), which equals £2,194. Both income tax and NI reduce your take-home pay.
Effective versus marginal tax rate in the UK
Your effective tax rate is total tax (including NI) divided by total income — your true average rate across all earnings. Your marginal tax rate is the rate on your next pound of income, set by the highest band you touch. Someone earning £40,000 has an effective tax rate of about 20% (including both income tax and NI) but a marginal rate of 20% (since the next pound falls in the basic rate 20% band). Understanding this helps with decisions: if you can earn extra income, know that it will be taxed at your marginal rate, not your effective rate.
Differences between England, Wales, Northern Ireland and Scotland
Income tax rates are devolved in the UK. England, Wales and Northern Ireland use the same bands and rates (this calculator). Scotland has its own distinct progressive system with five bands: Starter 19%, Scottish Basic 20%, Intermediate 21%, Higher 41% and Top 46%. The thresholds also differ: in Scotland, the basic rate band extends to £25,296, not £50,270. Anyone resident in Scotland for tax purposes uses Scottish rates, which can result in higher tax for higher earners.
Worked examples
Individual, £40K income, 2024/25
Inputs: £40,000 gross income
Result: ~£5,486 income tax · ~£2,194 NI · 19% effective · 20% marginal
Individual, £60K income, 2024/25
Inputs: £60,000 income
Result: ~£11,432 income tax · ~£3,462 NI · 24.5% effective · 40% marginal
Individual, £100K income, 2024/25
Inputs: £100,000 income
Result: ~£37,432 income tax · ~£4,262 NI · 41.7% effective · 40% marginal
Glossary
- Tax band (or bracket)
- A range of income subject to a specific tax rate in the UK progressive system.
- Effective tax rate
- Total tax (including National Insurance) divided by total income — your true average tax rate.
- Marginal tax rate
- The tax rate applied to your next pound of income, set by the highest tax band you touch.
- Personal Allowance
- The amount of income you can earn tax-free in a tax year (£12,570 for 2024/25–2025/26).
- Taxable income
- Gross income minus the Personal Allowance, which is what income tax bands apply to.
- National Insurance
- A mandatory social contribution withheld from your pay (8% on most earnings, 2% on high earnings).
- Tax year
- In the UK, April 6 to April 5 of the following year (e.g., 2024/25 runs April 6, 2024 – April 5, 2025).
- Higher rate
- The 40% tax rate applied to income between £50,270 and £125,140 in 2024/25–2025/26.
- Additional rate
- The 45% tax rate applied to income above £125,140 in 2024/25–2025/26.
Related reading
Frequently Asked Questions
Why use UK Income Tax Calculator?
- Compare tax liability across multiple years (2023/24–2026/27) to see frozen allowances and stable thresholds
- See your effective rate (actual tax ÷ income) and marginal rate (tax on your last pound of earnings)
- Full breakdown by tax bracket shows exactly how much of your income is taxed at each rate (0%, 20%, 40%, 45%)
- Includes mandatory National Insurance contributions (8% and 2% bands) with employee threshold protection
- Understand your Personal Allowance (£12,570) and how it tapers away for high earners above £100,000
Common use cases
- Estimate your UK income tax liability and take-home pay before the tax year or when changing jobs
- Understand your effective vs. marginal tax rate to make informed decisions about additional income
- Check if you will enter the higher rate (40%) or additional rate (45%) tax band at your income level
- Plan how National Insurance contributions affect your net pay alongside income tax
- Calculate historical tax liability for prior years (2023/24–2026/27) if amending a return
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