Wondering how much income tax you owe in 2025/26? The UK system uses progressive tax bands — meaning the rate you pay depends on how much you earn, not just which band you fall into. This guide explains exactly how income tax is calculated, with real step-by-step examples so you can work it out yourself.
Want your answer in seconds? Use our free UK Salary Tax Calculator — no signup required.
How UK Income Tax Works
The UK uses a progressive tax system. This means:
- • You do not pay the same rate on your entire income
- • Each portion of your income is taxed at a different rate
- • Earning more money never reduces your take-home pay
Think of your income as being sliced into layers. Each layer sits in a different tax band and is taxed at that band's rate — and only that rate.
Step 1 — Know Your Personal Allowance
Before any tax is calculated, you subtract your Personal Allowance — the amount you can earn completely tax-free each year.
For 2025/26, the standard Personal Allowance is £12,570.
- • Earn £12,570 or less → pay zero income tax
- • Earn more than £12,570 → only pay tax on the amount above £12,570
- • Earn over £100,000 → your Personal Allowance is gradually reduced
- • Earn £125,140 or more → your Personal Allowance disappears entirely
💡 The Personal Allowance has been frozen at £12,570 since 2021/22 and is set to stay at this level until at least 2030/31. As wages rise, more people are being pulled into higher tax bands — this is known as fiscal drag.
Step 2 — The UK Income Tax Bands for 2025/26
Once you've subtracted your Personal Allowance, the remaining income (your taxable income) is split across these bands:
England, Wales and Northern Ireland
| Band | Taxable Income | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 – £50,270 | 20% |
| Higher Rate | £50,271 – £125,140 | 40% |
| Additional Rate | Over £125,140 | 45% |
Scotland — Different Rates Apply
Scotland has its own income tax system with six bands for 2025/26:
| Band | Taxable Income | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Starter Rate | £12,571 – £15,397 | 19% |
| Basic Rate | £15,398 – £27,491 | 20% |
| Intermediate Rate | £27,492 – £43,662 | 21% |
| Higher Rate | £43,663 – £75,000 | 42% |
| Advanced Rate | £75,001 – £125,140 | 45% |
| Top Rate | Over £125,140 | 48% |
Scottish taxpayers pay slightly less tax on lower incomes (due to the 19% Starter Rate) but generally pay more on incomes above around £28,000.
Step 3 — Calculate Your Tax Band by Band
Here's the key point most people misunderstand: you never pay a higher rate on your full income. You only pay each rate on the portion of income that falls within that band.
Worked Example 1 — £28,000 salary (England)
| Step | Calculation | Tax |
|---|---|---|
| Personal Allowance | £12,570 → 0% | £0 |
| Basic Rate | £28,000 − £12,570 = £15,430 → 20% | £3,086 |
| Total income tax | £3,086 | |
| Monthly tax | £3,086 ÷ 12 | £257/month |
Worked Example 2 — £55,000 salary (England)
| Step | Calculation | Tax |
|---|---|---|
| Personal Allowance | £12,570 → 0% | £0 |
| Basic Rate | £50,270 − £12,570 = £37,700 → 20% | £7,540 |
| Higher Rate | £55,000 − £50,270 = £4,730 → 40% | £1,892 |
| Total income tax | £9,432 | |
| Monthly tax | £9,432 ÷ 12 | £786/month |
Notice how only £4,730 is taxed at 40% — not the full £55,000. This is exactly how progressive taxation works.
Worked Example 3 — £80,000 salary (England)
| Step | Calculation | Tax |
|---|---|---|
| Personal Allowance | £12,570 → 0% | £0 |
| Basic Rate | £37,700 → 20% | £7,540 |
| Higher Rate | £80,000 − £50,270 = £29,730 → 40% | £11,892 |
| Total income tax | £19,432 | |
| Monthly tax | £19,432 ÷ 12 | £1,619/month |
Quick Reference: Income Tax at Common Salaries (England 2025/26)
| Gross Salary | Income Tax Paid | Effective Tax Rate |
|---|---|---|
| £15,000 | £486 | 3.2% |
| £20,000 | £1,486 | 7.4% |
| £25,000 | £2,486 | 9.9% |
| £30,000 | £3,486 | 11.6% |
| £40,000 | £5,486 | 13.7% |
| £50,000 | £7,486 | 15.0% |
| £60,000 | £11,432 | 19.1% |
| £80,000 | £19,432 | 24.3% |
| £100,000 | £27,432 | 27.4% |
🧮 For your exact figures including National Insurance and pension, use our free Salary Tax Calculator.
The £100,000 Tax Trap — What Is It?
If your income is between £100,000 and £125,140, something unusual happens: your Personal Allowance starts to disappear.
For every £2 you earn above £100,000, you lose £1 of your Personal Allowance. By the time you reach £125,140, your Personal Allowance has been reduced to zero.
This creates an effective marginal tax rate of around 60% in this income range — meaning for every extra £100 you earn between £100,000 and £125,140, you keep just £40.
- • Earn £100,000 → pay tax as normal with full £12,570 allowance
- • Earn £110,000 → Personal Allowance reduced to £7,570 → pay an extra ~£2,000 in tax
- • Earn £125,140 → Personal Allowance = £0 → effective rate peaks at ~60%
This is why many higher earners choose to make additional pension contributions to bring their income below £100,000 and preserve their full Personal Allowance.
What Is Effective Tax Rate vs Marginal Tax Rate?
Marginal tax rate
The rate you pay on your next pound of income. If you earn £51,000, your marginal rate is 40% (you're just into the Higher Rate band).
Effective tax rate
The actual percentage of your total income paid in tax. On a £51,000 salary, your effective rate is around 15–16%, because most of your income is taxed at 20% or 0%.
This is why it's misleading to say "I'm a 40% taxpayer" — very few people pay 40% of their entire salary in income tax.
What About Tax Codes?
Your tax code tells your employer how much of your income is tax-free. The standard code for 2025/26 is 1257L, which corresponds to the £12,570 Personal Allowance.
If your tax code is different — for example, if you have benefits in kind (like a company car) or unpaid tax from a previous year — your effective tax-free amount will be different. You can check and update your tax code via your Personal Tax Account on gov.uk.
| Tax Code | Meaning |
|---|---|
| 1257L | Standard — £12,570 Personal Allowance |
| BR | All income taxed at basic rate (20%) — no allowance |
| D0 | All income taxed at higher rate (40%) |
| NT | No tax deducted |
| K code | Negative allowance — extra tax owed |
How to Reduce Your Income Tax Legally
Pension contributions
Money paid into a pension reduces your taxable income pound for pound. If you're a higher rate taxpayer, you get 40% tax relief on contributions.
Gift Aid donations
Charitable donations made through Gift Aid extend your basic rate band, which can be useful if you're close to the higher rate threshold.
Marriage Allowance
If your partner earns less than £12,570, they can transfer up to £1,260 of their unused Personal Allowance to you — saving up to £252 per year.
Salary sacrifice
Arrangements where you give up part of your salary in exchange for benefits (like a pension, childcare vouchers or an electric car) reduce your taxable income.
ISA contributions
Income and gains inside an ISA are completely tax-free. The ISA allowance is £20,000 per year for 2025/26.
Calculate Your Income Tax in Seconds
Rather than working through the maths yourself, use our UK Salary Tax Calculator to get a full breakdown instantly — income tax, National Insurance, student loan, pension, and monthly take-home pay.
Summary — UK Income Tax 2025/26 at a Glance
| 2025/26 | Amount / Rate |
|---|---|
| Personal Allowance | £12,570 |
| Basic Rate (20%) | £12,571 – £50,270 |
| Higher Rate (40%) | £50,271 – £125,140 |
| Additional Rate (45%) | Over £125,140 |
| Allowance taper starts | £100,000 |
| Allowance fully withdrawn | £125,140 |
| Tax year | 6 April 2025 – 5 April 2026 |
Frequently Asked Questions
How much income tax do I pay on £30,000 in the UK?
On a £30,000 salary in England (2025/26), you pay £3,486 in income tax — that's 20% on £17,430 (the amount above your £12,570 Personal Allowance).
What is the income tax rate in the UK for 2025/26?
The basic rate is 20%, the higher rate is 40%, and the additional rate is 45%. Scotland has different rates ranging from 19% to 48%.
Do I pay tax on my full salary?
No. You never pay income tax on your full salary. The first £12,570 is always tax-free (assuming a standard tax code), and each rate only applies to the income within that band.
What is the tax-free allowance for 2025/26?
The standard Personal Allowance is £12,570 for 2025/26. This has been frozen since 2021/22.
All figures are based on official HMRC and UK Government data for the 2025/26 tax year (6 April 2025 – 5 April 2026). Scotland rates sourced from the Scottish Government. Tax rules can change — always verify at gov.uk/income-tax-rates.