UK income tax works on a graduated band system: different portions of your income are taxed at different rates. For 2026/27, the four bands are 0%, 20%, 40% and 45% — but the real story is the 60% effective trap at £100k and Scotland's different rates.
How UK income tax bands work
You do not pay a single rate on your total income. UK income tax is applied in slices — different portions of your earnings attract different rates as your income rises. For 2026/27, the bands for England, Wales and Northern Ireland are:
| Band | Rate | 2026/27 threshold | Width |
|---|---|---|---|
| Personal Allowance | 0% | £0 – £12,570 | £12,570 |
| Basic rate | 20% | £12,571 – £50,270 | £37,700 |
| Higher rate | 40% | £50,271 – £125,140 | £74,870 |
| Additional rate | 45% | Above £125,140 | No upper limit |
So if you earn £60,000 in 2026/27:
- First £12,570 — 0% tax = £0
- Next £37,700 (between £12,571 and £50,270) — 20% tax = £7,540
- Final £9,730 (between £50,271 and £60,000) — 40% tax = £3,892
- Total income tax: £11,432 — an effective rate of 19% despite being in the "40% band"
This is why "40% taxpayer" is misleading. Very few higher-rate taxpayers actually pay 40% of their income in tax. The marginal rate is 40%, but the effective rate is much lower.
The 60% effective trap — the UK's highest marginal rate
The surprising truth about UK income tax: the highest effective marginal rate is not 45%. It's 60%, and it applies in a specific income zone that catches hundreds of thousands of senior professionals.
Between £100,000 and £125,140, your Personal Allowance tapers. For every £2 you earn above £100,000, you lose £1 of your £12,570 Personal Allowance.
The effect is brutal:
- Every extra £1 earned in this zone attracts 40% income tax
- PLUS you lose 50p of Personal Allowance — which was tax-free — so you pay an additional 20p of tax on allowance that was previously yours
- Net effect: you keep 40p of every extra £1 earned
This is 60% effective marginal rate — higher than the 45% additional rate above £125,140.
The trap affects roughly 1.2 million UK earners according to HMRC data, most of them senior professionals whose pay has drifted into the zone over the last 15 years while the £100,000 threshold has remained frozen.
Scotland has different rates
Scottish taxpayers pay Scottish income tax on earned income (employment, self-employment, pensions). UK-wide rates still apply to savings interest and dividends. For 2026/27, Scotland runs five rates:
| Scottish band | Rate | Threshold |
|---|---|---|
| Personal Allowance | 0% | £0 – £12,570 |
| Starter rate | 19% | £12,571 – £15,397 |
| Basic rate | 20% | £15,398 – £27,491 |
| Intermediate rate | 21% | £27,492 – £43,662 |
| Higher rate | 42% | £43,663 – £75,000 |
| Advanced rate | 45% | £75,001 – £125,140 |
| Top rate | 48% | Above £125,140 |
Key differences:
- Scotland's higher rate starts at £43,663 (vs £50,270 in rUK) — a lower threshold
- Scotland's higher rate is 42% (vs 40% in rUK) — 2 percentage points higher
- Scotland has an "advanced rate" of 45% between £75k and £125k that doesn't exist in rUK
- Scotland's top rate is 48% (vs 45% in rUK)
A Scottish earner on £60,000 pays roughly £1,000 more income tax than an equivalent rUK earner.
What the 20% basic rate actually costs
For most UK earners, the 20% basic rate is the main tax they'll face. Combined with 8% National Insurance between £12,570 and £50,270, the effective marginal rate on basic-rate earnings is 28%.
So for every £100 of pay rise within the basic-rate band, you keep £72 after tax and NI. That's a better deal than higher earners — they keep £58 of each £100 (40% tax + 2% NI), or just £40 of each £100 in the 60% trap zone.
Why the higher-rate threshold feels so low
When the higher-rate threshold of £50,270 was set in 2021, the average full-time UK salary was £31,772. Today the median full-time UK salary is approximately £37,430 — still below the threshold. But the threshold hasn't moved in 5 years, and fiscal drag means more professional-grade roles now cross the £50,270 line.
HMRC expects approximately 6.1 million UK taxpayers to be in the higher-rate band by 2027/28, up from around 3 million in 2010. This is not because the UK got richer. It's because the threshold didn't rise with wages.
The additional rate: who actually pays 45%
The 45% additional rate kicks in at £125,140. In 2024/25, approximately 750,000 UK taxpayers paid at this rate, according to HMRC data. That's less than 2% of UK adults.
But here's the paradox: someone earning £125,000 (inside the 60% trap) pays a higher marginal rate than someone earning £200,000 (in the 45% additional band). The additional rate is mathematically lower than the taper rate immediately below it.
How much income tax will I pay?
The fastest way to see your exact income tax bill is our UK Income Tax Calculator. Enter your salary, pick your region (Scotland or England/Wales/NI), and see:
- Income tax (by band)
- National Insurance
- Take-home pay (monthly and annual)
- Effective vs marginal rate
Reducing your income tax legally
Several structural reductions are available:
Pension contributions
Workplace or personal pension contributions receive tax relief at your marginal rate. A £100 gross pension contribution costs a basic-rate taxpayer £80, a higher-rate taxpayer £60, and a 60% trap taxpayer just £40. Pension contributions also reduce your adjusted net income, which can pull you out of the £100k taper zone.
Salary sacrifice
Arrangements where you give up salary in exchange for non-cash benefits (pension contributions, cycle-to-work, childcare, EVs) reduce your gross pay — and therefore your tax and NI.
Charitable giving
Gift Aid donations allow charities to claim back basic-rate tax. Higher-rate and additional-rate taxpayers can claim the difference between their rate and basic rate via self-assessment.
Marriage Allowance
If one partner earns less than the Personal Allowance and the other is a basic-rate taxpayer, up to £1,260 of allowance can be transferred between spouses/civil partners, saving up to £252 in tax.
Frequently asked questions
What are the UK income tax bands for 2026/27?
Personal Allowance 0% on first £12,570; Basic rate 20% on £12,571–£50,270; Higher rate 40% on £50,271–£125,140; Additional rate 45% above £125,140. Scotland has different bands with five rates from 19% to 48%.
What's the 60% effective tax rate?
Between £100,000 and £125,140, every extra £1 earned attracts 40% tax PLUS costs 50p of Personal Allowance (worth 20p more tax). Net: you keep 40p per £1 earned — 60% effective marginal rate.
Why is Scotland different?
The Scotland Act 2016 gave Holyrood power to set income tax rates on earned income for Scottish taxpayers. Scotland uses this to apply more progressive bands — more granular, slightly lower threshold to higher rate, higher top rate.
What is the effective vs marginal tax rate?
Marginal rate = what you pay on your NEXT £1 of income. Effective rate = your total tax divided by total income. A higher-rate taxpayer has a 40% marginal rate but typically a 15-30% effective rate.
Does National Insurance count as income tax?
No — NI is separate. But it acts like a tax. For 2026/27, employees pay 8% NI between £12,570 and £50,270, then 2% above. Combined with income tax, the total deduction rate is 28% (basic) or 42% (higher).
Are tax bands going up in 2026/27?
No. All income tax bands are frozen until at least April 2028 under current policy. Fiscal drag continues.
Quick links
- UK Tax Guide 2026/27 — full reference
- UK Tax Year 2026/27 — key dates
- UK Personal Allowance — the 60% taper explained
- Personal Savings Allowance — tax on savings interest
- UK Income Tax Calculator — see your take-home
