Marginal Tax Rate UK: What You Pay on Every Extra Pound

What is marginal tax rate? In short, it’s the percentage of tax applied to your next pound of income. Headline rates run from 0% to 45% in most of the UK, or higher in Scotland.

Hidden spikes can push the effective marginal tax rate up to 60%.

Most people know which tax band they’re in. Fewer realise their marginal tax rate — the rate on each extra pound — could be double what they expect.

The marginal tax meaning comes down to one thing: how much of your next pay rise, bonus, or side income you actually keep. That depends on where your earnings sit relative to a set of overlapping thresholds.

The UK operates a progressive tax system where income is taxed in layers, each at its own rate. Your marginal rate of tax depends on which layer your top pound of earnings falls into.

Frankly, this is where it gets complicated. Beyond the headline rates of 20%, 40%, and 45%, the system creates hidden marginal tax rate spikes. The personal allowance taper is the most notorious — but National Insurance, student loans, and child benefit clawbacks pile on further.

Understanding how marginal tax works helps you spot where your marginal tax rate might jump — and what you can do about it. This guide breaks it down with worked examples and practical steps.

How the UK Tax System Sets Your Rate

The UK uses a progressive tax system. Income is divided into bands, each taxed at a higher rate. The progressive tax system UK earners use means you pay the higher rate only on income inside that band — not on everything below.

Think of it as filling buckets. The first bucket — your personal allowance — holds £12,570 for 2026/27, completely tax-free. The next covers £37,700, taxed at 20%. Only after both are full does the 40% rate kick in.

Someone earning £55,000 has a marginal rate of income tax at 40%. But their effective rate — total tax divided by total income — is far lower. A large chunk of their earnings sits in the 0% and 20% bands.

It’s a common misunderstanding. Crossing the higher rate tax threshold doesn’t mean your entire salary is taxed at 40%.

The higher rate applies only to income above that line. Not a penny below it.

Scotland operates a different system with six bands — including a 19% starter rate and a 48% top rate. Scottish taxpayers should check Scottish income tax rates on GOV.UK for their specific position.

Marginal Tax Rate vs Effective Tax Rate

These two rates answer different questions. The marginal tax rate tells you what you’d pay on additional earnings. The effective rate shows your overall burden as a percentage of total income.

Worked example — earning £55,000 in 2026/27:

The first £12,570 is covered by the personal allowance at 0%. The next £37,700 — from £12,571 to £50,270 — is taxed at 20%, producing £7,540. The remaining £4,730 is taxed at 40%, producing £1,892.

Total income tax: £9,432. Divide that by £55,000 and the effective tax rate is roughly 17.1%. Yet the marginal rate on the next pound earned is 40%.

That gap — 17% versus 40% — is exactly why the distinction matters.

The marginal tax rate definition is simple: the rate on your last pound of income. It shapes financial decisions. Choosing between a cash bonus and a pension contribution depends on the marginal rate, not the effective one.

A marginal tax rate calculator can model these scenarios. The income tax rates page on this site shows the current UK income tax bands and thresholds.

UK Marginal Tax Rates

The headline income tax bands for 2026/27 in England, Wales, and Northern Ireland are unchanged. But they tell only part of the story. National Insurance contributions apply on top.

The marginal income tax rate UK taxpayers actually face, once NI is included, looks like this:

• Up to £12,570 — 0% income tax, 0% NI. Combined rate: 0%.
• £12,571 to £50,270 — 20% income tax plus 8% NI. Combined rate: 28%.
• £50,271 to £100,000 — 40% income tax plus 2% NI. Combined rate: 42%.
• £100,001 to £125,140 — 40% tax, 2% NI, plus the personal allowance taper. Combined rate: 62%.
• Above £125,140 — 45% income tax plus 2% NI. Combined rate: 47%.

That’s not a typo in the fourth band. The rate drops after £125,140 — from 62% back to 47%. The personal allowance taper causes this anomaly, commonly called the 60% tax trap.

These rates exclude student loan repayments and the high income child benefit charge. Both can push the true marginal rate higher still.

The 60% Marginal Rate Trap

The personal allowance taper is the single biggest rate spike in the UK tax system. The personal allowance reduction £100k threshold triggers means you lose £1 of your £12,570 personal allowance for every £2 above it. By £125,140, the allowance is gone.

Tax on income over £100,000 creates the 60 percent tax rate UK earners dread most.

Worked example — earning £110,000 in 2026/27:

Income above £100,000 is £10,000. For every £2 of that, £1 of personal allowance disappears. So £5,000 of previously tax-free income becomes taxable at 40%.

On that £10,000 slice: £4,000 in income tax (40%), plus £2,000 on the lost allowance (40% of £5,000), plus £200 in NI (2%). Total deduction: £6,200.

The 60% marginal rate personal allowance taper creates means keeping just £3,800 of a £10,000 pay rise. That’s a genuine shock for most people.

HMRC estimates suggest around 723,000 people had income in this band during 2025/26. Frozen thresholds pull more earners into the trap each year.

This matters for the marginal tax rate on bonus payments too. A one-off payment can push total earnings past £100,000 even when regular salary sits well below it.

The good news: understanding how to avoid 60% tax trap territory is half the battle. Pension contributions, salary sacrifice, and Gift Aid can all bring adjusted net income below £100,000.

Hidden Spikes That Inflate Your Rate

The 40% higher rate and the personal allowance taper get the most attention. But two other deductions quietly inflate the effective rate.

Student Loan Repayments

Student loan repayments aren’t technically a tax. But they’re deducted from earnings the same way. Plan 2 borrowers pay 9% on income above £29,385 for 2026/27.

A higher-rate taxpayer repaying a Plan 2 loan faces a combined rate of 51%. That’s 40% income tax, 2% NI, and 9% student loan. Inside the taper zone, the combined rate climbs to 71%.

Postgraduate loan repayments add another 6% on top of that.

High Income Child Benefit Charge

Parents earning between £60,000 and £80,000 face the high income child benefit charge. For every £200 above £60,000, 1% of child benefit is clawed back. By £80,000, the full amount is repaid through self-assessment.

For a two-child family, this adds roughly 11 percentage points to the marginal tax rate. Combined with income tax, NI, and a student loan, some parents face effective rates above 60%.

How to Reduce Your Marginal Tax Rate

The core question — how to reduce marginal tax rate liability — comes down to lowering adjusted net income. HMRC uses this figure to decide your personal allowance and threshold position.

Several strategies can reduce taxable income. UK taxpayers most commonly use these:

• Pension contributions marginal tax rate savings are significant. A £25,000 contribution from someone earning £125,000 brings adjusted income to £100,000, restoring the full personal allowance.
• Salary sacrifice marginal tax benefits work similarly. You agree to a lower gross salary and your employer pays the difference into your pension. The salary sacrifice guide on this site explains the mechanics.
• Gift Aid donations extend your basic rate band. Donating £8,000 creates a £10,000 gross donation, shifting income out of higher-rate territory.
• Spreading bonus income across tax years can prevent a single payment from triggering the taper or a higher band.

Each approach targets a specific spike. For earners near £100,000, pension contributions offer the largest saving. For parents near £60,000, a modest top-up can protect child benefit.

The tax-free income guide covers additional allowances to help reduce taxable income UK-wide.

What to Check Next

Your marginal tax rate depends on total income from all sources — salary, bonuses, dividends, rental income, and savings interest. A change in any of these can shift your position.

Check your tax code and income estimate through your personal tax account on GOV.UK. If income sits near the £100,000 or £60,000 thresholds, model the impact of pension contributions first.

With the marginal tax rate explained above, the next step is usually a pension or salary sacrifice calculation. That’s where the largest savings sit for most higher earners.

The marginal tax rate 2026/27 hasn’t shifted from last year — but frozen thresholds drag more earners into higher bands with each pay rise. Marginal tax UK rules stay stable for now, though your income probably won’t.

Key Takeaways

The main points from this guide:

• Your marginal tax rate is the rate on your next pound of income — often higher than the effective rate across your whole earnings.
• For 2026/27, the combined rate (income tax plus NI) ranges from 0% to 62%. The peak falls between £100,000 and £125,140.
• Student loan repayments and child benefit clawbacks can push effective rates above 60% for earners well below £100,000.
• Pension contributions and salary sacrifice are the most direct tools for lowering adjusted net income.
• The marginal rate matters most when choosing between cash and pension — it tells you what you’d actually keep.

Common Marginal Tax Rate Questions

A few of the questions that tend to come up once you start digging into marginal tax.

Does Scotland have different marginal tax rates?

Yes — Scotland uses six income tax bands instead of three. The starter rate is 19%, and the top rate reaches 48% on income above £125,140.

In 26/27 between £43,663 and £50,270, Scottish taxpayers pay 42% compared with 20% elsewhere. The personal allowance taper and NI rates apply UK-wide, so the 60% trap above £100,000 affects Scottish earners equally.

Can a pay rise leave me worse off?

Not in absolute terms — earning more doesn’t reduce your total income. But a pay rise can leave you with a surprisingly small increase in take-home pay.

Moving from £100,000 to £110,000 costs £6,200 in tax and NI on that extra £10,000. That’s why many earners redirect the surplus into pensions.

How do dividends affect my marginal tax rate?

Dividends are taxed after your other income, so they sit in whatever band your salary has already pushed you into. For 2026/27, dividend rates are 10.75% (basic), 35.75% (higher), and 39.35% (additional).

Dividends count toward the £100,000 threshold. A mix of salary and dividends crossing that figure can trigger the 60% trap.

What is my marginal tax rate and how do I find it?

Take your total expected income from all sources and check which tax band the top pound falls into. That band’s rate — plus NI and any student loan or HICBC deduction — is your marginal rate.

Your personal tax account on GOV.UK shows estimated income and your tax code. That’s the quickest way to check.

Does my marginal rate change my tax code?

Not directly — your tax code shows your personal allowance, not your marginal rate. But if income exceeds £100,000, HMRC reduces the allowance, which changes your code and increases PAYE deductions.

A code starting lower than expected — or 0T, meaning no allowance — can signal the taper. Check your code if income has recently changed.