Marginal Tax Rate Calculator UK 2025/26
Find out your real tax rate — the marginal rate on your next pound of income and your effective average rate. Identifies the £100K tax trap zone where your marginal rate jumps to 62%. Covers England, Wales, Northern Ireland, and Scotland.
Your Income by Tax Band
Tax Band Breakdown
| Band | Income Range | Rate | Tax | NI | Combined |
|---|
UK Tax Bands & Combined Marginal Rates 2025/26
| Income Band | Income Tax | Employee NI | Combined Marginal Rate | You Keep per £1 |
|---|---|---|---|---|
| £0 - £12,570 | 0% | 0% | 0% | £1.00 |
| £12,571 - £50,270 | 20% | 8% | 28% | £0.72 |
| £50,271 - £100,000 | 40% | 2% | 42% | £0.58 |
| £100,001 - £125,140 | 60%* | 2% | 62% | £0.38 |
| £125,141+ | 45% | 2% | 47% | £0.53 |
* The 60% effective rate in the £100K-£125K band is caused by the Personal Allowance taper: 40% higher rate tax + 20% from losing £1 of allowance for every £2 earned over £100,000.
Scottish Tax Bands & Combined Marginal Rates 2025/26
| Income Band | Income Tax | Employee NI | Combined Marginal Rate | You Keep per £1 |
|---|---|---|---|---|
| £0 - £12,570 | 0% | 0% | 0% | £1.00 |
| £12,571 - £14,876 | 19% | 8% | 27% | £0.73 |
| £14,877 - £26,561 | 20% | 8% | 28% | £0.72 |
| £26,562 - £43,662 | 21% | 8% | 29% | £0.71 |
| £43,663 - £50,270 | 42% | 8% | 50% | £0.50 |
| £50,271 - £75,000 | 42% | 2% | 44% | £0.56 |
| £75,001 - £100,000 | 45% | 2% | 47% | £0.53 |
| £100,001 - £125,140 | 67.5%* | 2% | 69.5% | £0.305 |
| £125,141+ | 48% | 2% | 50% | £0.50 |
* Scottish taxpayers in the PA taper zone face a 67.5% effective income tax rate (45% advanced rate + 22.5% from allowance taper). Combined with 2% NI, the marginal rate is 69.5%.
The £100K Tax Trap Explained
If you earn between £100,001 and £125,140, you are caught in what tax professionals call the "60% tax trap" — one of the most punishing sections of the UK tax code. It affects around 700,000 taxpayers and yet most people do not know it exists until they see their payslip.
Here is how it works. Every UK taxpayer receives a Personal Allowance of £12,570 — the amount you can earn completely tax-free. But once your income exceeds £100,000, HMRC claws this back at a rate of £1 for every £2 you earn above the threshold. By the time you reach £125,140, your Personal Allowance has been reduced to zero.
The maths creates a devastating marginal rate. For every extra £100 you earn in this band, you pay £40 in higher rate income tax (40%). But you also lose £50 of Personal Allowance, and that £50 — which was previously tax-free — now gets taxed at 40%, costing you an additional £20. So on £100 of extra income, you pay £60 in income tax — an effective rate of 60%. Add 2% National Insurance on top and you are paying 62% on every additional pound.
To put this into real terms: someone earning £110,000 pays more tax per additional pound than someone earning £500,000 (who pays 47%). That is not a mistake — it is the actual structure of UK tax law, and it makes the £100K-£125K zone the single highest marginal rate for most employed taxpayers in the country.
The Personal Allowance is fully withdrawn at £125,140 because £125,140 = £100,000 + (2 x £12,570). At exactly £125,140, you have lost the entire £12,570 allowance.
UK Tax Bands & Marginal Rates 2025/26
Understanding how UK tax bands interact with National Insurance is essential for grasping your true marginal rate. While HMRC quotes income tax rates in isolation, what matters for your pay packet is the combined bite — income tax plus employee NI — on each pound of income.
For England, Wales, and Northern Ireland taxpayers, there are five distinct marginal zones in 2025/26. The Personal Allowance zone from £0 to £12,570 where you keep every penny. The basic rate zone from £12,571 to £50,270 where you pay 20% income tax and 8% NI — a combined 28% marginal rate, keeping 72p per £1. The higher rate zone from £50,271 to £100,000 at 40% tax plus 2% NI — a 42% marginal rate, keeping 58p per £1. The Personal Allowance taper zone from £100,001 to £125,140 where the effective income tax rate is 60% plus 2% NI — a 62% marginal rate, keeping just 38p per £1. And finally the additional rate zone above £125,140 at 45% tax plus 2% NI — a 47% marginal rate, keeping 53p per £1.
Notice the anomaly: the marginal rate actually drops from 62% to 47% once you pass £125,140. This means taxpayers in the taper zone are the worst hit — paying more per pound than even the highest earners.
How to Reduce Your Marginal Tax Rate
If you are caught in a high marginal rate band — particularly the 62% trap zone — there are legitimate, HMRC-approved strategies to reduce the tax you pay on your next pound of income.
Pension Contributions
This is by far the most powerful tool, especially for those earning between £100,000 and £125,140. When you make a pension contribution, your taxable income is reduced by the gross amount of the contribution. If your income is £115,000 and you contribute £15,000 to a pension, your taxable income drops to £100,000 — fully restoring your Personal Allowance and pulling you out of the 62% trap entirely.
The effective cost of that £15,000 pension contribution? Just £5,700. You save £9,300 in tax (62% of £15,000). Every £1 you put into your pension effectively costs you just 38p. No other financial decision offers this kind of leverage for employed taxpayers.
Salary Sacrifice
Salary sacrifice arrangements — where you agree to a lower salary in exchange for employer pension contributions, electric car leasing, or cycle-to-work schemes — reduce your gross salary before tax and NI are calculated. This is particularly effective because it also saves National Insurance (both employee and employer), making it even more efficient than personal pension contributions in some cases.
Gift Aid Donations
Charitable donations made under Gift Aid extend your basic rate band by the gross value of the donation. For higher and additional rate taxpayers, this can reduce the amount of income taxed at 40% or 45%. For those in the taper zone, Gift Aid donations can help restore lost Personal Allowance — the charity gets 25% extra from HMRC and you get up to 62% relief on the donation through your Self Assessment tax return.
Spreading Income Across Tax Years
If you have control over when income is received — for example, through bonus timing, dividend declarations, or freelance invoice dates — you can sometimes avoid pushing income into a higher marginal band. This requires careful planning but can save significant tax, particularly around the £50,270 and £100,000 thresholds.
Effective vs Marginal Tax Rate
These two rates measure fundamentally different things, and confusing them leads to widespread misunderstanding about how much tax people actually pay.
Your marginal tax rate is the rate you pay on your next pound of income. It tells you how much of a pay rise, bonus, or overtime payment you will actually keep. If your marginal rate is 42%, you keep 58p of every extra £1 you earn. Marginal rates change abruptly at band thresholds.
Your effective (or average) tax rate is the total income tax and NI you pay divided by your total gross income. It represents the average rate across all your earnings, including the tax-free Personal Allowance and the lower-rate bands. It is always lower than your marginal rate because your first £12,570 is taxed at 0%, the next chunk at 20%, and so on.
For example, someone earning £80,000 has a marginal rate of 42% (40% tax + 2% NI) but an effective rate of roughly 27%. Someone earning £110,000 has a marginal rate of 62% but an effective rate of about 35%. The marginal rate matters for decisions about earning more money; the effective rate shows your overall tax burden.
Scottish vs English Marginal Rates
Scotland sets its own income tax rates and bands, which differ significantly from the rest of the UK. The key differences for 2025/26 are additional bands and higher top rates.
Scotland has six income tax bands compared to three for England, Wales, and Northern Ireland. The Starter rate of 19% applies to the first £2,306 of taxable income (£12,571-£14,876). Then Basic at 20% up to £26,561, Intermediate at 21% up to £43,662, Higher at 42% up to £75,000, Advanced at 45% up to £125,140, and the Top rate of 48% on everything above £125,140.
The critical difference is that Scottish higher rate taxpayers pay 42% instead of 40%, and the top rate is 48% compared to 45% for the rest of the UK. In the Personal Allowance taper zone (£100K-£125K), Scottish taxpayers face an even more brutal marginal rate: the 45% Advanced rate plus 22.5% from the PA taper effect equals 67.5% income tax, plus 2% NI — a combined 69.5% marginal rate. That means for every extra £1 earned in this zone, a Scottish taxpayer keeps just 30.5p.
National Insurance is not devolved, so employee NI rates (8% and 2%) are the same across the UK.
Example Scenarios
Scenario 1: £45,000 — Approaching the Higher Rate Threshold
Region: England | Marginal Rate: 28% | Effective Rate: ~20.3%
At £45,000, you are firmly in the basic rate band. Every extra pound is taxed at 20% income tax and 8% NI — a combined 28%. You are £5,270 away from the higher rate threshold at £50,270. If you are expecting a pay rise or bonus that would push you over £50,270, your marginal rate on income above that point jumps to 42%. Consider increasing pension contributions to keep your taxable income below £50,270 and maintain the lower 28% marginal rate on that additional income.
Scenario 2: £80,000 — Higher Rate Taxpayer
Region: England | Marginal Rate: 42% | Effective Rate: ~27.4%
At £80,000, you are in the higher rate band and every extra £1 costs you 42% in combined tax and NI. You keep 58p. Your effective rate is much lower at around 27% because your first £12,570 was tax-free and income up to £50,270 was only taxed at the basic rate. You are £20,000 away from the £100K tax trap. If you receive a significant bonus or promotion that could take you over £100,000, plan ahead with pension contributions to avoid the 62% trap.
Scenario 3: £105,000 — Inside the 60% Tax Trap
Region: England | Marginal Rate: 62% | Effective Rate: ~33.0%
You are in the most punishing part of the UK tax system. At £105,000, you have already lost £2,500 of your Personal Allowance (£5,000 over £100K, halved). Your marginal rate of 62% means you keep just 38p of every extra £1. Pension strategy: If you contribute £5,000 to a pension, your taxable income drops to £100,000, fully restoring your Personal Allowance. That £5,000 contribution saves you £3,100 in tax — an effective cost of just £1,900 for £5,000 in your pension. This is the single most tax-efficient move available to any UK taxpayer.
Scenario 4: £150,000 — Additional Rate Taxpayer
Region: England | Marginal Rate: 47% | Effective Rate: ~36.8%
At £150,000, you have passed through the trap zone and your marginal rate has actually dropped to 47% (45% additional rate + 2% NI). You have no Personal Allowance left (it was fully withdrawn at £125,140). Your effective rate of around 37% reflects the blended average across all bands. Pension contributions still provide 47% marginal relief — contributing £10,000 saves £4,700 in tax and NI. For additional rate taxpayers, Gift Aid is also powerful as it extends the basic rate band.
How This Calculator Works
Our Marginal Tax Rate Calculator uses the official HMRC income tax bands and National Insurance thresholds for the 2025/26 tax year to compute four key metrics for your income level.
First, it determines your marginal rate — the combined income tax and NI rate applied to your next pound of earnings. It accounts for the Personal Allowance taper above £100,000, which creates the effective 60% income tax zone. Second, it calculates your effective rate by computing the total income tax and NI payable across all bands and dividing by your gross income. Third, it shows the tax on your next £1,000 of income, calculated at your current marginal rate. Fourth, it computes the cost of earning £1 net — how much gross income you need to take home one pound after tax and NI.
When you enter a pension contribution percentage, the calculator reduces your taxable income by that amount before applying the tax bands. This is particularly powerful for demonstrating the impact of pension contributions in the 62% trap zone, where the tax savings can be dramatic.
The visual tax band bar shows the proportion of your income that falls into each band, giving you an instant picture of where your money goes. The breakdown table provides the exact figures — tax, NI, and combined deduction — for each band your income passes through.
Who Should Use This Calculator
This calculator is designed for anyone who wants to understand the true cost of earning their next pound. It is particularly valuable for employees negotiating pay rises, freelancers setting rates, business owners deciding on salary vs dividends, and anyone approaching or inside the £100K tax trap zone. Understanding your marginal rate is the first step to making informed financial decisions about pension contributions, salary sacrifice, and tax planning.
Official Sources & References
Frequently Asked Questions
Your marginal tax rate is the rate of tax you pay on your next pound of income. It includes both income tax and National Insurance combined. For example, if you earn £40,000, your marginal rate is 28% (20% basic rate tax + 8% employee NI), meaning you keep 72p of every extra £1 earned. The marginal rate changes as your income crosses different tax band thresholds — it is not the same as the average rate you pay across all your income.
The £100K tax trap occurs because your Personal Allowance of £12,570 is reduced by £1 for every £2 you earn above £100,000. This creates an effective 60% income tax rate in the £100,001 to £125,140 band. Here is the maths: on each extra £100 earned, you pay £40 in 40% income tax, but you also lose £50 of Personal Allowance which is then taxed at 40% — costing another £20. Total: £60 tax on £100 income, or 60%. Combined with 2% NI, your marginal rate is 62%. The allowance is fully gone at £125,140.
The marginal rate is the tax on your next £1; the effective rate is your total tax divided by total income. Marginal tells you what a pay rise costs; effective shows your overall burden. Someone earning £80,000 has a 42% marginal rate but only a ~27% effective rate, because their first £12,570 was tax-free and income up to £50,270 was taxed at just 20%. The effective rate is always lower than the marginal rate.
Because the Personal Allowance taper adds an invisible extra tax on top of the 40% higher rate. For every £2 earned above £100,000, you lose £1 of your £12,570 Personal Allowance. That lost allowance is then taxed at 40%, adding an effective 20% to your rate (40% x 50%). So 40% official rate + 20% from allowance loss = 60% effective income tax. Add 2% employee NI and you reach 62%. Once you pass £125,140, the allowance is fully withdrawn, your rate drops to 45% + 2% = 47%.
Pension contributions reduce your taxable income, which can move you into a lower marginal band. This is most powerful in the £100K-£125K trap zone. If you earn £110,000 and contribute £10,000 to a pension, your taxable income falls to £100,000 — fully restoring your Personal Allowance and saving up to 62% on the contributed amount. That £10,000 pension contribution effectively costs you just £3,800 (you save £6,200 in tax and NI). For higher and additional rate taxpayers outside the trap zone, pension relief is still 42% or 47% respectively.
Yes. Scotland has six income tax bands with rates ranging from 19% (Starter) to 48% (Top). Key differences: Scottish Higher rate is 42% vs 40%, and the Top rate is 48% vs 45%. In the PA taper zone (£100K-£125K), Scottish taxpayers face an even higher marginal rate of up to 69.5% (45% Advanced rate + 22.5% from PA taper + 2% NI). National Insurance rates are the same across the UK as NI is not devolved.
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Official Sources
UK Calculator Editorial Team
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