- Understand when 40 percent tax kicks in and how the higher-rate band works so you only pay 40 percent on the portion of income above the threshold.
- Know what counts as taxable income including salary, bonuses, dividends and rental profits since combined income often pushes people into the higher-rate band.
- Reduce your 40 percent tax bill legally through pension contributions, Gift Aid, allowable expenses and efficient income structuring, especially if you run a limited company.
If you’re asking when 40 percent tax kicks in or how much can I earn before I pay 40% tax, here’s the quick answer: in 2025/26, you start paying 40% tax on income above £50,271. Not everything you earn is taxed at 40 percent, only the slice above that threshold.
With income tax bands frozen until 2031, more people are drifting into the higher-rate bracket each year, making it essential to understand how much you can earn before paying 40% tax and how the system actually works.
This guide breaks down exactly when you start paying 40% tax, how the higher-rate band is calculated, and the practical steps you can take to reduce your bill. We’ll also explain how the right tax accountant can help you optimize your position and avoid overpaying.
What is the 40% tax bracket?
The 40% tax bracket is the UK’s higher-rate income tax band. For the 2025/26 tax year (England, Wales, and Northern Ireland), it applies to taxable income between £50,271 and £125,140.
Crucially, the UK uses a marginal tax system. This means:
- You do not pay 40% tax on everything you earn
- You only pay 40% on the portion of income above £50,271
- Income below that point is still taxed at 0% or 20%, depending on the band it sits in
Here’s a quick snapshot of how income tax bands work for 2025/26:
| Tax Band | Taxable Income | Tax 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% |
The higher-rate band remains frozen until at least 2031. This means more people will enter the 40% bracket each year due to pay rises and inflation, even if tax bands themselves don’t change.
The role of tax codes (including 1257L)
Most PAYE employees will see a tax code on their payslip. In 2025/26, the most common code is 1257L, which reflects the standard £12,570 Personal Allowance.
You may move into the higher-rate band without noticing if:
- You have multiple incomes and the wrong tax code is applied
- HMRC hasn’t allocated your Personal Allowance correctly
- A bonus or overtime pushes you temporarily into a higher code for part of the year
If you’ve recently changed jobs or had a one-off payment, checking your tax code is one of the simplest ways to make sure you’re not overpaying.
When does 40% tax start in 2025/26?
For the 2025/26 tax year, 40% tax starts when your taxable income exceeds £50,271. This threshold applies to taxpayers in England, Wales and Northern Ireland, and it remains frozen until at least 2031.
That means you begin paying 40% tax on only the portion of your income above £50,271, not your full earnings.
Here’s a simple breakdown:
- Up to £12,570 is tax-free (your Personal Allowance)
- £12,571 to £50,270 is taxed at 20% (basic rate)
- £50,271 to £125,140 is taxed at 40% (higher rate)
- Over £125,140 is taxed at 45% (additional rate)
Because tax bands are frozen while wages continue to rise, more people will move into the 40% bracket each year through fiscal drag. Even a modest pay rise, bonus or side-income can tip you over the threshold.
Next, we’ll walk through exactly how the 40% band works in practice, using clear examples so you can see how much of your income is actually taxed at 40%.
How the 40% tax bracket works (with examples)
The UK uses a marginal tax system, meaning only the income that sits within the higher-rate band is taxed at 40%. Everything below £50,271 is still taxed at 0% or 20%.
This is where confusion often creeps in. Many people assume that once you cross the threshold, all your income is taxed at 40%, but that isn’t how the system works at all.
Example 1: someone earning £55,000
If your total taxable income is £55,000, here’s what you actually pay:
- 0% on the first £12,570
- 20% on income between £12,571 and £50,270
- 40% on income between £50,271 and £55,000
Only the final £4,729 is taxed at 40%. Not the whole £55,000.
If you want to check how these bands affect your pay in real time, our guide to UK tax brackets explains each threshold in more depth.
Example 2: someone earning £75,000
With a £75,000 income, the breakdown looks like this:
- 0% on £12,570
- 20% on £37,700 (the basic-rate band)
- 40% on £24,729 (the slice above £50,271)
Again, you’re only paying higher-rate tax on the portion within the band.
Directors and business owners often have more flexibility over how they withdraw money. If you fall into this group, it’s worth reviewing whether your mix of salary and dividends is still efficient. Our guide on the tax-efficient way to withdraw money explains how different pay strategies affect your tax position.
Bonuses, overtime and side income
One-off payments such as bonuses or commission can push a small portion of your income into the higher-rate band for that tax year. This can trigger temporary changes to your tax code, which sometimes leads to overpayments.
If you’ve recently received a bonus or switched jobs, it’s worth checking your code and your PAYE summary. A higher-rate position may be correct, but sometimes HMRC applies the wrong code by default.
Where to check your position
If you’re unsure how close you are to the threshold, or whether part of your income has moved into 40%, our Self Assessment tax return service helps ensure your calculations, allowances and tax codes are correct for the tax year.
What income counts towards the 40% tax band?
When HMRC decides whether you owe higher-rate tax, it looks at your total taxable income, not just your salary. This is why many people move into the 40% tax bracket without realising it.
Here’s what counts:
Employment income
Your wages, salary, overtime, commission and bonuses all form part of your taxable income.
Self-employment or side-hustle income
If you freelance, consult or run a small side business, the profit from this activity adds to your total taxable income. This often tips people into the higher-rate band unexpectedly.
Rental income
Profits from renting property also count and can push your earnings above £50,271.
Dividends
Directors and investors may cross into the 40% bracket once dividends are included. Dividends have their own tax rates, but they still count toward the band thresholds.
Benefits in kind
Company cars, private medical insurance and other taxable benefits increase your taxable income.
Investment income
Bank interest (beyond your Personal Savings Allowance), certain gains and other investment returns all contribute.
If you have several income streams and your tax code isn’t adjusted correctly, you may end up overpaying or underpaying tax. A review with a qualified tax accountant can help identify mismatches quickly.
The hidden costs of being a higher-rate taxpayer
Paying 40 percent tax is one part of the story. Several thresholds trigger once your income rises, and these can have a bigger financial impact than the rate itself.
Here is a clear summary of the hidden costs many higher-rate taxpayers face.
Hidden cost | What it is | Why it matters |
Personal Allowance taper | Your tax-free allowance reduces once income exceeds £100,000 | Creates an effective 60 percent marginal rate up to £125,140 |
High Income Child Benefit Charge | Child Benefit must be repaid as income rises | Full repayment applies at £60,000. See gov.uk for details: https://www.gov.uk/child-benefit-tax-charge |
Reduced savings allowance | Higher-rate taxpayers only receive £500 tax-free interest | More of your bank interest becomes taxable |
Student loan repayments | Additional 9 percent for most Plan 2 borrowers | Combined with tax and NI, marginal rates often surpass 50 percent |
National Insurance on salary | Salary attracts NI that dividends do not | Directors may use a salary and dividend blend to reduce NI exposure |
These thresholds can affect households without them realising it, especially where income fluctuates from year to year.
Legal ways to reduce your 40% tax bill
Once you understand how the higher-rate band works, the next step is learning how to reduce the amount of income taxed at 40 percent. The UK system includes several reliefs and adjustments that genuinely help higher-rate taxpayers keep more of what they earn.
Pension contributions
Pension payments reduce your taxable income and qualify for tax relief at your highest rate. This can bring your income back below £50,271 or even below £100,000 which restores some or all of your Personal Allowance.
If you are a company director, pension planning often sits alongside dividend strategy.
Gift Aid
Donating through Gift Aid extends your basic-rate band. This means more of your income is taxed at 20 percent rather than 40 percent and you can claim the difference through your Self Assessment.
Claiming allowable expenses
If you pay for work expenses such as professional subscriptions, tools or business travel between sites, you may be able to claim tax relief. Our Self Assessment expenses guide provides a clear breakdown of what is and is not allowed.
Structuring income if you run a business
Directors often use a combination of a small salary and dividends to minimise National Insurance and control how much taxable income falls into higher-rate territory. Reviewing your structure annually helps ensure it still fits your goals.
Even small pension or Gift Aid adjustments at the right time in the tax year can move part of your income back into the basic-rate band which immediately reduces the amount taxed at 40 percent.
How Sleek helps higher-rate taxpayers stay in control
The challenge with the 40 percent tax band is not only knowing when it applies. It is understanding how salary, dividends, benefits, side income, pensions and allowances all interact to create your final tax position. Small changes in one area often have a much bigger effect elsewhere which is why many higher-rate earners pay more tax than they need to.
Sleek helps you take control by reviewing how your income is structured, checking that your reliefs are applied correctly, preparing accurate filings and ensuring your tax codes reflect your real-world income. We also show you how upcoming changes to allowances and thresholds influence your future position so you can plan proactively rather than respond reactively.
If your income has recently changed or you are unsure whether you are paying the right amount of tax, Sleek gives you clarity and confidence as you navigate the higher-rate band.
Fill in the contact form and we will get back to you soonest.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
FAQs about 40% income tax
When do you start paying 40 percent tax in the UK?
You start paying 40 percent tax when your total taxable income goes above £50,271. Only the portion above that figure is taxed at 40 percent. Income below this threshold stays within the tax-free or basic-rate bands.
Do you pay 40 percent tax on all your income once you cross the threshold?
No. The UK uses a marginal system so only the income above £50,271 is taxed at 40 percent. Everything below that stays taxed at 0 or 20 percent. You can see how each band works in our guide to UK tax brackets.
What income counts towards the 40 percent tax bracket?
HMRC includes all taxable income. This covers salary, bonuses, dividends, rental profits, benefits in kind, self-employed earnings and most interest. If you have multiple income sources, they all combine to determine whether part of your income falls into the higher-rate band.
How much can you earn before paying 40 percent tax in 2025 and 2026?
You can earn up to £50,270 before any of your income moves into the 40 percent band. These thresholds are frozen until at least 2031 which means more people will enter this band due to regular pay rises and additional income sources.
Why am I paying 40 percent tax even though my salary is below £50,271?
You might have extra income such as savings interest, dividends or rental profits that push your total earnings above the threshold. A tax code error can also cause higher deductions. You can check how your income has been recorded using your P60 form.
How can I legally reduce the amount of income taxed at 40 percent?
Pension contributions, Gift Aid donations and allowable work expenses can reduce how much income falls in the higher-rate band. Directors can also review how they balance salary and dividends.
How do I claim back overpaid higher-rate tax?
You can reclaim overpaid tax through a corrected tax code, a Self Assessment return or by submitting a repayment claim to HMRC. Overpayments often occur after bonuses, job changes or unclaimed expenses, so it is worth reviewing your income for the year.
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