Bonus Tax Calculator UK
Estimate how much of your annual bonus you may keep after PAYE income tax, employee National Insurance, and optional pension salary sacrifice. This calculator uses 2024/25 UK tax assumptions and compares your annual pay before and after the bonus to estimate the extra deductions created by the bonus.
- Supports England, Wales, Northern Ireland, and Scotland.
- Shows gross bonus, tax, NIC, pension, and estimated net bonus.
- Visual chart helps you see where your money goes.
Your estimated results
Enter your salary and bonus, then click Calculate Bonus Tax.
Bonus breakdown chart
See how your gross bonus is split between tax, employee NIC, pension sacrifice, and estimated take-home pay.
How a bonus is taxed in the UK
A work bonus can feel rewarding right up until you open your payslip and realise the net amount is much lower than the headline figure. That surprise is exactly why a bonus tax calculator for the UK is useful. In most cases, your bonus is treated as employment income under PAYE, which means it can be subject to income tax and employee National Insurance contributions in much the same way as your salary. If your employer offers salary sacrifice pension contributions, part of the bonus may also be redirected before tax and NIC are calculated, which can change the final amount you receive.
The key point is that bonuses are not normally taxed using a special “bonus tax rate.” Instead, the bonus is added to your taxable pay, and the extra income may push part or all of that payment into a higher marginal tax band. In practical terms, a person earning close to the higher-rate threshold may find a significant part of their bonus taxed at 40% in England, Wales, or Northern Ireland, or at the relevant Scottish higher rate if they are a Scottish taxpayer. On top of that, National Insurance may apply at 8% or 2% for employees under 2024/25 annual assumptions, depending on earnings levels.
Why your payslip may not match a simple percentage
Many people expect a £5,000 bonus to mean losing a flat 20% or 40% in tax. Real payroll does not work that way. PAYE is usually run each pay period using cumulative or non-cumulative methods depending on your tax code, and payroll software looks at your pay for the period, tax code, previous pay, and previous tax paid. As a result, the tax taken from a monthly bonus can look high, especially if the payroll system assumes your current pay level will continue for the rest of the tax year. Over time, if too much tax has been taken, this can often correct itself through later payslips or after the tax year via HMRC reconciliation.
This calculator therefore uses an annualised estimate: it compares your annual income without the bonus to your annual income with the bonus. That gives a clean way to estimate the extra income tax and NIC caused by the bonus itself. For planning purposes, this is often the most helpful way to think about a bonus, even though the exact payslip result may differ.
What this bonus tax calculator includes
- Gross annual salary before the bonus.
- Gross bonus amount.
- Tax region for England, Wales, Northern Ireland, or Scotland.
- Optional pension salary sacrifice percentage applied to the bonus.
- An estimate of extra income tax created by the bonus.
- An estimate of extra employee National Insurance created by the bonus.
- A final estimated net bonus figure.
It does not include every payroll adjustment. For example, student loans, postgraduate loans, childcare vouchers, company car tax, private medical insurance, attachment orders, and irregular tax codes can all alter your actual take-home pay. Still, for most employees, the combination of income tax, NIC, and pension salary sacrifice explains the largest part of the difference between the gross bonus and the amount paid into the bank.
2024/25 UK tax bands at a glance
The tables below summarise the most important thresholds used when estimating bonus tax. These figures are useful because a bonus often changes the marginal rate applied to your next pound of income. If your annual salary already uses up the basic-rate band, much of the bonus can fall straight into a higher band.
| Region | Band | Thresholds used for 2024/25 | Rate |
|---|---|---|---|
| England / Wales / Northern Ireland | Basic rate | Taxable income above personal allowance up to £50,270 total income | 20% |
| England / Wales / Northern Ireland | Higher rate | £50,271 to £125,140 total income | 40% |
| England / Wales / Northern Ireland | Additional rate | Above £125,140 | 45% |
| Scotland | Starter / Basic / Intermediate | £12,571 to £43,662 total income across three bands | 19%, 20%, 21% |
| Scotland | Higher / Advanced / Top | £43,663 to £75,000, then £75,001 to £125,140, then above £125,140 | 42%, 45%, 48% |
| Deduction type | 2024/25 annual threshold | Rate | Why it matters for bonuses |
|---|---|---|---|
| Personal allowance | Up to £12,570 normally tax-free | 0% | If total income rises above £100,000, the allowance is tapered, increasing the effective tax cost of part of a bonus. |
| Employee National Insurance main rate | £12,570 to £50,270 | 8% | Bonuses within this band attract a meaningful extra NIC deduction on top of income tax. |
| Employee National Insurance upper rate | Above £50,270 | 2% | Once earnings are above the upper threshold, NIC on the bonus falls sharply compared with the main rate. |
Personal allowance taper and the hidden cost of a large bonus
One of the most misunderstood areas of UK bonus taxation is what happens around £100,000 of income. Once adjusted net income exceeds £100,000, the personal allowance starts to reduce by £1 for every £2 of income above that level. That means someone receiving a bonus in this range can face a much steeper effective tax cost than expected, because they are not only paying higher-rate tax on the additional pay, but also gradually losing tax-free allowance. In broad planning terms, this can create an effective 60% income tax band for many taxpayers in England, Wales, and Northern Ireland over that taper range, before considering NIC.
This matters for year-end and performance bonuses. A professional on a £98,000 salary receiving a £10,000 bonus may notice a much larger reduction than a colleague on a lower salary, even if both are under the same contractual bonus scheme. If your employer offers pension salary sacrifice, redirecting some of the bonus into pension can sometimes be an efficient way to reduce taxable income and preserve more of the personal allowance.
Scotland and the effect on bonus estimates
Scottish taxpayers have different income tax bands from the rest of the UK for non-savings, non-dividend income such as salary and bonuses. This means the same £5,000 bonus can produce a different tax result depending on whether you are classed as a Scottish taxpayer by HMRC. National Insurance remains a UK-wide system, so the main difference in the calculator comes from the income tax side. In Scotland, people can move through more bands as income rises, which makes marginal bonus planning more granular.
How to use the calculator well
- Enter your gross annual salary before the bonus.
- Enter the gross bonus you expect to receive.
- Select your tax region carefully.
- If part of the bonus will be sacrificed into pension, enter the percentage.
- Click the calculate button to see the estimated tax, NIC, pension amount, and net bonus.
If you are paid monthly and want a quick sense check, compare the estimated net bonus with your expected payslip. If the payslip tax looks materially different, the most common reasons are your tax code, cumulative PAYE effects, or additional deductions not included here.
Worked examples
Example 1: Mid-income employee in England
Suppose your salary is £45,000 and you receive a £5,000 bonus. Without pension sacrifice, much of that bonus remains within the basic-rate tax range, but the very top may edge into higher-rate territory depending on your exact taxable income and any benefits. Under a simple annual estimate, the bonus can be reduced by 20% income tax on the portion in basic rate and 8% employee NIC where relevant. Your net bonus may therefore be noticeably below the gross figure, but not necessarily by as much as a flat 40% headline would suggest.
Example 2: Higher-rate employee near £50,270
If your base salary is £50,000 and you receive a £10,000 bonus, part of that bonus is likely to fall into the 40% higher-rate tax band. However, once your earnings are above the employee NIC upper threshold, NIC on the upper part falls to 2%. This creates an important distinction: moving into higher-rate tax does not mean NIC also jumps higher. In fact, NIC often becomes less severe above the threshold, partially offsetting the extra income tax cost.
Example 3: Using pension salary sacrifice
If you sacrifice 20% of a £10,000 bonus into pension, £2,000 goes directly into your pension pot and only £8,000 is treated as taxable pay for this estimate. That can reduce both income tax and employee NIC while boosting long-term retirement savings. The immediate cash in your payslip is lower, but the total value retained between net pay and pension may be much more attractive.
How accurate are online bonus tax calculators?
A good calculator is highly useful for planning, but it is still an estimate. The most accurate source for your actual deductions is your employer’s payroll run and your final payslip. That said, an annualised calculator remains an excellent decision-making tool for comparing scenarios, such as taking the bonus fully in cash versus sacrificing some into pension, or seeing the rough impact of crossing a tax threshold. It can also help with budgeting: once you know the likely net figure, you can make better choices about saving, debt repayment, or investing.
Common questions about bonus tax in the UK
Is bonus pay taxed differently from salary?
No. In most payroll situations, a bonus is taxed as employment income under PAYE. The difference is usually that the extra pay pushes more income into a higher marginal band, making the deductions feel heavier.
Why was my bonus taxed so much?
The most common reasons are that your pay for the month was unusually high, part of the bonus entered a higher tax band, or your payroll software applied PAYE assumptions for the current period that made the immediate deduction look steep. Cumulative tax calculations can later smooth this out.
Can pension sacrifice reduce bonus tax?
Yes, where your employer allows it. Sacrificing part of the bonus into pension can reduce taxable pay and employee NIC, and may be especially useful around higher-rate thresholds or the £100,000 personal allowance taper zone.
Do Scotland and England have different bonus tax outcomes?
Yes for income tax, because Scottish rates and bands differ. No for employee NIC, because National Insurance rules are broadly UK-wide for this purpose.
Final takeaway
A UK bonus is not hit by a mysterious standalone tax. It is usually your normal tax and National Insurance system reacting to a one-off jump in earnings. The smartest way to estimate the impact is to compare annual income before and after the bonus, which is exactly what this calculator does. If you are deciding how much of a bonus to keep in cash, how much to redirect to pension, or whether a planned bonus may push you into a new band, using a reliable bonus tax calculator UK estimate is one of the fastest ways to understand the real value of the payment before payday arrives.
Figures shown by the calculator are estimates based on 2024/25 assumptions and are for general informational use only.