Estimate tax on your UK work bonus using a simple annual method. Enter your salary and bonus to see estimated Income Tax, Employee National Insurance, and net bonus take-home pay.
Assumptions: UK (England/Wales/Northern Ireland) rates, personal allowance taper above £100,000, and employee NI annualised. This is an estimate, not tax advice.
How bonus tax works in the UK
A bonus is taxed as normal employment income under PAYE. That means there is no separate “bonus tax” rate by law. Instead, your bonus is added to your taxable pay, and the system applies the same tax bands that apply to salary.
In practice, a bonus can feel like it is taxed more heavily because all or part of it may fall into a higher tax band. If your total income crosses a threshold, the bonus portion above that line is taxed at the higher marginal rate.
What this bonus tax calculator uk estimates
- Income Tax on your base salary versus base salary + bonus
- Employee National Insurance impact from the bonus
- Cash bonus after tax and NI
- Effective deduction percentage
- Optional reduction in taxable bonus through pension salary sacrifice
Why your payslip may look different
Monthly payroll software can temporarily over- or under-collect tax depending on your tax code, pay frequency, prior pay periods, and adjustments. Over the full tax year, PAYE usually self-corrects. This calculator uses annualised estimates, which are often better for planning than one payslip in isolation.
Common reasons bonus take-home feels low
- Higher-rate band entry: part of bonus taxed at 40% (or 45% at additional rate).
- Personal allowance taper: above £100,000, allowance reduces by £1 for every £2 of income.
- National Insurance: bonus is also subject to employee NI unless salary sacrifice applies.
- Other deductions: pension, student loan, childcare or benefit adjustments can reduce net pay.
Example: bonus tax estimate in plain English
If your salary is £45,000 and your bonus is £5,000, part of that bonus may still be in basic-rate tax and part may be in higher-rate tax depending on your exact annual taxable income. This is why two colleagues with different salaries can receive very different net amounts from the same gross bonus.
Tips to improve bonus efficiency
1) Use pension salary sacrifice where available
If your employer supports bonus sacrifice to pension, the sacrificed portion is usually not subject to Income Tax or employee NI at the point of payment. You receive less cash now, but more goes into long-term savings tax-efficiently.
2) Check your tax code
A wrong or emergency tax code can distort bonus-month net pay. If the code is incorrect, HMRC or your payroll team can usually fix it and apply corrections.
3) Plan around key thresholds
If your total income is near a threshold (for example around £50,270 or £100,000), even a modest bonus can materially change your effective tax rate. Forecasting ahead can help with pension and cash-flow decisions.
FAQ
Is there a special UK bonus tax rate?
No. Bonuses are taxed as employment income under normal tax bands. The perceived “bonus rate” is really your marginal rate for that slice of income.
Why did my employer tax nearly half my bonus?
If your bonus landed in higher or additional tax bands, and NI was also due, your combined deductions can be substantial. That does not necessarily mean the payroll is wrong.
Does this calculator include Scotland rates?
This version is configured for England, Wales, and Northern Ireland for clarity. Scottish Income Tax uses different bands and rates, so use a Scotland-specific model for precision.
Final word
A reliable bonus tax estimate helps you make better choices: spend, save, invest, or contribute to pension. Use the calculator as a planning tool, then compare with your payslip and P60 for year-end confirmation.