UK Bonus Payment Tax Calculator
Estimate how much of your bonus you keep after Income Tax, National Insurance, and Student Loan deductions.
How UK bonus tax works
In the UK, a bonus is treated as normal employment income under PAYE. That means your bonus can be taxed at your marginal rate (20%, 40%, 45%, or Scottish rates), plus National Insurance and possibly student loan deductions. This is why a bonus often feels “heavily taxed” compared with regular monthly pay.
The calculator above estimates your annual tax impact by comparing your yearly pay with and without the bonus. This usually gives a clearer picture than relying on a single payslip, where temporary over-withholding can happen.
What this calculator includes
- Income Tax bands for England/Wales/Northern Ireland or Scotland
- Personal Allowance tapering above £100,000 income
- Employee National Insurance (annual estimate)
- Optional student loan deduction estimate
- Optional pension salary sacrifice on bonus
Why your bonus can look overtaxed on payday
1) Payroll annualisation assumptions
Payroll software may project your current period earnings across the year, especially when a bonus is large. That can increase tax withheld in that pay period.
2) National Insurance is period-based in payroll
NI in real payroll is usually calculated per pay period. A one-off bonus month can attract higher NI in that month than you might expect from a pure annual view.
3) Student loan deductions stack on top
If you repay Plan 1, Plan 2, Plan 4, or Postgraduate loans, deductions increase as pay rises. Bonuses can trigger much larger deductions for that period.
Practical ways to improve bonus efficiency
- Pension salary sacrifice: Moving part of a bonus into pension can reduce tax and NI while boosting long-term savings.
- Check your tax code: A wrong tax code can distort deductions and reduce take-home pay.
- Consider timing: If your employer allows flexibility, tax-year timing can matter for thresholds and allowance tapering.
- Review payslip details: Compare taxable pay to expectations and ask payroll for clarification if needed.
Quick FAQ
Is bonus tax different from normal salary tax?
Not in principle. A bonus is taxed as income. It can seem different because it may push part of your earnings into a higher band.
Can a bonus reduce my Personal Allowance?
Yes. If your adjusted net income goes above £100,000, Personal Allowance reduces by £1 for every £2 over that level.
Does this replace professional advice?
No. This is an educational estimate tool and cannot cover every edge case (benefits-in-kind, multiple jobs, specific pension setups, etc.). For decisions, consider a payroll specialist or tax adviser.