£5,000 bonus on £45,000 salary: Take-home and tax breakdown 2026/27
A £5,000 bonus paid on top of a £45,000 base salary in 2026/27 leaves £3,600 in cash take-home after Income Tax and employee National Insurance. That is an effective marginal rate of 28.0% on the bonus pound. Baseline annual take-home before the bonus is £35,920; with the bonus paid as cash the figure rises to £39,520. Figures below assume England rest-of-UK rates and no pension contribution.
Bonus tax breakdown
Per-line contribution of the bonus only (combined payslip minus baseline-salary payslip).
| Line | Amount |
|---|---|
| Gross bonus | £5,000 |
| Income Tax on bonus | £1,000 |
| Employee NI on bonus | £400 |
| Pension (assumed nil for this scenario) | £0 |
| Net bonus take-home | £3,600 |
| Effective marginal rate | 28.0% |
Annual payslip vs baseline
| Annual figure | £45,000 only | + £5,000 bonus | Bonus impact |
|---|---|---|---|
| Gross | £45,000 | £50,000 | +£5,000 |
| Income Tax | £6,486 | £7,486 | +£1,000 |
| National Insurance | £2,594 | £2,994 | +£400 |
| Take-home | £35,920 | £39,520 | +£3,600 |
Same £5,000 bonus, different salaries
How the same bonus is taxed depends entirely on the base salary it stacks on top of.
Different bonus sizes on the same £45,000 salary
Next steps
- Bonus tax calculator hub - run any custom salary + bonus combination.
- Salary calculator - the underlying engine, with full payslip breakdown.
- Pension contribution calculator - work out the optimal contribution rate.
- Salary sacrifice calculator - bonus-into-pension comparison vs cash.
- Tax trap calculator - £100k Personal Allowance taper walkthrough.
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Frequently asked questions
- How much tax do I pay on a £5,000 bonus with a £45,000 salary?
- On a £45,000 base salary in 2026/27, a £5,000 bonus generates £1,000 of Income Tax and £400 of employee National Insurance. After PAYE deductions the bonus take-home is £3,600 - an effective marginal rate of 28.0% on the bonus pound.
- What is the effective marginal rate on this bonus?
- 28.0% across Income Tax and employee NIC combined. The bonus sits in basic-rate territory: 20% Income Tax plus 8% employee NI. Pension sacrifice still saves the full 28%, but the cash kept is meaningful.
- Would salary-sacrificing this £5,000 bonus into pension be worth it?
- Sacrificing the bonus puts the full £5,000 into your pension pot tax-free vs £3,600 cash in hand - a gain of £1,400 of pension value over cash. The trade-off is liquidity: pension money is locked until age 57 (rising to 58 in 2028). At 28.0% marginal the gain is smaller, so the decision depends on your liquid-savings buffer and pension contribution headroom.
- Why might the bonus payslip show more tax taken than this figure?
- PAYE uses cumulative year-to-date estimates: a one-off bonus in month 6 makes payroll think your annual income has doubled, so the bonus month over-withholds. The remaining months gradually correct it. The annual total reconciles to the figure shown here.