| Item | Take as Cash | Sacrifice All |
|---|---|---|
| Gross Bonus | £0 | £0 |
| Income Tax | £0 | £0 |
| Employee NI | £0 | £0 |
| Employer NI Added | £0 | £0 |
| You Receive / Pension Gets | £0 | £0 |
When you sacrifice your bonus into a pension, the money goes to your pension before income tax and National Insurance are calculated. This means the full gross amount lands in your pension pot · nothing is deducted. Compare that to taking it as cash, where you pay income tax at your marginal rate plus employee NI.
Basic-rate taxpayer: Taking a £5,000 bonus as cash costs 20% tax + 8% NI = you keep £3,600. Sacrificed to pension: the full £5,000 goes in. You are £1,400 better off in the pension.
Higher-rate taxpayer: Taking a £5,000 bonus as cash costs 40% tax + 2% NI = you keep £2,900. Sacrificed: the full £5,000 goes in · a saving of £2,100.
£100,000 trap: If your salary plus bonus crosses £100,000, your personal allowance tapers (£1 lost per £2 over). Bonus sacrifice can pull your income back below this threshold and restore the allowance, creating an effective 60% saving on that portion.