How UK Bonuses Are Taxed, Salary After Tax With Bonus

Bonuses are taxed as ordinary employment income

In the UK, cash bonuses are treated as employment income and taxed through PAYE in exactly the same way as your regular salary. There is no special 'bonus tax rate', the rate that applies to your bonus depends on which income tax band the bonus pushes your total earnings into. This means the same 20%, 40% and 45% bands apply, along with employee National Insurance at 8% or 2% above £50,270.

The practical effect is that bonus payments can feel disproportionately taxed. If you receive a £5,000 bonus in a single pay period and you already earn £50,000 per year, PAYE will deduct tax at a 40% marginal rate on the bonus (since it sits above the £50,270 threshold on an annualised basis). Even if the annual figure would not have crossed the threshold, the month-specific PAYE calculation can over-deduct, though this should self-correct over the rest of the year.

National Insurance on bonuses works the same way. If your monthly pay is usually below the NI upper earnings limit (£50,270 annualised, or £4,189/month), a large bonus could push that month's NI calculation into the 2% band for the excess. Unlike income tax, monthly NI calculations are not reconciled annually for employees, so any over-deduction through the year's end is generally absorbed rather than refunded.

• Bonuses are taxed at your marginal income tax rate (20%, 40% or 45%).
• NI also applies at 8% or 2% on the bonus amount.
• Month-specific PAYE can create temporary over-deduction.
• Annual income tax is reconciled through PAYE; NI is not.

Why your bonus net payment is lower than expected

The most common surprise is when a bonus pushes total monthly pay into a higher band and the tax deduction on that single payslip looks punishing. Say your regular monthly salary is £3,500 (annualised: £42,000) and you receive a £6,000 bonus. Your employer annualises your pay for that month: (£3,500 + £6,000) × 12 = £114,000. PAYE then calculates tax on £114,000, including some in the 40% band, and deducts accordingly from that payslip.

The result is that your net bonus payment might be only £3,600 from a £6,000 gross payment, even though your actual annual income is £48,000 which is entirely in the basic rate band. The overpaid tax should come back through later payslips as PAYE recalculates the cumulative position, but the initial payslip shock is real.

If your employer uses a different method, sometimes called a fixed-percentage withholding rather than cumulative PAYE, the result can be different. Some smaller payroll systems may not handle large irregular payments perfectly, which is why checking your end-of-year P60 against what you expect is always worthwhile.

• Annualisation can temporarily put your bonus into a higher band.
• Over-deducted income tax usually recovers over the rest of the year.
• NI over-deduction on bonuses is not automatically refunded.
• Check your P60 at year end to confirm the final tax position.

Planning around bonuses: salary sacrifice and timing

Salary sacrifice pension contributions on bonus payments are one of the most effective ways to reduce the immediate tax hit. If your employer's scheme allows bonus sacrifice (not all do), directing part of a bonus into your pension reduces the amount subject to income tax and employee NI simultaneously. On a £5,000 bonus for a higher-rate taxpayer, a 100% salary sacrifice saves around £2,100 in combined income tax and NI.

Timing also matters if you are near a threshold. If you expect a bonus in the current tax year and are already close to £100,000 income, the bonus could trigger personal allowance tapering and push your effective rate to 60%. A pension contribution of equivalent size before the year end (or a salary sacrifice arrangement in advance) can neutralise this completely, but the planning needs to happen before payment.

For those not near a threshold, the best approach is usually to let the bonus land, accept the payslip month tax position, and confirm the annual reconciliation through PAYE. Any over-deduction should show up as a reduced tax deduction in subsequent months. If it does not clear by February or March, a call to HMRC is worth making.

• Salary sacrifice of bonus into pension saves both income tax and NI.
• Near £100k: plan pension contributions before the bonus lands to avoid the taper.
• Bonuses received near 5 April may not self-correct until after the new tax year.
• Keep the payslip for the bonus month, useful for reconciliation.