How Bonuses Are Taxed in the UK (2026/27)
Bonuses in the UK aren't taxed at a special "bonus rate" — but they can look like they are, because of how PAYE and National Insurance treat a sudden spike in one month's pay. This guide explains what's actually happening, and how to reduce the impact.
Model your own bonus alongside your regular salary with the UK Take-Home Pay Calculator, which shows a bonus-month vs normal-month comparison.
Contents
There's no separate "bonus tax rate"
A bonus is simply added to your salary for that pay period and taxed using the normal Income Tax bands (20%/40%/45%) and normal National Insurance rates (8%/2%) — there's no special higher rate that applies specifically to bonuses. What feels different is the timing: because it's a one-off spike in a single month's pay, PAYE's mechanics can make that month's deduction look disproportionately large.
Why the month it's paid looks so heavily taxed
PAYE calculates Income Tax cumulatively across the tax year by default. Each pay period, HMRC's system effectively asks: "based on total pay so far this year, what should total tax so far be?" — then deducts whatever's needed to catch up.
When a bonus arrives, that month's total pay is unusually high, so the system calculates tax as if you might earn at that elevated rate for the rest of the year — pushing some of the bonus into a higher marginal band for that pay period specifically. If your pay returns to normal the following month, the cumulative calculation usually self-corrects, and you'll often see slightly less tax deducted than normal for a month or two afterward, balancing things out. Over a full tax year with a stable base salary, the total Income Tax paid ends up the same whether the bonus were spread evenly or paid as a lump sum — it's a timing effect, not a permanent overpayment.
National Insurance doesn't correct itself the same way
This is the part that catches people out. Unlike Income Tax, National Insurance for most employees is calculated independently each pay period, not cumulatively. That means:
- A bonus added to one month's pay is charged NI at that period's marginal rate.
- Unlike Income Tax, there's no later correction — if the bonus pushes that month's NI-able pay through the 8%→2% threshold, part of it may be taxed at only 2% NI, which can actually work in your favour. But if it simply adds more pay within the 8% band, you pay the full 8% on it with no year-end smoothing either way.
In practice, this means the NI portion of a bonus's deduction genuinely does reflect what you actually owe for that pay period — it isn't a temporary overpayment like the Income Tax portion often is.
Worked example
Someone earning a £48,000/year base salary (£4,000/month) receives a £5,000 bonus in one month, taking that month's gross pay to £9,000 and their annual gross to £53,000. Comparing annual take-home with and without the bonus (standard tax code, 2026/27 rUK rates):
| Without bonus | With bonus | |
|---|---|---|
| Annual gross | £48,000 | £53,000 |
| Annual Income Tax | £7,086 | £8,632 |
| Annual National Insurance | £2,834 | £3,071 |
| Annual take-home | £38,080 | £41,297 |
The £5,000 bonus adds £3,218 to annual take-home pay — an effective deduction of about 36% on the bonus itself, noticeably higher than this person's overall average deduction rate (about 21% on the base salary alone), because £2,730 of the bonus spills over the £50,270 higher-rate threshold and is taxed at 40% instead of 20%. Spread over the year, that shows up as roughly £3,173 take-home in a normal month and about £6,391 in the bonus month. Use the take-home pay calculator's bonus comparison for your own exact figures — it uses this same annual-comparison method.
Reducing the tax hit with pension sacrifice
Many employers allow "bonus sacrifice" — directing some or all of a bonus straight into your pension via salary sacrifice, before it's ever paid as taxable income. Because it never counts as pay, it avoids Income Tax, employee NI, and often employer NI entirely on the sacrificed portion, in exactly the same way as ongoing salary sacrifice (see the Salary Sacrifice Pensions Explained guide). For anyone whose bonus pushes them into a higher tax band, over £100,000 (into the Personal Allowance taper), or over the Child Benefit charge threshold, this is often one of the most effective ways to blunt the impact.
If a bonus pushes you over a key threshold
A bonus can tip you over thresholds that don't apply at your base salary alone:
- Higher-rate threshold (£50,270): part of the bonus may be taxed at 40% instead of 20%.
- £100,000 Personal Allowance taper: if your salary plus bonus exceeds £100,000, you start losing Personal Allowance — see the £100,000 after tax breakdown and the Income Tax Explained guide for the 60% effective rate this creates.
- High Income Child Benefit Charge (£60,000–£80,000): a bonus that pushes adjusted net income into or through this range increases the amount of Child Benefit you need to repay.
In all three cases, the effect is based on your annual income, not just the one bonus month — so even though the deduction shows up all at once in your payslip, it's genuinely tied to crossing a real annual threshold, not an unfair one-off penalty.
FAQ
Is there a special "bonus tax rate" in the UK?
No — bonuses are taxed using the same Income Tax bands and National Insurance rates as regular salary. They just get added to your pay for that period, which can push part of that month's pay into a higher band.
Will I get overpaid tax back automatically?
For Income Tax, usually yes — PAYE's cumulative calculation tends to self-correct over the following months if your pay returns to normal, without you needing to do anything. National Insurance doesn't work the same way and generally isn't refunded through this mechanism.
Does a bonus affect my student loan repayment?
Yes — it's added to that period's income and repayments are calculated on the total, in the same non-cumulative way as National Insurance, so a bonus month typically means a noticeably larger student loan deduction that period.
Can I ask my employer to defer a bonus to next tax year?
Sometimes, depending on company policy — this can help if it would otherwise push you over an annual threshold you're close to, but it's entirely at your employer's discretion and not something you can require.
Is sacrificing my whole bonus into a pension a good idea?
It depends on your circumstances — it maximises the tax efficiency of that money, but it's no longer accessible as cash until pension age. It's most clearly worthwhile if the bonus would otherwise be taxed at 40%+ or trigger the Personal Allowance taper or Child Benefit charge.
More guides
This page is for general information only and does not constitute financial advice. Figures are correct for the 2026/27 tax year and are illustrative estimates. For your exact bonus month figures, use the take-home pay calculator.