That £2,000 bonus landed as barely £1,000 — and it feels like you’ve been punished for earning more. The truth is there’s no special “bonus tax”; it’s just your top slice of income, fully exposed.
There’s no separate bonus tax rate. A bonus is added on top of your salary and taxed at your marginal rate — the rate on your highest slice of income — plus National Insurance and any student loan. For a higher-rate taxpayer that’s 40% + 2% NI + 9% loan, which can swallow around half.
Sometimes a one-off bonus also triggers temporary emergency tax, which corrects itself later.
Getting a bonus and seeing half of it vanish is genuinely deflating — but it isn’t a penalty for bonuses. It’s simply what happens when extra money sits entirely on top of everything you already earn.
Your salary fills up the tax bands from the bottom: some is tax-free, some at 20%, then 40%, then 45%. A bonus arrives on top, so it’s all taxed at whatever band your top earnings sit in — your marginal rate. Nothing of the bonus gets the tax-free or 20% treatment, because your normal salary already used those up.
The bonus isn’t taxed more than your salary would be at that level. It just all sits in your highest band at once, so the deduction looks dramatic.
A one-off bonus can briefly confuse the PAYE system. Payroll often assumes you’ll earn that much every month, so it taxes the payslip as if you’d crossed into a higher band — called emergency tax. The good news: HMRC corrects it automatically over the following months, and you get the overpayment back through your pay.
Just under half lands in your account — not because bonuses are special, but because this £2,000 sits entirely in the 40% band with NI and student loan on top.
Add a bonus to your salary and watch the tax, NI, student loan and take-home update — including your true marginal rate.
You can’t dodge the tax, but you can redirect the bonus somewhere it’s not taxed now:
Pension sacrifice locks the money away until at least age 57. It’s brilliant for long-term saving, but make sure you don’t need the bonus for something sooner before redirecting it.
No. A bonus isn’t taxed at a special rate — it’s added to your income and taxed at your marginal rate. It feels heavier because the whole bonus sits at that top rate, with NI and student loan on top.
As a higher-rate taxpayer the bonus is taxed at 40% plus 2% NI, and 9% student loan if you have one — around 50% or more. A one-off bonus can also trigger temporary emergency tax that’s corrected later.
You can’t avoid it, but you can defer it tax-efficiently by paying it into your pension via salary sacrifice — avoiding Income Tax and NI now, and potentially reclaiming the personal allowance if you earn £100k–£125,140.
If you were overtaxed via emergency tax or your tax code, HMRC usually corrects it automatically through PAYE over the following months, or after year-end. You don’t normally need to claim, but check your code if it looks wrong.
This article is general information, not financial advice. It describes how UK tax generally works as at the 2025/26 tax year; your tax code, circumstances and the latest rules may differ. For decisions about your money, consider speaking to a qualified, regulated adviser.