Bonus Tax Calculator UK 2026: Why Your Bonus Is Taxed at 60%

Bonus season is here. You've worked hard, the number looks good on paper, and then the payslip arrives and it's a lot less than you expected. You're not imagining it. Your bonus is almost certainly taxed at a higher effective rate than your regular salary, and if your total income crosses certain thresholds, the real rate can hit 60%.

This article explains exactly why that happens, which thresholds to watch, and what you can do about it before the money lands.

Why Your Bonus Hurts More Than You Expected

Most people assume a bonus is just extra salary, taxed the same way. It isn't.

Your regular salary spreads income across the full tax year, so PAYE roughly balances out month by month. A bonus lands in a single payslip. HMRC taxes it at your marginal rate for that pay period, which often means a higher rate applies in that month than your average rate across the year.

But the bigger issue isn't the mechanics of PAYE. It's the thresholds your total income crosses when a bonus is added.

How Bonus Taxation Actually Works in the UK

The PAYE Problem

When your employer pays your bonus through payroll, they apply PAYE based on your annualised income for that pay period. If your monthly salary is £7,000 and your bonus is £20,000, HMRC sees a single month where you've earned £27,000, which annualises to £324,000. Your employer withholds tax accordingly.

You'll get most of that back through self-assessment or PAYE reconciliation if your annual income is lower, but the cash flow hit is immediate.

The Three Tax Thresholds That Matter

In 2026, five thresholds determine how badly a bonus stings:

Threshold

What Happens When You Cross It

£50,270

You enter the 40% income tax band

£60,000

High Income Child Benefit Charge begins (1% per £200 over)

£80,000

Child Benefit fully repaid above this point

£100,000

Personal allowance starts tapering at 50p per £1

£125,140

Personal allowance is fully withdrawn

A bonus that pushes your adjusted net income across any of these lines costs you more than the headline tax rate suggests.

The 60% Rate: What It Is and Who It Hits

The 60% effective marginal rate is not a conspiracy theory. It's straightforward arithmetic.

Between £100,000 and £125,140, every extra £2 of income removes £1 of your personal allowance. You pay 40% income tax on the extra income, and you also pay 40% tax on the personal allowance you've lost. That's 40% + 20% (the tax on the lost allowance) = 60% effective rate on every pound earned in that band.

Add 2% National Insurance on top and the real rate is closer to 62%.

So if your base salary is £95,000 and you receive a £15,000 bonus, roughly £10,000 of that bonus sits in the £100k–£125,140 band. You keep about 38p of every pound in that zone.

That's not a rounding error. On a £10,000 bonus, you lose £6,200 to tax and NI.

Worked Examples: What Your Bonus Actually Costs You

Example 1: Salary £95k, Bonus £10k

• Total income: £105,000
• £5,000 of the bonus falls in the 40% band (£95k to £100k): tax cost £2,000
• £5,000 falls in the 60% effective rate band (£100k to £105k): tax cost £3,000
• NI on the full £10k at 2%: £200
• Total deducted from £10,000 bonus: approximately £5,200
• You keep: approximately £4,800

Example 2: Salary £100k, Bonus £15k

• Total income: £115,000
• Entire bonus sits in the 60% effective rate band
• Tax cost: approximately £9,000
• NI at 2%: £300
• You keep: approximately £5,700 from a £15,000 bonus

Example 3: Salary £58k, Bonus £5k

• Total income: £63,000
• Bonus pushes you £3,000 over the High Income Child Benefit Charge threshold of £60,000
• You lose 1% of Child Benefit for every £200 over £60,000, so £3,000 over means 15% of Child Benefit is clawed back
• If you receive the standard Child Benefit for one child (around £1,331/year), you lose around £200 in addition to 40% income tax on the full bonus
• Effective rate on the portion over £60k: above 40% once Child Benefit clawback is included

These numbers shift depending on your exact salary, pension contributions, and family situation. The only way to get your specific figure is to model it with your actual inputs.

Bonus Sacrifice Into Pension: The Main Way to Reduce the Hit

Bonus sacrifice is exactly what it sounds like. Instead of taking your bonus as cash, you ask your employer to pay some or all of it directly into your pension. This reduces your adjusted net income before tax is calculated.

The benefits stack up quickly:

• If you're in the 60% band: sacrificing £10,000 of bonus into your pension saves £6,000 in income tax and NI, and you keep the full £10,000 growing in your pension.
• If you're near £100k: sacrificing enough to bring adjusted net income below £100,000 restores your full personal allowance, worth £12,570 of tax-free income.
• If you have children aged 9 months to 2 years in funded childcare: dropping below £100,000 restores eligibility for the income-tested 30 Free Hours entitlement and Tax-Free Childcare (more on this below).

The mechanics are simple. You instruct your employer before the bonus is paid. Once it's in your payslip as cash, it's too late to sacrifice it. Timing matters.

One thing to check: your annual pension allowance. In 2026, the standard annual allowance is £60,000. If you've already made significant contributions, sacrificing a large bonus could breach the limit. You can carry forward unused allowance from the previous three tax years, but you need to know your numbers before you act.

Childcare Benefits: The Hidden Cost of a Bonus That Pushes You Over £100k

This is the part most people miss entirely.

If you have children aged 9 months to 2 years, the income-tested 30 Free Hours entitlement (worth approximately £6,000 per child per year) disappears if either parent's adjusted net income exceeds £100,000. Tax-Free Childcare — the 20% government top-up worth up to £2,000 per child per year — is also lost above this threshold and applies until the child turns 11. Once your child moves to the universal 15 Free Hours entitlement (from age 3), income no longer affects eligibility, so this particular cliff edge only applies during the earliest years.

A bonus that takes you from £98,000 to £108,000 doesn't just cost you 60% in tax on the £8,000 above £100k. It also costs you the income-tested childcare benefits for the entire tax year.

The combined loss on a £10,000 bonus for a parent with a child aged under 3 in funded childcare can exceed £12,000 when you add the tax hit and the lost benefits together. You'd have been better off not receiving the bonus at all, or sacrificing it into your pension.

Sacrificing as little as £8,000–£10,000 of a bonus to bring your ANI below £100,000 can restore the full childcare package — worth more than the sacrifice itself.

How to Calculate Your Real Bonus Tax Rate

Generic bonus tax calculators give you a rough number. They don't account for:

• Your specific salary and existing pension contributions
• Whether your bonus crosses multiple thresholds
• Childcare benefit eligibility changes
• Scottish income tax rates (which use a 6-band system with different thresholds)
• Carry-forward pension allowance from previous years

To get your actual number, you need to model your full income picture, including the bonus, against your current pension contributions and family situation.

TaxPilot does this in under 2 minutes. You enter your salary, bonus, pension contributions, and family details, and it calculates your true marginal rate, shows exactly which thresholds you cross, and tells you precisely how much pension sacrifice would save you. All calculations run locally in your browser, so no financial data is sent anywhere.

The free tier covers the core tax calculation and income breakdown. If you want the full £100k Tax Trap Decision tool, household scenarios, and multi-year planning, the Pro tier is £69/year.

FAQs

Is my bonus taxed at a higher rate than my salary?
Not technically, but effectively yes. Your bonus is taxed at your marginal rate — the rate that applies to the top slice of your income. If your salary already uses up the basic and higher rate bands, your bonus gets taxed at 40% or higher from the first pound. If it pushes you over £100,000, the effective rate on that portion is 60%.

Can I sacrifice my bonus into my pension to avoid tax?
Yes. If you arrange it with your employer before the bonus is paid, you can direct some or all of it into your pension as a salary sacrifice. This reduces your adjusted net income, which lowers your tax bill and can restore childcare benefits if you were over £100,000.

What is the 60% tax trap and does my bonus trigger it?
The 60% effective rate applies to income between £100,000 and £125,140. In this band, your personal allowance is withdrawn at 50p per £1, creating an effective 60% income tax rate (plus 2% NI). If your salary plus bonus exceeds £100,000, part of your bonus sits in this band.

Does a bonus affect my childcare benefits?
Yes, but only for the income-tested entitlements. If your adjusted net income exceeds £100,000, you lose eligibility for the 30 Free Hours entitlement (for children aged 9 months to 2 years) and Tax-Free Childcare (for children up to age 11). Once your child is 3 or older, the universal 15 Free Hours entitlement is not means-tested, so income no longer affects it.

What is the High Income Child Benefit Charge and when does it apply?
If your adjusted net income exceeds £60,000, you start repaying Child Benefit through your tax return. The charge is 1% of your Child Benefit for every £200 over £60,000. Above £80,000, you repay it all. A bonus that crosses this threshold adds this clawback on top of your income tax bill.

Can I use carry-forward to sacrifice a large bonus into my pension?
Yes. If you haven't used your full annual pension allowance in the previous three tax years, you can carry forward the unused amount. This lets you sacrifice a larger bonus without breaching the £60,000 annual allowance. You need to have been a member of a registered pension scheme in those years.

How do I find out exactly how much tax my bonus will cost me?
Use a tool that models your full income picture, not just the bonus in isolation. TaxPilot calculates your true marginal rate, threshold crossings, and pension sacrifice savings based on your specific salary, bonus, and family situation. It takes under 2 minutes and no data leaves your browser.

What to Do Before Bonus Season Ends

The window to act is narrow. Once your bonus is processed through payroll as cash, most of the optimisation options close. Pension sacrifice has to be arranged in advance.

Before your bonus lands, work out three things:

1. Your total income including the bonus — which thresholds does it cross?
2. Your current pension contributions — how much room do you have before hitting the annual allowance?
3. Your childcare situation — are you near £100,000 with children aged 9 months to 2 years in funded childcare, at risk of losing the 30 Free Hours or Tax-Free Childcare?

If you're earning between £90,000 and £130,000 and receiving a meaningful bonus, the difference between taking it as cash and sacrificing part of it into your pension can easily be £5,000 to £12,000 in combined tax and benefit savings.

Model your numbers at taxpilot.diy before you decide.