How the 40% Tax Trap Works — and Three Ways to Avoid It

The 40% higher-rate income tax band kicks in at £50,270 — a threshold frozen since April 2021. With wages rising through inflation and pay rises, millions of workers are crossing into higher-rate territory without ever receiving a windfall that might justify it. Here is how the trap works and how to legitimately avoid it.

How the 40% Band Works

Once your taxable income exceeds £50,270, every additional pound you earn costs you 40p in income tax (plus 2% in employee National Insurance above the Upper Earnings Limit). For every £1,000 pay rise above this threshold, you take home only £580.

The threshold includes all taxable income: salary, bonuses, rental income, self-employment profits and interest above your savings allowance. It is surprisingly easy to tip over if you receive an irregular bonus.

The Child Benefit Trap Within the Trap

If you or your partner claim Child Benefit and either of you earns above £60,000, you begin to repay it through the High Income Child Benefit Charge (HICBC). You repay 1% of Child Benefit for every £200 earned above £60,000, with full repayment at £80,000.

At £60,000 with two children, Child Benefit is worth around £2,133 per year. Every pound you earn above £60,000 effectively costs you 40% income tax + 2% NI + gradual Child Benefit clawback — making the effective marginal rate on income between £60,000 and £80,000 significantly above 40% for parents.

The Personal Allowance Taper

There is a further trap between £100,000 and £125,140. Your Personal Allowance is reduced by £1 for every £2 you earn above £100,000. This means income in this band is effectively taxed at 60% (40% on the income itself, plus 20% on the allowance lost).

This is why financial planners often recommend that anyone earning between £95,000 and £130,000 should consider making pension contributions specifically to bring their adjusted net income below £100,000.

Three Ways to Reduce Your Exposure

1. Salary Sacrifice Pension Contributions

This is the most powerful tool. Every pound contributed via salary sacrifice reduces both your gross pay and your taxable income. If your gross pay is £55,000 and you salary sacrifice £5,000 into your pension, your taxable income falls to £50,000 — bringing you back into the basic-rate band.

The saving: you avoid 40% income tax and 2% NI on the sacrificed amount. On £5,000, that is £2,100 in combined savings. You pay only £2,900 net to put £5,000 into your pension.

2. Gift Aid Donations

If you make charitable donations under Gift Aid, your adjusted net income (the figure used to assess which bands apply) is reduced by the gross value of donations. A £800 cash donation becomes a £1,000 gross donation via Gift Aid. If you are a higher-rate taxpayer, you claim back 20% of the gross donation (£200) through Self Assessment.

This does not reduce your headline salary, but it does reduce the income on which higher-rate tax is calculated.

3. Personal Pension Contributions

Contributions to a personal pension (SIPP) work similarly to Gift Aid. You pay in net of basic-rate tax, and the provider claims 20% relief. As a higher-rate taxpayer, you then claim the additional 20% via Self Assessment, effectively making each £60 you contribute worth £100 in your pension pot.

Unlike salary sacrifice, personal pension contributions do not save you NI — but they are useful if your employer does not offer salary sacrifice, or if you want to top up beyond your workplace pension.

Is It Worth Doing?