Beat the 100k tax trap
Hitting the £100,000 income milestone is exciting, but in the UK, it can also trigger one of the harshest tax pitfalls; the £100K tax trap. Without careful planning, income between £100,000 and £125,140 can be effectively taxed at 60%, thanks to the gradual loss of your Personal Allowance!
Everyone gets a tax-free Personal Allowance each year, but once your Adjusted Net Income (ANI) exceeds £100,000, HMRC starts withdrawing it. For every £2 you earn above the threshold, £1 of allowance disappears. By £125,140, it’s gone completely.
ANI includes salary, bonuses, dividends, rental income, taxable benefits, and pension income, minus certain deductions such as gross pension contributions, Gift Aid donations, and trading losses. These deductions are where the smart planning comes in.
Pension contributions are the most powerful tool to reduce ANI. Salary sacrifice strengthens this approach; your employer should pay into your pension instead of giving you salary, reducing taxable income and both employee and employer National Insurance contributions. You can also use unused pension allowances from the previous three tax years for one-off large contributions.
Gift Aid can also reduce ANI. HMRC grosses up donations (e.g., a £12,000 donation counts as £15,000 for tax purposes), which may restore your Personal Allowance and extend the basic rate band.
So how do you beat the trap? You need a structured approach;
- Project your total income for the year.
- Calculate ANI and see how far over £100,000 it is.
- Use pensions, salary sacrifice, and Gift Aid to bring ANI down.
- Review and adjust annually.
The £100K tax trap can hit unexpectedly from bonuses, dividends, or profit shares, but it’s manageable. Pension contributions remain the most effective way to restore lost allowances and reduce tax. With careful planning, you can protect your income, make full use of reliefs, and keep more of what you earn. Give Rustrick Accountants a call on 01622 738165 today and we will start planning for you, so all you have to do is enjoy the benefits










