These common mistakes cost UK high earners thousands of pounds every year. The good news: they are all easily fixable.
If you earn between £100,000 and £125,140, you are paying an effective 60% marginal tax rate. For every extra pound in this band, you keep only 40p. Most people have no idea this exists because it does not appear as a named tax band.
The fix: Use pension contributions or salary sacrifice to bring your adjusted net income below £100,000. This fully restores your £12,570 personal allowance. Our trap analysis tool shows your exact exposure and how much you can save.
When you make a personal pension contribution, your provider claims 20% basic rate relief automatically. But if you pay 40% or 45% tax, you are owed the extra relief — and HMRC does not chase you for it. You have to claim it yourself through self-assessment or by calling HMRC.
The fix: Either file a self-assessment return (required anyway if you earn over £150,000) or call HMRC to adjust your tax code. The difference between 20% and 40% relief on a £10,000 contribution is £2,000 — real money. See our pension tax relief guide for step-by-step instructions.
The annual pension allowance is £60,000, but if you did not use it all in the previous three tax years, you can carry the unused amount forward. Many people assume they can only contribute £60,000 when they could contribute £120,000 or even £180,000.
The fix: Check your pension provider statements for the last 3 years. Add up your total contributions (including employer). Any unused allowance can be added to this year's limit. This is especially useful for one-off events like a large bonus, share vesting, or selling a business. Our retirement planner can help you model larger contributions.
Personal pension contributions save income tax but not National Insurance. Salary sacrifice saves both. For a higher-rate taxpayer contributing £20,000, the difference is around £400-£1,600 per year depending on income level — potentially over £10,000 across a career.
The fix: Ask your employer if they offer salary sacrifice for pension. Most large employers do. It is a simple contractual change. Some employers also pass on their own NI saving to your pension, adding another 13.8% on top. See our salary sacrifice guide and use the strategies tool to compare the savings.
Many higher-rate taxpayers tick the Gift Aid box when donating to charity but forget to claim the extra relief. The charity gets 25% on top of your donation, and you can claim the difference between your rate and 20% via self-assessment.
The fix: Keep records of all Gift Aid donations and include them on your tax return. A £1,000 donation to charity costs a 40% taxpayer only £500 after all reliefs are claimed. Additionally, Gift Aid extends your basic rate band, which can help reduce your adjusted net income. Enter your donations in our calculator to see the impact.