The Hidden Tax Trap on Bonuses: How a £10,000 Bonus Can Leave You With Just £2,900

Can you imagine receiving a £10,000 bonus and only seeing £2,900 hit your account? For many professionals in the UK, particularly those earning between £100,000 and £125,140, this is a frustrating reality. In this blog, we'll break down why this happens, what the "62–71% tax trap" is, and how you can legally avoid it.

Understanding the 62–71% Tax Trap

The UK tax system includes a lesser-known but incredibly costly mechanism: the gradual removal of your personal allowance once your income exceeds £100,000.

Between £100,000 and £125,140, your personal allowance is reduced by £1 for every £2 you earn. Since the full personal allowance is £12,570, this tapering creates an effective 60% marginal tax rate in that band.

And that’s before National Insurance or student loan repayments are even factored in.

Breaking Down the Numbers

Let’s say you receive a £10,000 bonus that pushes your income into the personal allowance tapering zone. Here's how your bonus could be taxed:

Income tax at 60%: £6,000

National Insurance (Class 1 at 2%): £200

Student Loan repayment (Plan 2 at 9%): £900

Total deductions: £7,100Net bonus received: £2,900

That’s a 71% effective tax rate.

Who Does This Affect?

This isn’t a niche problem. It’s affecting thousands of professionals every year across:

Finance

Law

Consulting

Tech

Senior public sector roles

Medical and dental professionals

Anyone who receives bonuses, promotions, or overtime that tips them just above £100K can fall into this trap.

How to Legally Reduce the Impact

The good news is there are ways to plan around this:

1. Pension ContributionsContributing to a pension scheme reduces your taxable income. A well-timed contribution can bring your adjusted income below the threshold and restore some or all of your personal allowance.

2. Salary Sacrifice SchemesIf your employer offers salary sacrifice options (for pensions, childcare, or other benefits), using them effectively reduces your reported income.

3. Gift Aid DonationsCharitable donations through Gift Aid extend your personal allowance when reported on a self-assessment tax return.

4. Spread Income Across Tax YearsWhere possible, timing income (bonuses, dividends, or consulting work) across different tax years can help keep you below the critical thresholds.

Final Thoughts

The UK tax system doesn’t just tax what you earn – it penalises how you earn it.

Bonuses, incentives, and hard work should be rewarded, not punished. If you’re earning around or just over £100,000, it’s vital to get proactive about tax planning.

Because in this case, ignorance isn’t just costly – it’s 71% costly.