Reaching a £100,000 salary is a major career milestone. But once your income crosses this threshold, the UK tax rules change — and not always in your favour.
If you earn over £100,000, you are required to file a Self Assessment tax return, even if most of your tax is already deducted through PAYE and you’ve never needed to file before.
More importantly, this is where the 60% effective tax rate comes into play.
What Actually Happens When You Earn Over £100,000?
For every £1 you earn above £100,000, you begin to lose your Personal Allowance.
- The standard Personal Allowance is £12,570
- It reduces by £1 for every £2 earned over £100,000
- Once your income reaches £125,140, your Personal Allowance is completely gone
This mechanism creates what’s commonly referred to as the 60% tax trap.
Why Is It Called the 60% Tax Rate?
Although the headline higher-rate tax is 40%, the withdrawal of your Personal Allowance means part of your income is effectively taxed twice:
- You pay 40% income tax
- You also lose tax-free income you would reported otherwise have received
The result is an effective tax rate of 60% on income between £100,000 and £125,140.
A Real-Life Example
Let’s make this simple.
Olivia earns £100,000 from her job. After a strong year, she receives a £10,000 pay rise, taking her salary to £110,000.
Here’s what happens:
- The £10,000 is taxed at 40% → £4,000 tax
- For every £2 earned over £100,000, she loses £1 of her Personal Allowance
- £10,000 over the threshold = £5,000 Personal Allowance lost
- That £5,000 is now also taxed at 40% → £2,000 additional tax
Total tax on the £10,000 pay rise:
- £4,000 + £2,000 = £6,000
- That’s an effective 60% tax rate
Do You Have to Pay It?
Yes — the tax rules are the tax rules.
But what matters is how efficiently you pay tax, not whether you can avoid it altogether.
With the right planning, many people earning over £100,000 can reduce or eliminate the 60% trap legally.
How Can You Reduce the 60% Tax Trap?
Here are the most common and effective strategies:
1. Pension Contributions
Personal pension contributions reduce your adjusted net income, which is the figure used to calculate your Personal Allowance.
This can:
- Restore lost Personal Allowance
- Reduce higher-rate tax
- Provide long-term retirement benefits
2. Gift Aid Donations
Charitable donations made under Gift Aid:
- Reduce adjusted net income
- Extend your basic-rate tax band
- Can be extremely powerful for those between £100k–£125k
3. Tax-Efficient Investments
Certain government-backed investments offer income tax relief, including:
- SEIS
- EIS
- Venture Capital Trusts (VCTs)
These are higher-risk and should always be considered carefully.
4. Non-Cash Employee Benefits
Instead of a pay rise, you may negotiate benefits such as:
- Employer pension contributions
- Private medical insurance
- Childcare support
- Cycle-to-work schemes
- Additional annual leave
- Professional training
These can improve your overall compensation without worsening your tax position.
5. Salary Negotiation Strategy
Some employers are willing to gross-up pay rises once employees cross £100,000 to offset the tax impact.
It’s worth having the conversation.
Why Self Assessment Matters at £100,000+
Once you cross £100,000:
- HMRC requires a Self Assessment tax return
- PAYE alone is no longer sufficient
- Missed filings can lead to penalties and interest
- Opportunities for tax efficiency are often missed without proper planning
