60 Tax Trap Calculator
Estimate how the UK personal allowance taper can create an effective 60% marginal income tax band between £100,000 and £125,140. Use this calculator to see your adjusted net income, lost personal allowance, estimated tax bill, and how pension contributions can reduce the trap.
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Expert guide to the 60 tax trap calculator
The phrase 60 tax trap usually refers to a specific feature of the UK income tax system: once your adjusted net income rises above £100,000, your personal allowance begins to disappear. For every £2 of income above £100,000, you lose £1 of personal allowance. Because the standard personal allowance is £12,570 for the 2024/25 tax year, it is fully removed once income reaches £125,140. In practical terms, that withdrawal of tax-free allowance causes many taxpayers to face an effective marginal tax rate of 60% on part of their income in the taper zone.
A 60 tax trap calculator helps you estimate how much of this hidden tax band affects you. It also shows why pension contributions and other adjusted net income deductions can be especially valuable when your income sits inside the taper range. If you are deciding whether to make an extra pension contribution, sacrifice part of a bonus, or plan year-end tax efficiency, a calculator like this can be a useful first pass before speaking to a qualified tax adviser.
What is the 60% tax trap?
At a headline level, many people assume that once they move into higher income levels they simply pay the 40% higher rate or the 45% additional rate on the relevant slice of income. But between £100,000 and £125,140, the personal allowance taper adds another layer. Here is the logic:
- You start with a standard personal allowance of £12,570.
- Once adjusted net income exceeds £100,000, the allowance falls by £1 for every £2 over the threshold.
- Each £1 of lost allowance becomes taxable income.
- If that extra amount is taxed at 40%, losing 50p of allowance for each extra £1 earned adds 20p of tax to the 40p already due.
- That creates an effective marginal rate of 60p on each extra £1 in the taper zone.
This is why the range is often described as a hidden 60% band. It is not a named statutory tax rate in the same way as the basic, higher, or additional rates, but for many people the combined effect feels exactly like one.
Why a calculator matters
Without a calculator, the taper is easy to underestimate. A salary increase, one-off bonus, deferred compensation payment, or self-employment profit can push adjusted net income above £100,000 without you immediately realising the knock-on effect. Likewise, a pension contribution made before the end of the tax year can pull adjusted net income back down and restore some personal allowance.
A strong 60 tax trap calculator should answer the questions most people actually care about:
- What is my adjusted net income?
- How much personal allowance have I lost?
- What is my estimated income tax bill?
- How much tax could I save by making an additional pension contribution?
- Am I fully out of the trap, partly in it, or completely above it?
This page is built around those practical questions. It is especially useful for employees with bonus income, business owners paying themselves through salary, and professionals whose compensation fluctuates from year to year.
How the calculation works
The calculator uses the personal allowance taper for the 2024/25 tax year. It starts with gross employment income and subtracts amounts you enter that reduce taxable pay or adjusted net income, such as eligible pension contributions. It then estimates your personal allowance as follows:
- If adjusted net income is £100,000 or below, personal allowance stays at £12,570.
- If adjusted net income is between £100,000 and £125,140, personal allowance is reduced by half of the excess over £100,000.
- If adjusted net income is £125,140 or more, personal allowance is reduced to £0.
Once the allowance is known, taxable income is calculated and then run through the relevant income tax bands for the selected regime. For England, Wales, and Northern Ireland, the 2024/25 non-savings, non-dividend rates are generally:
| Band | Taxable income range | Rate | Comment |
|---|---|---|---|
| Personal allowance | First £12,570 if available | 0% | Withdrawn once adjusted net income exceeds £100,000 |
| Basic rate | Next £37,700 | 20% | Usually covers taxable income from £12,571 to £50,270 |
| Higher rate | From £50,271 to £125,140 | 40% | The 60% effective trap usually appears inside this area |
| Additional rate | Above £125,140 | 45% | Applies after the taper has fully removed the allowance |
Scotland has different tax bands for non-savings and non-dividend income, which is why the calculator includes a separate Scotland option. The taper itself still matters there because it controls how much of your income remains sheltered by the personal allowance.
Real numbers: why the taper hurts
To see the issue in plain English, imagine a taxpayer in England with no pension contributions and no other deductions. If their income rises from £100,000 to £110,000, the standard logic says they are already in the higher rate band, so perhaps they expect the extra £10,000 to be taxed at 40%. In reality, they also lose £5,000 of personal allowance because they are £10,000 above the taper threshold. That lost allowance adds another £5,000 to taxable income. The result is an extra tax charge of 40% on £15,000, which equals £6,000. On a £10,000 increase in gross income, that is an effective 60% marginal rate.
This is one reason financial planners often pay special attention to the £100,000 to £125,140 range. It can be one of the least efficient slices of employment income for many professionals, especially when combined with other costs such as childcare support withdrawal or student loan deductions.
| Adjusted net income | Personal allowance available | Allowance lost | Effective issue |
|---|---|---|---|
| £100,000 | £12,570 | £0 | No taper yet |
| £105,000 | £10,070 | £2,500 | Partly inside the tax trap |
| £110,000 | £7,570 | £5,000 | Large chunk taxed at an effective 60% |
| £120,000 | £2,570 | £10,000 | Most of the allowance has gone |
| £125,140 | £0 | £12,570 | Allowance fully removed |
Adjusted net income explained
One of the most important concepts in any 60 tax trap calculator is adjusted net income. This is not always the same as the gross salary figure on your contract. HMRC uses adjusted net income to determine whether your personal allowance should be reduced. Depending on your circumstances, adjusted net income may be lower than gross income because of certain pension contributions or Gift Aid donations. It can also differ if you have other taxable sources of income beyond employment.
In broad terms, adjusted net income usually starts with your taxable income and then allows certain deductions. Common examples that can reduce it include:
- Pension contributions made through salary sacrifice or a net pay arrangement
- Grossed-up Gift Aid donations
- Some trade union or professional subscription reliefs in relevant cases
Because definitions can become technical, particularly where relief at source pensions or mixed income sources are involved, the calculator should be treated as a decision support tool rather than a formal tax filing engine.
How pension contributions can help
For many higher earners, the most useful planning move inside the taper zone is an additional pension contribution. This is not magic and it is not free money, but it can be very tax efficient. If an extra pension contribution reduces adjusted net income from £110,000 to £100,000, you are not only reducing taxable pay, you are also restoring the full personal allowance. That means the contribution can relieve income tax at a rate that feels much more valuable than the headline basic or higher rate alone.
That is exactly why this calculator includes an extra pension contribution to model input. It compares your current estimated tax position with a scenario where you make an additional contribution. This can help answer questions like:
- How much tax might I save if I contribute another £5,000?
- Would a bonus sacrifice reduce my effective tax rate?
- How close am I to restoring my full personal allowance?
- What contribution amount would move me below £100,000 adjusted net income?
Who should use a 60 tax trap calculator?
This type of calculator is especially relevant if any of the following apply to you:
- Your total income is likely to be between £100,000 and £125,140.
- You receive annual bonuses, commission, RSUs, or variable compensation.
- You are deciding whether to increase pension contributions before 5 April.
- You are a company director with flexibility over salary timing.
- You want to estimate whether your take-home pay is being eroded more than expected.
It is also useful if you are already above £125,140. Even though the personal allowance is already gone at that point, planning contributions can still affect your overall tax position and long-term retirement funding.
Important planning limitations
No online calculator can capture every tax nuance. Here are a few areas where real-life outcomes can differ from a simple estimate:
- National Insurance: This calculator focuses on income tax and the allowance taper, not employee or employer National Insurance.
- Savings and dividends: Different rates and allowances apply to dividend and savings income.
- Relief at source pensions: The practical mechanics differ from salary sacrifice and net pay arrangements.
- Child Benefit and childcare rules: Other thresholds can create additional effective marginal rates.
- Scottish bands: Scotland has multiple rates and thresholds that can alter the overall picture.
For these reasons, a calculator should be viewed as an informed estimate. If a decision involves a large bonus, major pension funding, or multiple income sources, specialist advice is sensible.
Where to verify the official rules
Authoritative guidance matters, particularly when planning close to threshold levels. You can verify current tax rates, allowance rules, and adjusted net income guidance from official sources including:
- UK Government income tax rates and bands
- HMRC guidance on adjusted net income
- London School of Economics for broader research and commentary on tax policy and incentives
Practical examples of using the calculator
Suppose your salary plus bonus total £118,000 and you make no pension contribution. The calculator will likely show that you have lost a large part of your personal allowance. If you then test an extra £18,000 pension contribution, your adjusted net income could fall to £100,000. In that revised scenario, the full personal allowance may be restored. The tax reduction can be substantial, which often makes the pension contribution more attractive than it first appears.
Another example is a professional expecting a year-end bonus that takes income from £98,000 to £107,000. At first glance, the bonus may seem straightforward. But once the taper applies, a significant part of that extra compensation can be lost to tax. Running the numbers in advance can support better conversations with payroll, HR, or a financial planner about pension salary sacrifice options.
Key takeaways
- The 60 tax trap is driven by the withdrawal of the personal allowance above £100,000 adjusted net income.
- The taper removes £1 of allowance for every £2 of income over the threshold.
- For many taxpayers, that creates an effective 60% marginal income tax rate between £100,000 and £125,140.
- Pension contributions can be particularly powerful because they may reduce adjusted net income and restore lost allowance.
- A calculator helps you understand the scale of the issue before making planning decisions.
If your income is near or inside the taper zone, small planning changes can have outsized effects. That is exactly why a 60 tax trap calculator is valuable: it turns an obscure tax rule into a practical forecast you can act on.