Tax Bracket Calculator

A tax bracket calculator works out how much income tax you owe based on your taxable income and which marginal rate bands apply to each portion of your earnings. It is used by employed workers, self-employed individuals, and anyone planning their finances who wants to understand their effective tax rate versus their marginal tax rate. The tool removes the common misconception that moving into a higher bracket taxes all of your income at the higher rate.

How to Use the Tax Bracket Calculator

1. Select your country or tax system (for example, UK income tax, US federal income tax).
2. Enter your total taxable income for the year.
3. Select your filing status if applicable (for US filers: single, married filing jointly, etc.).
4. The calculator applies each marginal rate band in turn and shows the tax due in each bracket.
5. Review the total tax owed, your effective tax rate, and your marginal rate.

The Formula

Income tax is calculated progressively. Each bracket rate applies only to income within that band, not to your total income.

Tax = sum of (income within each band multiplied by that band's rate)

For UK income tax (2024/25):

Personal Allowance: first £12,570 at 0% Basic rate: income between £12,571 and £50,270 at 20% Higher rate: income between £50,271 and £125,140 at 40% Additional rate: income above £125,140 at 45%

Note: the personal allowance tapers by £1 for every £2 earned above £100,000, disappearing entirely at £125,140.

Effective Tax Rate = Total Tax Paid divided by Total Income, multiplied by 100

The effective rate is always lower than the marginal rate and represents the true average rate you pay across all your income.

Real-World Example

A UK employee earns £65,000 per year. Their income tax is calculated as follows.

First £12,570: £0 (personal allowance) Next £37,700 (£12,571 to £50,270): £37,700 multiplied by 20% = £7,540 Remaining £14,730 (£50,271 to £65,000): £14,730 multiplied by 40% = £5,892

Total income tax = £7,540 plus £5,892 = £13,432

Effective tax rate = £13,432 divided by £65,000 = 20.7%

Marginal tax rate = 40% (the rate on the last pound earned)

Although this person is a "higher-rate taxpayer," they pay an effective rate of only 20.7% on their total income. Understanding this distinction is important when evaluating pay rises, bonuses, or self-employment income. An extra £1,000 in earnings costs £400 in tax at the 40% rate, not £400 on the whole £65,000.

Marginal Rate vs Effective Rate

The marginal tax rate is the rate you pay on the next pound of income you earn. It is the key figure for planning decisions: should you take a pay rise, make additional pension contributions, or time a bonus payment? The marginal rate tells you the tax cost of earning more.

The effective tax rate is the overall percentage of income paid in tax across all bands. It is a useful summary of your total tax burden.

Pension contributions reduce your taxable income and can be particularly powerful for those near a threshold. A basic-rate taxpayer earning £55,000 who contributes £5,000 to a pension drops their higher-rate tax exposure by £5,000, saving £2,000 in additional-rate tax.

National Insurance contributions (UK) or payroll taxes (US) add to the total tax burden and are not included in income tax calculations but should always be considered alongside income tax when assessing the total cost of earning additional income.

Frequently Asked Questions

Does earning more always reduce my take-home pay? No. Moving into a higher tax bracket only applies the higher rate to income above the threshold, not to all income. So earning more always increases take-home pay, though the marginal increase slows at higher income levels. The exception in the UK is the £100,000 to £125,140 band, where the loss of the personal allowance creates an effective 60% marginal rate on that income, meaning a pay rise in that range is partly offset by a much higher tax bill.

What is the difference between income tax and National Insurance? Income tax is a charge on your earnings, assessed annually through HMRC. National Insurance (NI) contributions are a separate levy also collected by HMRC, which fund the state pension and certain benefits. Employees pay Class 1 NI on earnings above the primary threshold (£12,570 in 2024/25). The combined income tax and NI burden is much higher than income tax alone; most basic-rate taxpayers face a combined marginal rate of around 32%, not just 20%.

How do pension contributions reduce my tax bill? Contributions to a registered pension reduce your taxable income. A higher-rate taxpayer contributing £8,000 to a personal pension receives £2,000 in basic-rate relief at source (the pension receives £10,000), then claims an additional £2,000 through their tax return, making the net cost £6,000 for a £10,000 pension contribution. This 40% effective relief makes pension contributions extremely tax-efficient for higher earners.

Does the tax bracket calculator cover Scottish income tax? Scottish taxpayers pay different income tax rates set by the Scottish Parliament, with more bands than the rest of the UK. If you are a Scottish resident, you should use a calculator specific to Scottish income tax rates. The Scottish rates differ from England, Wales, and Northern Ireland rates starting at the starter rate band.

The personal allowance taper worked through

The taper is the part of the UK system that surprises people most, and it is worth running at a salary high enough to trigger it. Take an income of 110,000.

The personal allowance starts at 12,570. Income above 100,000 removes one pound of allowance for every two pounds earned, so the reduction is half of 10,000, which is 5,000. The allowance falls to 7,570 and taxable income is 110,000 minus 7,570, or 102,430.

The effective rate on the full 110,000 is 30.3927 percent. The marginal rate on the next pound is 60 percent, which the section below explains.

Where the taper ends and what it costs

The allowance reaches zero at 125,140, because that is where the reduction of 12,570 is complete. Every pound above that point is fully taxable.

The first row reproduces the worked example further up this page, which is a useful check on the method. Between 100,000 and 125,140 of income the tax bill rises by 15,712.50, which is 62.5 percent of the 25,140 of extra income. That is the taper working through: the tax charged on the income itself, plus the tax charged on the allowance being withdrawn.

Why the marginal rate is 60 percent in that band

An extra pound of income in the taper range does two things at once. It is taxed at the higher rate of 40 percent, which costs 40 pence. It also reduces the personal allowance by 50 pence, and that 50 pence of newly taxable income is taxed at 40 percent, which costs another 20 pence. The two effects together take 60 pence from each extra pound.

That is why a pay rise inside the band can feel disappointing, and why it is still worth taking. The other 40 pence stays with you, so taking the rise always leaves you better off. The 60 percent rate applies between 100,000 and 125,140 and nowhere else in the UK system. Pension contributions and Gift Aid donations both reduce adjusted net income, so either can pull income back below the threshold and restore part of the allowance.

The same salary in Scotland

Income tax on earnings is devolved, so the bands above apply in England, Wales and Northern Ireland. Scottish taxpayers pay different rates on non-savings and non-dividend income, and the structure has more bands.

Applied to the same 65,000 salary used in the example on this page:

The Scottish bill on 65,000 is 15,328.31 against 13,432.00 in the rest of the UK, a difference of 1,896.31. The effective rate is 23.5820 percent against 20.6646 percent. The marginal rate differs too: at this salary a Scottish taxpayer pays 42 percent on the next pound while a taxpayer in England pays 40 percent. The personal allowance is the same across the UK and the taper applies to Scottish taxpayers in the same way, since the allowance is reserved to Westminster rather than devolved.

The charges the figures exclude

The figures above are income tax only. National Insurance is a separate charge collected alongside it, and on an employed salary it adds several thousand pounds to the total. Dividends and savings interest follow UK-wide rates rather than the Scottish bands. The calculation assumes the standard personal allowance and does not include Marriage Allowance, Blind Person's Allowance, Gift Aid relief claimed through a return, or any income taxed at source. The bands used here are the ones in force since April 2024, and the main thresholds have been frozen since then, so the same table applies to later tax years unless Parliament changes them.

The published tables behind the bands

The rates, the band thresholds and the taper rule are taken from the UK government's published guidance at gov.uk under "Income Tax rates and Personal Allowances", which states the standard personal allowance of 12,570 and the reduction of one pound for every two pounds of adjusted net income above 100,000. The Scottish bands and rates are from the Scottish Government publication "Scottish Income Tax: rates and bands", 2024 to 2025, which lists the six bands used in the table above.

Also try these free tools:

• UK Income Tax Calculator
• Salary Calculator
• Tax Calculator