This free Tax Calculator UK estimates your income tax liability for the 2026/27 tax year. It applies the official HMRC rates and bands for England, Wales, Northern Ireland and Scotland, and clearly shows you which tax year the results apply to.

Our tax calculator UK tool uses three simple inputs:

Annual income: Your gross income before tax and deductions.
Tax year: The year you want to calculate — 2026/27 is the current year, but historical years are also supported.
Region: Scottish taxpayers pay different rates and bands to the rest of the UK.

Every result shows the tax year, the region selected, and a full breakdown of how the total was calculated.

Who this tax calculator UK tool is for

This tool is designed for UK employees, self-employed workers, contractors, and anyone who wants a quick estimate of their income tax liability before completing a Self Assessment or checking their payslip. It covers all four UK regions and eight tax years.

How UK Income Tax Is Calculated

UK income tax is calculated in progressive bands. Only the portion of income within each band is taxed at that band's rate — not the whole of your income. The steps are:

Step 1: Apply the Personal Allowance (£12,570 for 2026/27). Income up to this amount is taxed at 0%.
Step 2: Tax the remainder at the basic rate (20% for England/Wales/NI).
Step 3: Tax the next portion at the higher rate (40%).
Step 4: Tax anything above the additional rate threshold at 45%.

Total Tax = Σ (Income in each band × band rate)

UK Income Tax Rates and Bands for 2026/27

The following rates apply to England, Wales and Northern Ireland. Thresholds have been frozen since April 2021 and are confirmed frozen through 2030/31 — a policy often described as "frozen thresholds" or "fiscal drag".

Band	Taxable income (after Personal Allowance)	Rate
Personal Allowance	Up to £12,570	0%
Basic rate	£12,571 – £50,270	20%
Higher rate	£50,271 – £125,140	40%
Additional rate	Over £125,140	45%

Scottish taxpayers pay different rates — see the table below. The personal allowance is the same (£12,570) across the UK.

Scottish Band	Taxable income	Rate
Starter rate	£0 – £3,967	19%
Basic rate	£3,968 – £16,956	20%
Intermediate rate	£16,957 – £31,092	21%
Higher rate	£31,093 – £62,430	42%
Advanced rate	£62,431 – £125,140	45%
Top rate	Over £125,140	48%

Source: HMRC published rates, correct as of tax year 2026/27. See the official GOV.UK income tax rates page and the Scottish income tax page for confirmation.

Personal Allowance and the High-Income Taper

The standard Personal Allowance is £12,570. It is reduced by £1 for every £2 of adjusted net income above £100,000, reaching £0 once your income hits £125,140. That means, in the range between £100,000 and £125,140, income effectively faces a marginal rate of 60% — the combination of the 40% higher-rate tax plus the 20% loss of allowance.

Marginal vs Effective Tax Rate

These two figures are often confused, but they measure completely different things:

Marginal tax rate: The rate that applies to your next pound of income. If you are on £45,000, your marginal rate is 20% — the basic rate.
Effective tax rate: The average rate you pay across all your income. It's always lower than your marginal rate (unless you are entirely in the basic rate band).

For example, someone earning £50,270 pays £7,540 in income tax — an effective rate of roughly 15%. Their marginal rate is 20% at that point, but because the first £12,570 is tax-free, the average is lower.

Step-by-Step UK Tax Example (£45,000 Income)

Example: £45,000 income, 2026/27, England/Wales/NI, no other income.

Personal Allowance: £12,570 (0% tax)
Taxable income: £45,000 − £12,570 = £32,430
Basic rate tax: £32,430 × 20% = £6,486
Total income tax: £6,486
Marginal rate: 20%
Effective rate: £6,486 ÷ £45,000 = 14.4%

Are UK Tax Thresholds Frozen?

Yes. Most UK income tax thresholds and the Personal Allowance have been frozen at their 2021/22 levels. This was confirmed in successive Budgets and extended through April 2031. The practical effect is that as wages grow, more people are pulled into higher bands even though the rates themselves haven't changed — a phenomenon known as fiscal drag or bracket creep. This is why some people find their tax bill rising even without a tax rate increase.

Common Mistakes When Working Out Your Tax

Assuming the higher rate applies to all your income: Only income above the higher-rate threshold is taxed at 40%.
Forgetting the Personal Allowance taper: Above £100,000, your allowance is reduced — raising your effective tax rate.
Confusing marginal and effective rate: They are not the same number.
Ignoring regional differences: Scottish rates differ from the rest of the UK.
Not accounting for National Insurance: NI is separate from income tax and follows different thresholds.
Using the wrong tax year: Thresholds and rates change annually.

Frequently Asked Questions

What is my UK tax rate? +

How do I calculate my effective tax rate? +

What is a marginal tax rate? +

What tax band am I in? +

What is the UK Personal Allowance for 2026/27? +

Does Scotland have different income tax rates? +

Does entering a higher tax band mean all my income is taxed at the higher rate? +

Are UK tax thresholds frozen? +

Can I calculate tax for previous tax years? +

Why is my effective tax rate lower than my marginal tax rate? +

Does this calculator include National Insurance? +

How we calculate this

This calculator applies the UK income tax rates and thresholds published by HMRC for the tax year you select. The Personal Allowance, band thresholds, and rates are stored in a structured configuration that is updated whenever HMRC announces changes. The calculator does not model National Insurance, student loan repayments, pension salary sacrifice, savings income, dividends, or benefits in kind. Results are estimates and are shown for the tax year and region you select.

Latest UK Tax Guides

In-depth guides explaining how UK tax works — written to complement the calculators above.

How UK Income Tax Is Calculated

A plain-English walkthrough of how each tax band works, with real examples.

Read guide →

Marginal vs Effective Tax Rate Explained

Why your average rate is always lower than your top rate — and when that matters.

Read guide →

Are UK Tax Thresholds Frozen?

What frozen thresholds mean for your take-home pay through to 2031.

Read guide →

Scotland vs England Income Tax Compared

How the Scottish bands differ, and who pays more or less.

Read guide →

About FastCalculator.co.uk

FastCalculator.co.uk is an independent online calculator website providing free, UK-focused tools for tax, salary, savings, loans and everyday maths. Our UK tax calculators are used by employees, contractors, self-employed workers and anyone who wants a quick, clear estimate of their tax position before speaking to an accountant or completing a Self Assessment.

We are not affiliated with HMRC, the UK Government, or any tax authority. All calculators are provided for estimation purposes only. Our editorial policy is straightforward: we cite the official source for every rate we use, update tools when the underlying rules change, and clearly state what our calculators do and do not model.

If you find an error or would like to suggest a new calculator, please get in touch.

Contact Us

Questions, corrections, or feedback about our UK tax calculators? We read every message. The fastest way to reach us is by email:

General enquiries: contact@fastcalculator.co.uk
Corrections and factual errors: please include the page URL and the specific figure you believe is incorrect.
Business and partnerships: use our contact form.

We aim to respond within 2 working days. For personalised tax advice, please consult a qualified accountant — we are not able to provide individual tax guidance.

Your Privacy

FastCalculator.co.uk is designed to work without collecting personal information. Key points:

Calculations run in your browser. Any income, salary, or other figures you enter into our calculators are processed entirely client-side in JavaScript. They are never transmitted to or stored on our servers.
No account required. You do not need to register, log in, or provide an email address to use any calculator on this site.
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Your rights. As a UK visitor, you have rights under the UK GDPR, including the right to access, correct, or delete any personal data we hold. Because we do not collect calculator inputs, this is generally limited to analytics data.

Read our full Privacy Policy and Cookie Policy for details.

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By using FastCalculator.co.uk you agree to the following terms in summary form:

All tools are provided "as is" and "as available" without warranties of any kind.
We reserve the right to change, suspend, or remove any calculator at any time without notice.
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Disclaimer

All calculators and content on FastCalculator.co.uk are provided for general informational and estimation purposes only. They do not constitute financial, tax, legal, or professional advice, and should not be relied upon as a substitute for consultation with a qualified accountant or tax adviser.

Our UK tax calculators use rates and thresholds published by HMRC for the tax year you select. While we make reasonable efforts to ensure accuracy and to update our tools when rates change, we cannot guarantee that every figure is free from error or that it reflects your specific circumstances. Your actual tax position may differ based on your tax code, National Insurance contributions, student loan repayments, pension arrangements, benefits in kind, savings and dividend income, residency status, and other factors not modelled by the calculator.

We are independent and are not affiliated with HMRC, the UK Government, or any regulatory body. For authoritative tax information, always refer to the official pages on GOV.UK.

Read our full disclaimer, privacy policy, and terms & conditions.

Who Writes FastCalculator

FastCalculator.co.uk is maintained by a small editorial team led by Abdul Wahid, who writes on UK tax, salary, and personal finance. Every tax calculator on this site is checked against the latest published HMRC rates before release, and reviewed again whenever HMRC announces changes (typically at the Autumn Budget or Spring Statement).

We do not present ourselves as tax advisers or chartered accountants. Our role is to build clear, well-sourced calculators that help UK users understand their likely position — not to replace professional advice.

For corrections, questions, or to suggest a new calculator, see Contact Us.

Reviewed against HMRC published rates by the FastCalculator Tax Editorial Panel

All UK tax calculators on FastCalculator are checked against the latest published HMRC rates and thresholds for the relevant tax year. Content is reviewed and updated when HMRC announces new rates.