Tax Rate Calculator UK
Tax Rate Calculator UK
What Is a Tax Rate Calculator?
A tax rate calculator helps you find your marginal tax rate, effective tax rate and tax bracket. This tax rate calculator UK shows you how much tax you pay on each pound of income and your average tax rate across all income.
How to Use the Tax Rate Calculator
Enter your annual income, select your tax region (England/Wales/Northern Ireland or Scotland), and enter your tax code. Click Calculate Tax Rate to see your marginal rate, effective rate and a visual breakdown of how your income is taxed.
What Is Marginal Tax Rate?
Your marginal tax rate is the rate of tax you pay on your next £1 of income. It's your highest tax bracket. For example, if you're in the Higher Rate band, your marginal rate is 40% — each additional pound you earn is taxed at 40%.
What Is Effective Tax Rate?
Your effective tax rate is the average rate of tax you pay across all your income. It's calculated by dividing your total tax by your total income. This is usually lower than your marginal rate because part of your income is tax-free.
How Tax Rates Are Calculated
Effective Rate = (Total Tax / Total Income) × 100
Tax Rate Example
Example: Annual income of £45,000 (England/Wales, 2025/26)
- Personal Allowance: £12,570 (0% tax)
- Basic Rate: £25,130 × 20% = £5,026
- Higher Rate: £7,300 × 40% = £2,920
- Marginal Rate: 40%
- Effective Rate: 17.7% (£7,946 / £45,000)
Why Marginal Rate Matters
- Tax planning — knowing your marginal rate helps with financial decisions
- Pay rises — understand how much of your pay rise goes to tax
- Salary sacrifice — see how sacrificing salary affects your tax
- Investment income — understand the tax on savings and dividends
Why Effective Rate Matters
- Overall picture — shows your actual average tax burden
- Comparison — compare your tax burden with others
- Financial planning — understand your total tax liability
Marginal vs Effective Rate Example
Comparison: Different income levels showing both rates
- £30,000: Marginal 20% · Effective 11.6%
- £45,000: Marginal 40% · Effective 17.7%
- £60,000: Marginal 40% · Effective 21.3%
- £100,000: Marginal 40% · Effective 27.9%
- £150,000: Marginal 45% · Effective 34.5%
Scotland vs England Tax Rates
Scottish Income Tax rates are different from the rest of the UK. Scotland has more tax bands: Starter (19%), Basic (20%), Intermediate (21%), Higher (42%), Top (48%). This calculator shows rates for both regions.
Common Tax Rate Misconceptions
- Myth: "I pay 40% tax on all my income."
- Fact: Only income above the threshold is taxed at 40%.
- Myth: "My effective rate is the same as my marginal rate."
- Fact: Effective rate is lower because of tax-free allowance and lower bands.
- Myth: "I shouldn't earn more because I'll pay more tax."
- Fact: You only pay higher tax on the portion above the threshold.
Important: This calculator provides estimates only. Your actual tax rates may differ based on personal circumstances. Always check with HMRC or a tax professional.
Important Assumptions and Limitations
- Tax year: 2025/26
- Personal Allowance: £12,570 (standard)
- No other deductions (pension, student loans, etc.) are included
- No benefits or salary sacrifice adjustments are included
- Results are estimates, not exact tax calculations
Frequently Asked Questions
For detailed tax calculations, visit our Tax Calculator UK or Income Tax Calculator UK. To find your tax bracket, try our Tax Bracket Calculator UK.