UK Income Tax & NI Calculator
Calculate UK income tax, National Insurance, and take-home pay from gross salary. Includes pension relief, student loan repayments, and Scottish tax rates.
UK Income Tax & NI Calculator
Calculator
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Formula: Take-Home = Gross - Income Tax - NI - Pension - Student Loan
Worked example — Take-home: 39,520/year | 3,293/month | Effective tax rate: 15.0%
Formula
Take-Home = Gross - Income Tax - NI - Pension - Student Loan
Gross salary is reduced by income tax (calculated on taxable income above the personal allowance using progressive bands), National Insurance contributions, pension contributions, and student loan repayments to arrive at net take-home pay.
Worked Examples
Example 1: UK Tax on 50,000 Salary
Problem:Calculate income tax, National Insurance, and take-home pay for a gross salary of 50,000 pounds in England, no pension, no student loan.
Solution:Personal Allowance: 12,570 Taxable income: 50,000 - 12,570 = 37,430 Income Tax: 37,430 x 20% = 7,486 NI: (50,000 - 12,570) x 8% = 2,994.40 Total deductions: 7,486 + 2,994 = 10,480 Take-home: 50,000 - 10,480 = 39,520
Result:Take-home: 39,520/year | 3,293/month | Effective tax rate: 15.0%
Example 2: High Earner at 110,000
Problem:Calculate tax for 110,000 gross salary with 5% pension contribution, Plan 2 student loan.
Solution:Pension: 110,000 x 5% = 5,500 Reduced personal allowance: 12,570 - (110,000 - 100,000)/2 = 7,570 Taxable: 104,500 - 7,570 = 96,930 Income Tax: 37,700 x 20% + 59,230 x 40% = 7,540 + 23,692 = 31,232 NI: 37,700 x 8% + 59,730 x 2% = 3,016 + 1,195 = 4,211 Student loan: (110,000 - 27,295) x 9% = 7,443 Total deductions: 31,232 + 4,211 + 5,500 + 7,443 = 48,386 Take-home: 110,000 - 48,386 = 61,614
Result:Take-home: 61,614/year | 5,135/month | Effective tax rate: 28.4%
Frequently Asked Questions
How does UK income tax work and what are the current tax bands?
UK income tax uses a progressive system where different portions of your income are taxed at increasing rates. For the 2024-25 tax year in England, Wales, and Northern Ireland, the personal allowance is the first 12,570 pounds which is tax-free. The basic rate of 20 percent applies to income from 12,571 to 50,270 pounds. The higher rate of 40 percent applies to income from 50,271 to 125,140 pounds. The additional rate of 45 percent applies to income over 125,140 pounds. Scotland has its own income tax rates with additional bands including a starter rate of 19 percent and intermediate rate of 21 percent. The personal allowance is gradually reduced by one pound for every two pounds of income above 100,000 pounds.
What is National Insurance and how is it calculated?
National Insurance is a UK tax on earnings and self-employment profits that funds state benefits including the State Pension, Statutory Sick Pay, and the National Health Service. For employed workers (Class 1), contributions for 2024-25 are 8 percent on earnings between 12,570 and 50,270 pounds per year, and 2 percent on earnings above 50,270 pounds. Employers also pay National Insurance at 13.8 percent on employee earnings above 9,100 pounds. Self-employed individuals pay Class 2 NI (a flat weekly amount) and Class 4 NI (6 percent on profits between 12,570 and 50,270, and 2 percent above). NI contributions build your entitlement to certain benefits and your qualifying years for the State Pension.
How does the personal allowance taper work for high earners?
The personal allowance of 12,570 pounds is reduced by one pound for every two pounds of income above 100,000 pounds. This means the personal allowance reaches zero at an income of 125,140 pounds. This tapering creates an effective marginal tax rate of 60 percent on income between 100,000 and 125,140 pounds, because for every additional pound earned in this range you lose 50 pence of personal allowance plus pay 40 percent tax on the pound itself. This is one of the highest marginal rates in the UK tax system and creates a significant tax planning consideration for earners near this threshold. Strategies such as increasing pension contributions or making charitable donations under Gift Aid can reduce adjusted net income below 100,000 to preserve the full personal allowance.
What are the different student loan repayment plans in the UK?
The UK has several student loan repayment plans that determine the threshold above which you start repaying and the repayment rate. Plan 1 applies to students who started before September 2012 in England and Wales, with a threshold of 22,015 pounds and 9 percent repayment rate. Plan 2 applies to students who started from September 2012 onwards in England and Wales, with a threshold of 27,295 pounds. Plan 4 covers Scottish students with a threshold of 27,660 pounds. Plan 5, introduced for students starting from August 2023, has a threshold of 25,000 pounds. All plans use a 9 percent repayment rate on income above the threshold. Repayments are deducted automatically through PAYE alongside income tax and National Insurance.
How can I legally reduce my UK tax bill through pension contributions?
Pension contributions are one of the most effective ways to reduce your UK tax bill. Contributions to workplace or personal pensions receive tax relief at your highest marginal rate. For a basic rate taxpayer, 100 pounds of pension contribution effectively costs only 80 pounds because the pension provider claims 20 percent basic rate relief automatically. Higher rate taxpayers can claim an additional 20 percent through self-assessment, meaning 100 pounds of contribution costs only 60 pounds net. Additional rate taxpayers receive 45 percent relief. The annual allowance for pension contributions is 60,000 pounds or 100 percent of earnings, whichever is lower, with a tapered reduction for very high earners. For those earning between 100,000 and 125,140 pounds, pension contributions are especially powerful as they can restore the personal allowance and avoid the 60 percent effective marginal rate.
What does my PAYE tax code mean and why might it be wrong?
Your tax code tells the employer how much tax-free pay to give you each period, so a standard code represents the full personal allowance spread evenly across the year. Codes change when HMRC adjusts for a company car, medical cover, underpaid tax from an earlier year or a second job, and a BR or D0 code taxes everything at one rate with no allowance. An emergency code applies when a new employer has no P45 and can over-deduct until the record catches up. Because UK Income Tax & NI Calculator assumes the standard allowance, check your code on your payslip or personal tax account.
What is the difference between salary sacrifice, net pay and relief at source pensions?
Under relief at source your contribution comes from taxed pay and the provider adds basic rate relief, with any higher or additional rate claimed back through Self Assessment. A net pay arrangement takes the contribution from gross before tax, giving full relief immediately but no National Insurance saving. Salary sacrifice goes further: you give up gross salary, so both income tax and employee National Insurance fall, and the employer saves its contribution too. UK Income Tax & NI Calculator deducts the pension percentage before income tax but still charges NI on the full salary, matching a net pay arrangement.
Why do Scottish taxpayers face different rates but the same National Insurance?
Income tax rates and bands on earnings are devolved to the Scottish Parliament, which is why the Scottish setting adds starter, intermediate and advanced bands and a higher top rate. National Insurance is reserved to Westminster, so it is identical across the UK, as is the personal allowance and the tax on savings interest and dividends. Status depends on where your main home is during the tax year rather than where your employer sits, and HMRC signals it with an S prefix on the tax code.
When does PAYE stop being enough and a Self Assessment return become necessary?
PAYE settles tax on a single salary well, but a return is generally needed for untaxed income such as self-employment, rental profits, significant dividends or capital gains, and for higher and additional rate taxpayers reclaiming relief on relief-at-source pension contributions or Gift Aid. The High Income Child Benefit Charge also pulls families into Self Assessment once one partner's adjusted net income passes the published threshold. Registration and filing deadlines and all the thresholds are set by HMRC and should be checked on gov.uk each year.
Why does a bonus month look far more heavily taxed than this annual estimate?
PAYE normally operates on a cumulative basis, projecting the year from pay received so far. A large one-off bonus temporarily pushes the projection into a higher band, so that month's deduction can look punitive, and the personal allowance taper above 100,000 pounds can bite briefly for the same reason. Later months usually self-correct as the cumulative calculation rebalances, and any remaining difference is settled after the tax year ends, either by an HMRC calculation or through a return. An annual figure like the one here is the fairer comparison.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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