The salary on your offer letter is not what lands in your bank. UK employees lose 25 to 35 percent of gross pay to tax, NI, student loan and pension. Find out exactly what you actually take home.
Your UK gross salary loses ground to four main deductions before reaching your bank account. Understanding each one helps you spot errors, plan tax efficiently, and negotiate better at work.
Income tax is the largest typical deduction. The first £12,570 of income each year is tax free thanks to the personal allowance. The next slice up to £50,270 is taxed at 20 percent (basic rate). Income above £50,270 is taxed at 40 percent (higher rate), and above £125,140 at 45 percent (additional rate). National Insurance is the second deduction, taking 8 percent between £12,570 and £50,270, and 2 percent above that. Student loan repayments depend on which plan you graduated under, ranging from 9 percent above £24,990 (Plan 1) to 9 percent above £28,470 (Plan 2). Pension contributions are usually 5 to 10 percent of salary, taken before tax, so they reduce your taxable income.
Between £100,000 and £125,140 of income, the UK tax system creates one of the most punitive marginal rates in the developed world. The reason is the personal allowance taper: above £100,000, your £12,570 tax free allowance is withdrawn at a rate of £1 for every £2 earned, until it disappears entirely at £125,140.
The maths is brutal. Every extra pound of income between £100,000 and £125,140 is taxed at 40 percent income tax, plus 2 percent NI, plus an effective 20 percent through the lost personal allowance, totalling 62 percent or sometimes 67 percent depending on student loan and pension status. A £10,000 raise from £100k to £110k can result in just £4,000 of net additional take home pay.
The standard escape route is pension contributions. Paying enough into pension to keep taxable income below £100,000 saves thousands per year. Each £1,000 paid in costs as little as £400 net, while preserving the personal allowance worth up to £1,260 per year in saved tax.
Your tax code is a critical number that tells your employer how much tax to deduct each month. The standard code in 2025/26 is 1257L, which gives you the full personal allowance of £12,570. The L means you are entitled to the standard tax free personal allowance.
Other common UK tax codes include BR (basic rate, all income taxed at 20 percent, often used for second jobs), 0T (no personal allowance, used when HMRC has insufficient information), K codes (where deductions exceed allowances, used for taxable benefits or unpaid tax from previous years), and D0 or D1 (all income taxed at higher or additional rate respectively).
Wrong tax codes are surprisingly common, especially after starting a new job, having multiple jobs, or returning to work after a break. You can check yours through the HMRC mobile app or your Personal Tax Account at gov.uk. If your code is wrong, you may be paying too much (refundable) or too little (which you will owe later). Tax codes update automatically each April, but always verify after major life changes like a pay rise, a new job, or starting a pension.
National Insurance is often misunderstood because the rates are different from income tax. In 2025/26, employees pay 8 percent NI on earnings between £12,570 and £50,270, then 2 percent on everything above £50,270. There is no NI on income below £12,570, similar to income tax.
The interesting thing is what NI is supposed to fund. Officially, NI contributions go toward the State Pension, NHS, and certain benefits. In practice, they go into the same general government pot as income tax, and qualify you for a State Pension based on your number of qualifying years (currently 35 years for the full new State Pension of around £230 per week).
A common misconception: paying more NI does not mean a bigger State Pension. The pension amount is based on years of contribution, not total contributions. So paying NI on a £100,000 salary gets you the same State Pension as paying NI on a £30,000 salary, assuming both have 35 qualifying years.
Pension contributions are the most powerful tax break available to most UK employees. Money you put into pension is deducted before tax is calculated, meaning you avoid paying income tax on that portion of your salary. For a basic rate taxpayer, every £1 contributed costs 80p net. For a higher rate taxpayer, every £1 costs 60p net. For someone in the £100k tax trap, the cost can drop to as little as 40p net per £1 contributed.
UK workplace pensions typically offer two types of contribution. Salary sacrifice (the more efficient option) reduces your gross salary in exchange for higher employer pension contributions, saving both income tax and NI. Relief at source (the standard option) takes contributions from net pay and HMRC tops up the basic rate. For higher rate taxpayers, you must claim the additional relief through Self Assessment if your scheme uses relief at source.
The annual pension allowance is £60,000 for 2025/26 (or 100 percent of earnings if lower). Above this, contributions still count but no longer get tax relief. High earners with adjusted income above £260,000 face a tapered annual allowance, dropping as low as £10,000.
UK student loans behave more like a graduate tax than a traditional debt. You only repay 9 percent of any earnings above your plan's threshold, regardless of how much you owe. Plan 1 (pre-2012 graduates) has a £24,990 threshold and writes off after 25 years. Plan 2 (2012-2023 graduates) has a £28,470 threshold and writes off after 30 years. Plan 5 (2023+ graduates) has a £25,000 threshold and writes off after 40 years, much longer than older plans. Postgraduate loans have a separate £21,000 threshold with 6 percent repayment rate.
Most graduates never fully repay their loan, especially under Plan 2. Studies suggest only the top 20 to 30 percent of earners clear their loan before write off. This means for most people, paying extra voluntarily makes no financial sense, the loan would have been written off anyway. The exceptions are very high earners who will clearly clear the loan, and people close to the end of their repayment period.
If your payslip shows different numbers from this calculator, the usual causes are: wrong tax code (check via the HMRC app), different pension scheme (salary sacrifice vs relief at source produces different tax outcomes), multiple income sources (HMRC may apply BR or 0T codes to second jobs), unpaid tax from previous years being collected through your tax code, or taxable benefits like company car or private medical insurance affecting your code.
To investigate, log into your Personal Tax Account at gov.uk and check your tax code, your pay and tax history, and any benefits in kind. If something looks wrong, contact HMRC directly through the app or by phone. Refunds for overpaid tax are processed automatically when HMRC corrects your code, though sometimes you may need to claim manually for previous years.
UK take home pay is your gross salary minus income tax, National Insurance, student loan repayments and pension contributions. In 2025/26, the personal allowance is £12,570 (tax free), basic rate of 20 percent applies up to £50,270, higher rate of 40 percent up to £125,140, and additional rate of 45 percent above. National Insurance is 8 percent on earnings between £12,570 and £50,270, then 2 percent above. Most UK employees take home 65 to 75 percent of their gross salary depending on tax band, student loan, and pension.
On a £30,000 UK salary in 2025/26 with no student loan and 5 percent pension contribution, take home pay is approximately £24,300 per year, or £2,025 per month. Income tax takes around £3,486, NI takes £1,394, and pension takes £1,500. With a Plan 2 student loan, take home drops by another £138 per year. The exact figure depends on your tax code, pension type (salary sacrifice or relief at source), and any other deductions.
On a £50,000 salary in 2025/26 with no student loan and 5 percent pension, take home is approximately £37,400 per year, or £3,117 per month. You stay just below the higher rate threshold (£50,270), so all income tax is at 20 percent. With £1,000 of bonus or overtime, you would cross into the higher rate band, paying 40 percent on the portion above £50,270. This is why many UK earners deliberately keep gross salary just below £50,270 by increasing pension contributions.
On £100,000 in 2025/26 with no student loan and 5 percent pension, take home is approximately £67,500 per year, or £5,625 per month. You are right at the start of the £100,000 tax trap, where the personal allowance begins to taper. Increasing pension contributions to bring taxable income below £100,000 typically saves thousands in tax per year. Many high earners deliberately route bonuses or salary increases into pension to dodge this band.
Your tax code tells your employer how much tax free personal allowance to apply. Code 1257L gives you £12,570 (the standard amount). Code BR taxes all income at 20 percent (used for second jobs). Code 0T applies no personal allowance. Code K means deductions exceed allowances, often used for taxable benefits or unpaid tax. Wrong tax codes are common after starting a new job or having multiple incomes, so always verify yours through the HMRC mobile app, especially after pay rises or job changes.
For higher rate taxpayers, increasing pension contributions is one of the best financial moves available. Every £1 paid into pension only costs 60p net for higher rate, and as little as 40p for those in the £100k tax trap. Combined with employer matching (where available), pension contributions can produce returns of 50 to 200 percent before any investment growth. Most UK employees should aim to contribute at least up to their employer match, then beyond that depending on tax band and retirement goals.