Understanding a UK Payslip Line by Line

Gross vs net: why the number is smaller than you expected

Every UK payslip starts with the same small shock: the salary you agreed is not the money that arrives in your bank account. The figure in your contract is your gross pay — what you earn before anything is taken off. What actually lands in your account is your net pay, sometimes called take-home pay. The gap between the two is made up of deductions: income tax, National Insurance, usually a pension contribution, and sometimes a student loan repayment.

By law, your employer must give you a payslip on or before payday, showing gross pay, each deduction, and net pay. Most arrive by email or through an online portal. Get into the habit of actually opening it — payroll mistakes are common in the first month or two of any job, and you are the only person who will notice.

PAYE: how tax is taken before you see it

The UK collects income tax from employees through PAYE — Pay As You Earn. Your employer calculates the tax due on each payday and sends it to HMRC (the UK tax authority) on your behalf. You never have to file anything yourself for a normal salaried job; there is no annual tax return for most employees, which surprises people from countries where everyone files.

PAYE works on a cumulative basis across the tax year, which runs from 6 April to 5 April — not the calendar year. Each month you receive one-twelfth of your tax-free allowance, and the system constantly re-balances. This is why your first payslip after starting a job mid-year, or after a pay rise, can look odd: the system is catching up. Most people pay no tax on roughly the first £12,570 they earn in a year (the personal allowance, as of mid-2026), then 20% on the next band, with higher rates above that. Scotland sets its own income tax bands and rates, so the same salary can be taxed slightly differently in Edinburgh than in Manchester. Current bands are on GOV.UK.

The tax code: what 1257L actually means

Somewhere on your payslip is a short code such as 1257L. This is your tax code, and it tells your employer how much tax-free income to give you. Multiply the number by ten: 1257 means £12,570 of tax-free allowance for the year. The letter L simply means you get the standard allowance. An S prefix (S1257L) means Scottish rates; a C prefix means Welsh rates.

Codes worth a second look:

• 1257L W1, M1 or X — an emergency code (see below). Fine briefly, bad long-term.
• BR — everything taxed at 20% with no allowance. Correct for a second job, usually wrong for your only job.
• 0T — no allowance at all, often because your employer has no starter information for you.
• K codes — you owe tax from elsewhere; worth checking you understand why.

You can see what HMRC thinks your code should be, and correct it, in your Personal Tax Account on GOV.UK. If your code is wrong, do not wait for it to fix itself — sometimes it does, sometimes it quietly does not.

National Insurance: the second deduction

The next line is National Insurance (NI), a separate payroll tax that funds the state pension and some benefits. Employees pay Class 1 NI as a percentage of earnings above a weekly threshold; unlike income tax it is calculated per pay period, not cumulatively over the year. The rates have changed several times in recent years, so check the current figures on GOV.UK rather than trusting a number in an old blog post.

To be paid correctly you need a National Insurance number — a personal reference in the format QQ 12 34 56 C. It appears on every payslip. You can start work before it arrives, but apply for it promptly, and never share it casually: it is a key piece of identity information.

Pension auto-enrolment: the deduction you chose without choosing

If you are aged 22 or over and earn more than £10,000 a year, your employer must automatically enrol you into a workplace pension — this is pension auto-enrolment. A slice of your pay (commonly around 5%, including tax relief) goes into a pension pot, and your employer must add at least 3% on top. That employer contribution is effectively free money, which is why most advice leans towards staying in, but you are allowed to opt out — the pension provider, not your employer, handles that, and pressure from an employer to opt out is unlawful. Details are on GOV.UK; for neutral guidance try MoneyHelper.

Student loan deductions

If you studied in the UK with a government student loan, repayments appear on your payslip as another line — see student loan repayment. You repay a percentage of earnings above a threshold that depends on your plan type (Plan 1, 2, 4, 5 or Postgraduate Loan); the thresholds differ and change most years. International students who funded their own degrees have no UK student loan — so if a deduction appears and you never had one, your employer has recorded your starter information wrongly. This usually happens when the starter checklist was filled in incorrectly on day one. Tell payroll immediately; refunds are possible but slow.

P45, P60 and the paperwork that follows you around

Two documents matter enough to keep forever. When you leave a job, your employer must give you a P45, showing your pay and tax so far that tax year — hand it to your next employer so they can tax you correctly from your first payday. If you have no P45 (first UK job, or you lost it), you complete a starter checklist instead, and your answers set your initial tax code, so read it carefully.

After the tax year ends, anyone employed on 5 April receives a P60 by 31 May: a one-page summary of the whole year's pay and tax. You will need it for visa applications, mortgage applications, tax refund claims and proving income. Save the PDF somewhere permanent.

Emergency tax: how to spot it and what to do

If HMRC does not yet know enough about you — typically in your first UK job, or when you start a new job without a P45 — you may be put on emergency tax. The signs: a code ending W1, M1 or X, or a code of 0T or BR on your only job, and a net pay noticeably lower than online take-home calculators predict.

Emergency tax is not a fine and not permanent. Fix it by giving your employer your P45 or completed starter checklist, then checking your code in your Personal Tax Account. Once the correct code comes through, PAYE's cumulative design means you are usually refunded automatically in your next payslip. If you overpaid and then stopped working — common for students leaving after a summer job — you can claim the refund directly from GOV.UK. Never pay a "tax refund agent" a cut to do this; the official process is free.

One final habit worth keeping: check your payslip every month against three questions. Is the gross right? Is the tax code right? Did anything new appear? Five minutes a month catches almost every payroll problem while it is still easy to fix.