Written and reviewed by James Whitfield · Updated for 2026/27 · Editorial standards · Methodology
A practical breakdown of UK payslip lines and how to reconcile payslip values with take-home estimates.
Payslip literacy is one of the fastest ways to reduce salary-planning mistakes. This guide helps you map each deduction line to a clear assumption.
A typical UK payslip has six core lines. Gross pay is your salary before any deductions — this is the number your contract shows. Taxable pay may be lower than gross pay if you have salary sacrifice arrangements (pension, cycle to work, childcare vouchers) that reduce the taxable base.
Income tax is the PAYE deduction calculated from your cumulative taxable pay for the year. National Insurance (NI) is calculated separately using its own thresholds and rate schedule — 8% between the primary threshold and upper earnings limit, 2% above. Pension shows your contribution, which may come out before or after tax depending on your scheme type. Student loan repayment appears separately and uses a plan-specific threshold and 9% rate (6% for Postgraduate Loans).
Net pay is what arrives in your bank account: gross pay minus income tax, NI, pension, student loan, and any other deductions. If your payslip shows tax period number, this tells you which week or month of the tax year the pay relates to — useful if you receive a late payslip or need to reconcile a P60.
Your payslip income tax deduction is cumulative — it adjusts each month to keep you on track to pay the correct annual tax. In April (month 1), you receive one-twelfth of your personal allowance. By March (month 12), all allowance has been used. If your salary is steady and your tax code is correct (1257L for most employees), monthly tax should be consistent.
To sense-check your monthly tax, divide your annual salary by 12, subtract £1,047.50 (one-twelfth of the £12,570 personal allowance), and multiply by 0.20 for basic rate. For a £35,000 salary: (£35,000 ÷ 12) – £1,047.50 = £1,869.17; × 0.20 = £373.83/month income tax. If your payslip shows significantly more or less than this and you have no unusual deductions or benefits, your tax code may be wrong.
Unusual months (bonuses, backdated pay, irregular pay periods) will show higher deductions. This is normal — PAYE annualises the month's pay and calculates tax accordingly, then corrects in later months. If you leave employment after a high-bonus month, you may be owed a tax refund because the correction never happens.
Online calculators give annual estimates divided by 12. Payroll processes each month individually using cumulative tax position, period-specific NI calculations, and any mid-year changes. Small variance is expected and normal — typically within £5–£20/month for a straightforward salary.
Large variances (more than £50/month with no change in salary) usually come from four sources: incorrect tax code being applied, wrong student loan plan setting, pension contribution type mismatch (sacrifice vs standard), or a one-off adjustment like benefit-in-kind or NI correction.
The most reliable reconciliation method: check your tax code on your payslip against your HMRC Personal Tax Account. If they match and both equal 1257L (or your correct code for your circumstances), the income tax figure should align. If pension is salary sacrifice, ensure your calculator is also modelling sacrifice — not a standard (relief at source) contribution.
Your employer must give you a P60 by 31 May each year, covering the full April-to-April tax year. It shows total gross pay, total tax deducted, total NI deducted, and total student loan paid. This is the definitive record for the year and the document you need if you are completing a self-assessment return or claiming a tax refund.
Check the P60 against your payslip history: the P60 gross figure should equal the sum of all gross pay entries. The tax figure should match cumulative tax. If there is a discrepancy, contact your payroll team — errors on P60s are uncommon but not impossible.
If you had more than one employer during the year, each will issue a P60 (or P45 if you left during the year). HMRC reconciles your total income from all sources, which is why you may receive a tax calculation notice (P800) after the year end if your combined income resulted in under or overpayment.
Start with gross pay and taxable pay, then verify income tax and NI lines. Next confirm loan and pension entries before checking final net pay.
This sequence reduces confusion because each step explains the next. Teams and individuals using this workflow usually resolve mismatches quickly.
Gross pay: your contractual salary for the period before any deductions. If monthly paid, this is annual salary divided by 12. Overtime, bonuses and commission may appear as separate additions. Taxable gross may differ if salary sacrifice applies — the sacrifice amount is deducted before PAYE is applied.
Income tax: shown as a monthly deduction based on your cumulative PAYE position. In the middle of the year, this should equal roughly your expected annual tax divided by the number of months worked. A 'tax code' line (e.g. 1257L) will also appear — this tells your employer how much of your personal allowance to apply. If the code shows W1 or M1 (non-cumulative), each month is taxed independently, which can cause both under- and over-payment.
National Insurance: calculated on NIable pay (gross minus any salary sacrifice, but before income tax personal allowance). Employee Class 1 NI is 8% on earnings from £12,570 to £50,270 and 2% above. If you see 'Employee NI' and 'Employer NI' on the same payslip, note that the employer NI is a cost to your employer only — it does not reduce your take-home pay. Student loan repayment: appears as a separate line if your plan and earnings are above the threshold. The deduction is 9% of earnings above the plan threshold (or 6% for postgraduate). Pension: if salary sacrifice, your gross shows the reduced amount. If net-pay or relief-at-source, the pension appears as a deduction from net pay or an addition to the pension line. Net pay: everything subtracted from gross, resulting in the bank transfer amount.
Wrong tax code: if your tax code is incorrect (e.g. emergency code 1257L W1/M1 instead of cumulative 1257L), you may be over- or under-paying tax each month. Check the code on your payslip matches what HMRC shows on your online account or recent P60. If they differ, contact HMRC to correct the code — your employer will update it once they receive a revised tax code notice.
Missing student loan deduction: if you have an active loan plan and earnings above the threshold but no deduction appears, check with payroll. It is likely the employer does not have your Student Loan Start Notice (SL1) on file. HMRC will issue the SL1 automatically, but it can take until the second or third month of employment to arrive. Repayments will be backdated to the start of the tax year via the April payslip or carried forward.
Salary sacrifice not applied: if you agreed salary sacrifice but the gross pay on your payslip is still the full contractual salary (not reduced by the sacrifice amount), the scheme may not have been configured correctly. Your pension contributions may still be going in but as net-pay contributions rather than sacrifice — meaning you are losing the NI saving. Raise this with HR promptly, as the NI saving cannot be backdated once the period is closed.
Current tax-year thresholds used across this guide and calculator.
Common reasons are payroll timing, one-off overtime or bonus entries, tax code updates, and deduction settings that differ from your assumptions. Compare each payslip line separately rather than only comparing net pay.
Start with tax code, taxable pay to date, student loan plan, and pension contribution type. Most reconciliation issues come from one of these fields.
Yes. Understanding your current payslip baseline helps you evaluate how much of a proposed gross increase is likely to appear in monthly take-home pay.
Yes. Use the scenario links in this guide to open prefilled states, then adjust salary, region, loan and pension settings.
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Tax region, tax code, student loan plan, pension contribution and salary sacrifice are the key assumptions to check first.