How to Read Your Payslip: Every Deduction Explained
Your payslip arrives every month, but the numbers can feel like a mystery. Your gross salary and your take-home pay are two very different figures, and learning to read your payslip and understand every deduction is essential for managing your money. Between income tax, National Insurance contributions, pension savings, and student loan repayments, the gap between what you earn and what you actually receive can be substantial. This guide explains what every line on your payslip means, why you're being deducted amounts you didn't expect, and how to check that your employer is getting it right.
Breaking Down Your Payslip
Every payslip has the same basic structure, though the exact format varies by employer and sector. At the top, you'll see your gross pay — the total amount you've earned before any deductions. Below that come the deductions: income tax, National Insurance, pension contributions, student loan repayments, and any benefits in kind (company car, private health insurance, etc.). The final figure is your net pay — what actually goes into your bank account.
Your payslip also shows year-to-date figures, which let you track how much tax and National Insurance you've paid so far this tax year (which runs from 6 April to 5 April, not the calendar year). At the bottom, you'll see your tax code and NI category — the codes your employer uses to calculate your deductions correctly. If you're comparing your situation to others, it's worth noting that public sector pay often differs from private sector salaries even at the same grade, and some sectors like healthcare have unique pension schemes — we cover NHS pensions separately if that applies to you.
Gross Pay vs Net Pay: Where Your Money Goes
Here's where most people find the gap surprising. On a £35,000 gross salary, here's what a typical UK payslip looks like:
- Income tax: £4,486/year (20% on earnings above the personal allowance of £12,570)
- National Insurance: £2,690/year (8% on earnings between £12,570 and £50,270)
- Take-home pay: £27,824/year, or roughly £2,319/month
That's a loss of 21% of your gross salary, and that's before pension contributions or student loans. The maths looks harsh until you remember that income tax starts at £0 — your first £12,570 is completely tax-free under the personal allowance. The 20% you pay on the rest is the standard rate for most UK taxpayers. National Insurance follows a similar principle: it only applies to earnings above £12,570 and stops climbing at £50,270.
To see exactly what a specific salary looks like after tax, head to our detailed breakdown for a £40,000 salary, which walks through a real example step-by-step. You can also use our salary calculator to plug in your own gross figure and see your actual take-home instantly.
Key Deductions Explained
Income Tax
Income tax is calculated using your tax code, which your employer receives from HMRC. The most common is 1257L (for the 2025/26 tax year), which means you have a personal allowance of £12,570. Some people have emergency codes (prefixed with X or K) if their records are unclear, which can mean you're over-paying or under-paying throughout the year — your P60 at year-end sorts it out.
You can check your tax code on your payslip, and if it looks wrong, you can query it with HMRC's tax code checker. You'll also receive a P60 every April, which summarises your annual tax and National Insurance paid — here's how to read that P60 document.
National Insurance
National Insurance is often called "a second tax" because it reduces your take-home pay but funds different state benefits than income tax. For employees in 2025/26, it's 8% on earnings between £12,570 and £50,270, then 2% above that. The threshold changes most years.
One common misconception: overtime and bonuses aren't taxed at a special rate. They're subject to your marginal rate — the rate you pay on your highest earnings. If you're a basic rate taxpayer earning £35,000, overtime is taxed at 20%. If a bonus pushes you above £50,270 into the higher rate band, only the portion above that threshold is taxed at 40%.
Pension Contributions
Pension contributions are deducted before income tax is calculated, which gives you an immediate "tax relief" boost. If you contribute 5% of a £35,000 salary (£1,750), your taxable income drops to £33,250. A basic rate taxpayer saves £350 in tax — meaning the contribution costs you £1,400 from your net pay, not £1,750. It's effectively a 20% discount from the government.
If you're earning above £100,000, pension contributions become even more valuable — they can bring you back below the threshold where you lose your personal allowance. This creates an effective marginal tax rate of up to 60% in that band, making pension contributions a form of tax planning as well as retirement saving. If you work in the NHS, your pension scheme is different and often more generous than private sector schemes.
Student Loan Repayments
If you're on Plan 2 (borrowed after April 2012), you pay 9% of earnings above £27,295. On a £35,000 salary, that's £693/year. The government has published detailed guidance on student loan repayment, and crucially, any unpaid balance is written off after 30 years, so it's not a debt in the traditional sense. Student loans are taken from your payslip and appear alongside tax and National Insurance, but they're not taxes — if you stop earning above the threshold, repayments pause too.
Salary Sacrifice & Benefits in Kind
Some employers offer salary sacrifice schemes: you sacrifice part of your gross pay in exchange for a benefit (childcare vouchers, cycle to work, electric vehicle charging). Since the reduction happens before tax is calculated, you save both income tax and National Insurance.
Sacrifice £5,000 for childcare vouchers, and a basic rate taxpayer saves £1,600 (£1,000 in tax + £400 in National Insurance). For the employee, it's like getting a 32% discount. The catch: salary sacrifice reduces your recorded gross pay, which might affect maternity pay eligibility or mortgage affordability calculations (though not always — it depends on the lender). If you're planning maternity leave, check with your payroll team about how salary sacrifice affects your maternity pay calculation.
Benefits in kind (a company car, private health insurance, gym membership) are taxed differently — they get added to your taxable income, which increases your income tax bill but not your National Insurance. This is why choosing between a company car and a car allowance has real tax implications.
How to Spot Errors on Your Payslip
Your payslip is a record that you and your employer rely on, so it pays to check it carefully. Here's what to verify:
- Tax code: Is it a standard code (1257L) or an emergency code (X, K, etc.)? If you're unsure, HMRC will tell you.
- Gross pay: Does it match your salary and any bonuses or overtime you've earned?
- Deductions: Add up tax + National Insurance + pension + student loan. They should roughly equal gross pay minus your net pay (plus any other deductions like salary sacrifice).
- Year-to-date figures: These should increase each month and match your understanding of what you've earned and paid so far.
If you spot an error — a wrong tax code, a missing overtime payment, or a double deduction — flag it with your payroll team immediately. It's easier to correct a recent payslip than to chase it after year-end. One useful cross-check: your annual P60 statement arrives every April and summarises the full tax year. Your cumulative payslips should match the P60.
Frequently Asked Questions
Q: Why is my take-home pay so much lower than my gross salary?
A: Income tax, National Insurance, and (if applicable) pension contributions and student loans all reduce your take-home. On a basic salary, you'll typically lose 21–25% of gross pay to tax and National Insurance alone. If you also contribute to a pension, student loans, or salary sacrifice schemes, the gap widens further.
Q: What's the difference between gross and net pay?
A: Gross pay is your total earnings before any deductions. Net pay (also called take-home or pay in hand) is what's left after tax, National Insurance, and other deductions are removed. Your payslip shows both, and understanding the gap helps you budget and plan.
Q: Can I reduce my tax bill?
A: Yes, several ways. Maximising pension contributions, using an ISA to shelter savings from tax, salary sacrifice schemes, and claiming all eligible allowances and reliefs. For some, negotiating a higher salary net of tax (not gross) is the fastest option — use a salary calculator to compare job offers on take-home pay, not the advertised gross figure.
Q: Why do I pay National Insurance if I already pay income tax?
A: National Insurance is collected separately, though it serves similar purposes (funding benefits, the state pension, NHS). From your perspective, it's an additional deduction on top of income tax. You can't avoid it unless you're over state pension age or fall into certain exempt categories.
Q: What should I do if my tax code is wrong?
A: Check your payslip for your tax code and compare it to HMRC's official letter. If it doesn't match, contact HMRC or ask your payroll team to query it. An emergency code (X, K, etc.) means your records aren't fully clear — you'll likely get a refund or adjustment in April via your P60.
Q: Does overtime get taxed differently?
A: No, overtime is taxed at your marginal rate — the same rate as your regular pay. If you're a basic rate taxpayer, overtime is 20%. If a bonus or overtime pushes you above the higher rate threshold (£50,270), only the portion above that is taxed at 40%.
Q: How do I know if I've paid too much tax?
A: Compare your annual P60 (sent in April) to what you expect to owe. If the figures don't match, you may have overpaid. HMRC will usually recalculate and issue a refund or adjustment. You can also request a tax calculation from HMRC if you're unsure.
Q: How does salary sacrifice affect my take-home pay?
A: Salary sacrifice reduces your gross pay, which sounds bad — but it also reduces the amount of tax and National Insurance you owe. On balance, most employees come out ahead. A £5,000 salary sacrifice might only cost £3,400 from your net pay, thanks to the tax and National Insurance savings.
What to Do Next
Your payslip is the clearest record you have of your earnings and deductions. Understanding it puts you in control of your finances. If you're about to negotiate a new salary, remember to compare offers on take-home pay, not gross — our salary calculator does the maths for you. And if you're planning major life changes — maternity leave, a career break, or a raise — knowing exactly how tax and National Insurance affect your numbers helps you plan with confidence.