What your UK payslip actually means (take-home pay, explained)

You’re offered a £40,000 salary, but the money that lands in your account is closer to £2,560 a month — not £3,333. The gap isn’t a mistake. It’s the stack of deductions every UK payslip quietly applies before you ever see the money. Here’s what each one is.

Gross vs net — the two numbers that matter

Gross pay is your headline salary: the £40,000 in the offer letter. Net pay (your take-home) is what’s left after tax and other deductions. Almost every confusing payslip question comes down to the distance between these two numbers.

Income Tax

The UK taxes income in bands. For most of the UK in 2026/27:

• The first £12,570 is your Personal Allowance — taxed at 0%.
• Income from £12,571 to £50,270 is taxed at 20% (the basic rate).
• Income from £50,271 to £125,140 is taxed at 40% (the higher rate).
• Above £125,140 is taxed at 45%.

Crucially, the rates apply band by band — earning £1 into the higher-rate band doesn’t tax your whole salary at 40%, only the part above the threshold. (Scotland has its own bands and rates.)

National Insurance (NI)

National Insurance is a second, separate tax on earnings that funds the state pension and benefits. As an employee you pay a percentage on earnings above a threshold — a meaningful chunk that people often forget when they mentally calculate take-home from salary alone.

Pension contributions

If you’re auto-enrolled, a percentage of your pay goes into your pension before you get it. It lowers your take-home today, but it’s your money — and contributions usually get tax relief, so £1 into your pension costs you less than £1 of take-home. This is the one deduction that’s saving rather than spending.

Student loan repayments

If you studied with a student loan, repayments kick in once you earn above a plan-specific threshold, taken as a percentage of income above it. Different plans (1, 2, 4, 5, postgraduate) have different thresholds — which is why two colleagues on the same salary can have different take-home.

Putting it together

The order roughly goes: start with gross, remove pension (if salary-sacrifice), then Income Tax and NI on what’s taxable, then any student loan. What survives is your net pay — and it’s why a “£40k job” and a “£40k job with 8% pension and a student loan” feel very different on payday.

The fastest way to see your own breakdown — to the penny, for the current tax year — is to run your number through a calculator instead of doing the bands by hand.

Estimates and general information only — not financial or tax advice. Verify figures with an official source before acting on them.