Take-home pay, explained
Why two people on the same salary can take home different amounts.
Two people on the same salary can take home noticeably different amounts, once you factor in pension contributions, student loans and which tax code HMRC has assigned. Here's what actually happens between your gross salary and the number that lands in your account.
The order deductions happen in
Deductions don't apply to your full salary independently — they apply in sequence, and the order matters:
- Pension first (if it's salary sacrifice). Most workplace pensions now use salary sacrifice, meaning your contribution is taken off your salary before tax and National Insurance are calculated. A 5% pension contribution on a £34,000 salary doesn't just reduce your take-home by 5% of £34,000 — it also reduces the income that tax and NI are calculated on, so part of that 5% is effectively funded by tax and NI you'd otherwise have paid.
- Income tax on what's left, using your personal allowance and the relevant bands.
- National Insurance, calculated separately from income tax with its own thresholds.
- Student loan repayments, if you have a plan — 9% of income above your plan's threshold (6% for a Postgraduate loan).
Why your tax code matters more than people think
Most employees are on 1257L, which gives the standard £12,570 tax-free personal allowance. But emergency or second-job codes like BR, D0 and D1 apply a flat rate — 20%, 40% or 45% — to all of your pay from that job, with no tax-free allowance at all. If you've started a new job and haven't handed in a P45, there's a good chance you're on one of these until HMRC catches up, which is often why a first payslip looks lower than expected.
The Scottish difference
Scottish taxpayers pay income tax under a different set of bands — more of them, with different rates — while still paying UK-wide National Insurance. Two people with identical salaries, one in Scotland and one in England, can end up with different take-home pay purely because of the different income tax bands.
Why the pension percentage is worth double-checking
A pension contribution can be quoted as a percentage of gross salary, "qualifying earnings" (a lower band used for auto-enrolment minimums), or a fixed amount — check which one applies to you before relying on a rough take-home figure, since the difference can be a few hundred pounds a year.
Worked example: on a £34,000 salary with a 5% salary-sacrifice pension and a standard 1257L tax code, roughly £1,700 goes to pension, then income tax and National Insurance are calculated on the remaining £32,300 — not the original £34,000.