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Why are my payslip deductions so high? A line-by-line breakdown

A reader asked: 'I earn £35,000 but only get £2,300 a month — where does the rest go?' Great question. Here is every deduction on a typical UK payslip, in plain English, with the actual maths.

29 May 2026·7 min read

"I earn £35,000 a year but I'm only getting about £2,300 a month. Where on earth does the rest go?"

This question comes up constantly on Reddit's r/UKPersonalFinance, on Quora, and from people using our payslip checker for the first time. It's not a sign that something is wrong. It's just that most people have never had the UK PAYE system explained to them clearly.

Let's fix that. Here is exactly where the money goes on a £35,000 salary — every line, with the actual calculation.

Starting point: gross pay

£35,000 ÷ 12 months = £2,916.67 gross per month. This is your pre-deduction pay — the number your employment contract quotes. Everything below is subtracted from this.

Deduction 1: Income Tax

Income tax is calculated on your taxable income — your gross pay minus your personal allowance.

  • Annual personal allowance (tax-free): £12,570
  • Taxable income: £35,000 − £12,570 = £22,430
  • Tax at 20% basic rate: £22,430 × 20% = £4,486/year → £373.83/month

This assumes a standard 1257L tax code. If your code is different — lower due to a benefit-in-kind, emergency tax, or HMRC error — your monthly tax will be higher. Check our tax code checker if you're unsure.

Deduction 2: National Insurance (NI)

NI follows different rules to income tax. It has its own threshold and rates, and crucially, it is calculated monthly — not cumulatively like income tax.

  • Monthly NI-free amount (Primary Threshold): £1,048/month
  • NI-liable earnings: £2,916.67 − £1,048 = £1,868.67/month
  • Employee NI at 8%: £1,868.67 × 8% = £149.49/month

At £35,000, all your earnings are below the Upper Earnings Limit (£4,189/month), so the full 8% rate applies throughout. The 2% rate only kicks in above that level.

Deduction 3: Workplace Pension

If you're auto-enrolled (most employees aged 22+ earning above £10,000 are), you contribute at least 5% of your "qualifying earnings." Qualifying earnings in 2026/27 are calculated on the band between £6,240 and £50,270.

  • Qualifying annual earnings: £35,000 − £6,240 = £28,760
  • 5% employee contribution: £28,760 × 5% = £1,438/year → £119.83/month

Your employer adds at least 3% on top of this (£86.28/month). This is free money — you'd lose it by opting out.

The total: where your £616/month has gone

DeductionMonthly amount
Income Tax£373.83
National Insurance£149.49
Pension (employee 5%)£119.83
Total deductions£643.15
Monthly take-home£2,273.52

So you're taking home £2,274 out of £2,917 gross — that's 78% of your gross pay. The remaining 22% breaks down as 12.8% income tax, 5.1% NI, and 4.1% pension.

What else might appear on your payslip?

Student loan

If you have a student loan, this is collected through PAYE automatically. At £35,000, a Plan 2 borrower repays 9% of earnings above £29,385: (£35,000 − £29,385) × 9% ÷ 12 = £42.11/month. This would reduce take-home to approximately £2,231.

Salary sacrifice

If your pension is via salary sacrifice rather than a standard deduction, it reduces your gross pay before tax is calculated — meaning you pay slightly less income tax and NI. The pension deduction will still show on your payslip but in a different position in the calculation.

Benefits-in-kind

A company car, private medical insurance, or employer-provided gym membership is treated as additional taxable income. HMRC reduces your tax code to collect the tax in advance through your monthly deductions.

Why does my payslip look different from these calculations?

A few common reasons:

  • Wrong tax code: The single biggest cause of unexpected deductions. Check our tax code checker.
  • Bonus or overtime in one month: NI is calculated monthly, not annually. A high-earning month means a large NI deduction — there's no "averaging" effect like income tax.
  • Previous year underpayment: HMRC sometimes collects underpaid tax from previous years through your current code, reducing your allowance.
  • Variable pensionable pay: If your pension is calculated on total earnings including overtime, a busy month increases pension deductions too.

Frequently asked questions

Why did my tax increase when I got a pay rise?

A pay rise can push some of your earnings into a higher income tax or NI band. Additionally, if it's now being projected that your annual income has risen, HMRC may adjust your tax code. Use our take-home calculator to see exactly what your new deductions should be.

My colleague earns the same as me but takes home more. Why?

Different tax codes, different pension arrangements, different student loan plans, or different benefit-in-kind values all create differences at the same gross salary. The most common reason is a different tax code.

Can I reduce my deductions legally?

Yes — contributing more via salary sacrifice pension reduces both income tax and NI on those contributions. An ISA protects savings interest from creating a HMRC coding adjustment. Claiming all allowances you're entitled to (Marriage Allowance, professional subscriptions, uniform washing, work-from-home allowance) reduces your taxable income further.

Does my employer pay tax on my behalf?

Your employer collects income tax and employee NI from your pay and passes it to HMRC. They also pay employer NI separately on your salary (13.8% above the Secondary Threshold) — this doesn't come from your pay, but it does affect the total cost your employer bears for having you on their payroll.

Run your own numbers using our payslip calculator — enter your gross salary and get a full breakdown in seconds.

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