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How to Read Your Payslip: Understanding Every UK Deduction

SYM

A 2025 survey found that 60% of UK employees couldn't explain more than half the deductions on their payslip. This isn't just a knowledge gap — it's a financial risk. Incorrect tax codes, missed pension contributions, and payroll errors cost UK workers millions every year. Understanding your payslip takes 10 minutes of learning and could save you hundreds of pounds by catching errors early. Here's a line-by-line guide to everything on your UK payslip.

Gross Pay and Basic Deductions

Your gross pay is the total amount you've earned before any deductions. This includes your basic salary, overtime, bonuses, and any taxable benefits. For salaried employees paid monthly, divide your annual salary by 12 to check this figure. PAYE (Pay As You Earn) income tax is then deducted based on your tax code — for most people, the code 1257L means you have a £12,570 Personal Allowance. If your tax code looks different (especially starting with BR, D0, or containing W1/M1), it's worth investigating as you may be overpaying.
  • •Gross pay = total earnings before deductions
  • •Check your tax code — 1257L is the standard code
  • •BR code = all income taxed at basic rate (common error)
  • •W1/M1 = emergency tax code (temporary, should be corrected)
  • •Compare gross pay to your contract to spot discrepancies
What does the W1 or M1 code on my payslip mean?+

W1 (weekly) or M1 (monthly) means you're on an emergency tax code. Your employer is taxing each pay period independently rather than cumulatively. This often happens when starting a new job before HMRC sends your correct code. Contact HMRC if it persists beyond 2–3 months.

National Insurance Contributions

National Insurance (NI) is your second-biggest deduction after income tax. In 2026/27, employees pay 8% on earnings between £12,570 and £50,270, and 2% on everything above. NI funds the State Pension, NHS, and welfare system. Unlike income tax, NI doesn't have a personal allowance system beyond the primary threshold. Check your NI category letter (usually 'A') — if you're under 21 or an apprentice under 25, you may pay a lower rate on earnings up to £50,270.
  • •Employee NI rate: 8% between £12,570–£50,270, 2% above
  • •Employer also pays NI on top (not deducted from your pay)
  • •NI builds your State Pension entitlement (need 35 qualifying years)
  • •Category A is standard — check yours is correct
  • •Under 21s and apprentices under 25 may have a reduced rate

Pension Contributions

Under auto-enrolment, most employees contribute at least 5% of qualifying earnings (between £6,240 and £50,270) to their workplace pension, with the employer adding at least 3%. Your payslip should show your pension deduction clearly. If your employer uses salary sacrifice for pensions, your gross pay will appear lower (because the pension goes in before tax), but this is actually more tax-efficient. Check that the amount matches what you've agreed — payroll errors with pension contributions are more common than you'd think.
  • •Minimum employee contribution: 5% of qualifying earnings
  • •Minimum employer contribution: 3%
  • •Salary sacrifice pensions reduce your gross pay on paper but save NI
  • •Verify the deduction matches your agreed contribution rate
  • •Check if you're contributing enough to get maximum employer matching
Should I opt out of my workplace pension?+

Almost never. You'd be giving up free money from your employer's contributions and tax relief from the government. Even if finances are tight, keeping at least the minimum contribution ensures you benefit from employer matching.

Spotting Errors and Taking Action

Check your payslip every month — don't just glance at the net pay. Common errors include wrong tax codes (costing hundreds per year), missing overtime or bonus payments, incorrect pension contribution rates, and being charged for student loan repayments you've already paid off. If you spot an error, raise it with your payroll department immediately and follow up in writing. For tax code issues, contact HMRC directly on 0300 200 3300 or through your Personal Tax Account online. Track your net pay in SYM so you'll immediately notice if something changes unexpectedly.
  • •Check your payslip every month, not just net pay
  • •Verify your tax code matches your circumstances
  • •Confirm pension contributions are at the right rate
  • •Check student loan deductions stop after full repayment
  • •Contact HMRC on 0300 200 3300 for tax code issues
  • •Track net pay in SYM to spot unexpected changes
#payslip#tax#deductions#uk finance

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