How to Read Your Pay Stub (US) or Payslip (UK): A Line-by-Line Guide for Young Professionals

Your paycheck has two numbers that matter

Every pay stub or payslip tells the same story: gross pay (what your employer owes you) and net pay (what actually lands in your account). The gap between them is not money disappearing — it is taxes, insurance, and savings deductions, many of which you chose or can influence. Understanding each line turns payday from a shrug into a monthly money review.

Reading a US pay stub, line by line

American pay stubs break deductions into three families: federal taxes, state/local taxes, and FICA (the payroll taxes that fund Social Security and Medicare).

1. Federal income tax withholding

This is estimated tax taken from each paycheck based on your Form W-4. It is not your final tax bill — just a running payment toward it. If you started a job and never updated your W-4, the withholding may be off, which is why some people owe at tax time and others get big refunds.

2. State and local taxes

Most states take their own income tax slice (a handful have none). Some cities levy their own tax too. These lines look small individually but add up, so check the year-to-date (YTD) column to see the real total.

3. FICA: Social Security and Medicare

FICA has two pieces, and they behave differently:

  • Social Security (OASDI): 6.2% on the first $184,500 of 2026 earnings. Above that wage base, the deduction stops for the rest of the year — which is why very high earners sometimes see take-home pay jump late in the year. Your employer matches that 6.2%.
  • Medicare: 1.45% with no cap, matched by your employer, plus an additional 0.9% Medicare tax on earnings above $200,000 ($250,000 for married filing jointly) that is not matched.

4. Pre-tax vs. post-tax deductions

This is the line people misunderstand most. Pre-tax deductions — traditional 401(k) contributions, health insurance premiums, HSA contributions, commuter benefits — come out before income tax is calculated, so they shrink your taxable pay. Post-tax deductions — Roth 401(k), disability insurance premiums — come out after tax. If your stub shows both, you are splitting retirement savings between tax-now and tax-later buckets.

5. The employer match you may be leaving behind

Your stub usually shows employer 401(k) contributions separately. Compare it to what you put in: if your plan matches 50% of the first 6% and you contribute less than 6%, you are quietly declining a raise.

Reading a UK payslip, line by line

UK payslips run on PAYE (Pay As You Earn). The big lines are income tax and National Insurance — separate calculations, separate thresholds.

1. Income tax

For the 2026/27 tax year, the personal allowance is £12,570 — the amount you earn before income tax kicks in. Above that: 20% on earnings up to £50,270, 40% from £50,271 to £125,140, and 45% beyond. Your tax code (commonly 1257L) tells payroll which allowance to apply — a wrong code, especially after changing jobs, is one of the most common reasons for overpaying tax.

2. National Insurance (NICs)

Employees pay 8% on earnings between £12,570 and £50,270, then 2% above £50,270. Unlike income tax, NICs are worked out per pay period, not across the whole year — another reason two months can look oddly different.

3. Workplace pension

Under auto-enrolment, at least 8% of qualifying earnings normally goes into your pension (minimum 3% from your employer). Salary-sacrifice arrangements are even better: the pension contribution is taken before tax and NI are calculated, so you save NICs too.

4. Student loan repayments

These are not tax — they are a percentage of earnings above a threshold, taken from gross pay before tax is calculated. Check your plan type, because the thresholds differ, and remember the deduction stops when the loan is repaid.

The 5-minute payday check

Run this once a month and your stub becomes a free financial review:

  • Is gross pay right? Compare hours, overtime, or bonus against expectations. Payroll errors are real and you are the only auditor you have.
  • Is your tax code or withholding still correct? After a raise, bonus, or job change, re-check. The UK's 1257L code and the US W-4 both drift out of date.
  • Is your full retirement match captured? Small shortfall, easy fix, compounding consequences.
  • Are pre-tax deductions maximized? HSA, traditional 401(k), or salary sacrifice — every pound or dollar moved pre-tax is tax saved.
  • Does net pay reconcile with the bank? Glance at YTD totals too — a slow leak (duplicate benefit deductions, an old garnishment) hides in single-pay views.

Red flags worth acting on this week

Any of these deserves a message to payroll or HR, not just a shrug: a tax code you do not recognize, zero employer match despite contributing, two different benefit deductions for the same cover, pension contributions that never rose with your raise, or NI/tax lines that do not move when pay does.

General educational information only — not tax, investment, or legal advice. Tax rules and thresholds change; confirm anything borderline with a qualified professional or official sources.


 

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