UK Payslip Explained: Every Field, Deduction, and Code

A UK payslip is a document your employer must provide every pay period showing your gross pay, all deductions, and your net (take-home) pay. Those deductions typically include Income Tax — collected through PAYE tax codes like 1257L — National Insurance contributions, pension auto-enrolment contributions, and, where applicable, student loan repayments. Under the Employment Rights Act 1996, employers are legally required to issue an itemised pay statement before or on each payday, whether you're paid weekly, fortnightly, or monthly.

Approximately 30.3 million employees are paid through the UK's PAYE system, and every one of them receives an itemised payslip. If you've ever glanced at yours and skipped straight to the bottom number, you're not alone. But understanding what sits between gross pay and net pay matters — it's how you confirm you're on the right tax code, verify your pension contributions are correct, and catch errors before they compound across multiple pay periods.

What Each Section of Your Payslip Covers

A typical UK payslip is organised into five blocks. Here's what each one tells you:

1. Personal and employment details Your name, employee or payroll number, National Insurance (NI) number, the pay period covered, payment date, and payment method (BACS, cheque, or cash). This is your identifier — if any of these are wrong, flag it with payroll immediately, because errors here can affect your tax record with HMRC.

2. Earnings Everything your employer is paying you before deductions. This includes your basic pay, plus any overtime, bonuses, commission, shift allowances, or other taxable and non-taxable payments. Each component should appear as a separate line so you can see exactly where your gross figure comes from.

3. Deductions This is the section most people find confusing — and the one this guide breaks down in detail. Core deductions include:

• Income Tax (PAYE) — calculated using your tax code, which HMRC assigns based on your personal allowance and any adjustments
• National Insurance (NI) — contributions toward state benefits, calculated against earnings thresholds
• Pension contributions — your auto-enrolment deduction, shown as either a percentage or fixed amount
• Student loan repayments — if you have a Plan 1, Plan 2, Plan 4, or Postgraduate Loan, deductions start once you earn above the relevant threshold
• Attachment of earnings orders — court-ordered deductions for debts such as council tax arrears or child maintenance

Each of these is covered in its own section below.

4. Net pay The amount actually transferred to your bank account after all deductions. This is your take-home pay. If net pay has changed unexpectedly between pay periods and your gross hasn't, the cause is almost always a shift in one of the deduction lines above.

5. Year-to-date (YTD) totals Cumulative figures for gross pay, tax paid, NI contributions, and pension deductions since the start of the tax year (6 April). These running totals are essential for checking your position against your annual personal allowance and for reconciling against your guide to reading your P60 at year end.

Digital payslips and paper payslips carry identical legal requirements — the Employment Rights Act applies regardless of format. Your employer can issue your payslip through an online portal, an app, email, or on paper, provided every required field is present. If your employer does not provide a payslip at all, you can raise the issue with ACAS or pursue a claim through an employment tribunal — the right to an itemised pay statement is enforceable.

If you're familiar with US pay stubs and trying to map that knowledge onto the UK format, the structures differ significantly — PAYE tax codes, National Insurance categories, and auto-enrolment have no direct US equivalent. Our guide to reading a US pay stub covers the American format for comparison.

---

PAYE Tax Codes: What Every Code on Your Payslip Means

Your tax code is the single most important factor determining how much Income Tax leaves your pay each month. HMRC assigns a tax code to every employee, and your employer uses it to calculate the exact deduction for each pay period under the Pay As You Earn (PAYE) system. The code reflects your Personal Allowance — the amount you can earn tax-free — adjusted for any benefits, additional income, or underpaid tax from previous years.

Understanding what your code means lets you verify your payslip is correct before the money ever leaves your account.

The Standard Code: 1257L

Most employees in England, Wales, and Northern Ireland see 1257L on their payslip for the 2025/26 tax year. The number portion represents your tax-free earnings allowance: multiply it by 10 to get the actual figure. So 1257 × 10 = £12,570, which is the current Personal Allowance.

The letter L confirms you receive the standard free pay allowance with no unusual adjustments. If your code shows a different number — say 1185L — it means HMRC has reduced your allowance, often to collect tax owed on a benefit-in-kind or to recover an underpayment from a previous year. Multiply that number by 10 and you know your adjusted tax-free amount: £11,850 in this example.

Your employer spreads this allowance evenly across pay periods. On a monthly payroll, you receive £1,047.50 of tax-free pay each month (£12,570 ÷ 12). Earnings above that threshold are taxed at the applicable rates.

BR, D0, and D1: Flat-Rate Codes

These codes carry no Personal Allowance at all. Every penny of income from the employment is taxed at a single rate:

• BR — Basic Rate. All earnings taxed at 20%. Common on a second job or occupational pension where your full allowance is already applied to your main employment.
• D0 — Higher Rate. All earnings taxed at 40%. Used when your primary income already exceeds the basic rate band.
• D1 — Additional Rate. All earnings taxed at 45%. Applied when total income from other sources already pushes you into the additional rate band.

If you only have one job and see BR, D0, or D1 on your payslip, something is likely wrong. Your Personal Allowance should be allocated to your main source of income, and you should check your coding notice from HMRC.

K Codes: When Deductions Exceed Your Allowance

K codes are one of the least understood entries on a UK payslip, and most guides gloss over them. A K code appears when the value of your untaxed benefits and adjustments exceeds your Personal Allowance, effectively creating negative free pay.

Here is how it works in practice. Suppose you receive a company car benefit valued at £15,000 for tax purposes. Your Personal Allowance is £12,570, but the benefit-in-kind exceeds it by £2,430. HMRC issues a code of K243, meaning your employer adds £2,430 to your taxable pay for the year rather than subtracting a free pay amount.

The result: you pay tax on your actual salary plus the excess amount, spread across the remaining pay periods. HMRC applies a critical safeguard here — the additional tax collected through a K code can never exceed 50% of your gross pay in any single pay period. This cap prevents a situation where deductions consume most of your wage.

If you have a K code and are unsure why, review your P11D (the form listing your benefits-in-kind) and your HMRC coding notice. Common triggers include company cars, private medical insurance, and outstanding tax debts being collected through your code.

Emergency Tax Codes: W1, M1, and X

When HMRC has not yet confirmed your correct tax code, your employer applies an emergency tax code. On your payslip, this typically appears as 1257L W1 (weekly paid), 1257L M1 (monthly paid), or sometimes just W1 or M1 alongside the code. You may also see X used as a generic non-cumulative marker.

Emergency codes appear most often when you:

• Start a new job without providing a P45 from your previous employer
• Return to UK employment after working abroad
• Begin receiving a company pension for the first time

The defining characteristic of an emergency code is that it operates on a non-cumulative basis. Each pay period is calculated in complete isolation, with no reference to what you earned or paid in tax earlier in the year. This matters because it can cause you to overpay or underpay tax compared to what you actually owe.

Once HMRC processes your details and issues the correct code, your employer switches to a cumulative basis. At that point, all your year-to-date earnings and tax payments are recalculated, and any overpayment is refunded through your next payslip. You do not need to wait until the end of the tax year — the correction happens automatically once the cumulative code is applied.

Cumulative vs Non-Cumulative: Why the Basis Matters

Every tax code operates on one of two bases, and the distinction directly affects your take-home pay:

Cumulative (the standard basis) takes into account everything earned and all tax paid from 6 April to the current pay date. If your code changes mid-year — say from BR to 1257L — your employer recalculates your total tax liability for the year so far and adjusts your next payment accordingly. This often produces a noticeable refund in the first pay period after the correction.

Non-cumulative (Week 1 / Month 1) ignores prior pay periods entirely. Your tax-free allowance and rate bands are applied only to the current period's earnings. This prevents large refunds or underpayments accumulating but can result in an incorrect annual tax total. Non-cumulative codes are a temporary measure; HMRC will eventually issue a cumulative code.

On your payslip, look for W1, M1, or X printed next to or below the tax code. If none of these markers appear, your code is cumulative.

Scottish S Prefix Codes

If your main residence is in Scotland, HMRC assigns an S prefix to your tax code — for example, S1257L. The Personal Allowance remains the same (£12,570 for 2025/26), but Scotland sets its own income tax rates and bands, which differ from those in England and Northern Ireland.

The 2025/26 Scottish Income Tax bands are:

Band	Taxable Income	Rate
Starter Rate	£12,571 – £14,876	19%
Basic Rate	£14,877 – £26,561	20%
Intermediate Rate	£26,562 – £43,662	21%
Higher Rate	£43,663 – £75,000	42%
Advanced Rate	£75,001 – £125,140	45%
Top Rate	Over £125,140	48%

Scottish taxpayer status is determined by your main place of residence, not where your employer is based or where you physically work. If you move to or from Scotland during the tax year, HMRC updates your code and the S prefix is added or removed accordingly.

The practical effect: a Scottish employee earning £50,000 pays more income tax than someone on the same salary in England, because earnings between £26,562 and £43,662 are taxed at 21% (not 20%), and earnings between £43,663 and £75,000 are taxed at 42% (not 40%).

Welsh C Prefix Codes

Welsh taxpayers see a C prefix on their tax code (e.g., C1257L). The Welsh Government has the power to set the Welsh Rate of Income Tax, though for 2025/26 the rates remain aligned with England and Northern Ireland (20%, 40%, 45%). A C1257L code currently produces the same deductions as a plain 1257L. The prefix exists because the Welsh Government retains the authority to vary rates in future years, and HMRC needs to identify Welsh taxpayers in advance. As with Scottish codes, status is based on your main place of residence.

What to Do If Your Tax Code Looks Wrong

Your employer cannot change your tax code — only HMRC has that authority. If the code on your payslip does not match what you expect, take these steps:

1. Check your HMRC coding notice (form P2), which explains how your code was calculated and lists every adjustment. You can view this through your Personal Tax Account on GOV.UK.
2. Compare the breakdown against your actual circumstances. Look for outdated benefits-in-kind, old employment income that no longer applies, or missing allowances.
3. Contact HMRC directly if something is wrong. You can call, use the online chat, or update your details through your Personal Tax Account. HMRC will issue a revised code to your employer, and any overpaid tax will be corrected through your payroll.

Do not wait until the end of the tax year. The sooner HMRC corrects your code, the sooner your monthly take-home pay reflects the right amount.

National Insurance: Categories, Thresholds, and What You Pay

National Insurance is a separate tax from Income Tax, even though both are deducted through your payroll. While Income Tax funds general government spending, National Insurance contributions (NICs) fund specific entitlements: the State Pension, the NHS, and contributory benefits such as Maternity Allowance and contribution-based Jobseeker's Allowance. Each pay period, HMRC records your contributions against your National Insurance number, building a personal record that determines your future State Pension entitlement.

Your payslip will show an NI category letter — a single character that tells payroll software which rates and thresholds to apply. Most employees never need to think about it, but checking yours is worth the few seconds it takes.

NI Category Letters

Letter	Who It Applies To	Key Detail
A	Most employees aged 21 and over	Standard rates; the default for the majority of workers
B	Members of certain contracted-out pension schemes	Pre-April 2016 only; now rare but still appears on some older records
C	Employees over State Pension age	No employee NI is deducted, but the employer still pays their share
H	Apprentices under 25	Employer pays no NI on earnings up to the Upper Secondary Threshold
M	Employees under 21	Reduced employer NI up to the Upper Secondary Threshold; employee rates are the same as category A
Z	Under-21s who are deferring NI	Rare; applies when a second job means NI is deferred on this employment

If your category letter is wrong — for example, you turned 21 and payroll still has you on category M — your deductions may be correct on the employee side, but your employer could be underpaying their share. Flag it with HR or your payroll team.

2025/26 Thresholds and Rates (Category A)

For the standard category A employee, National Insurance deductions in the UK are calculated across two earnings bands:

• Primary Threshold (PT): £242 per week / £1,048 per month. You pay no employee NI on earnings up to this point.
• Upper Earnings Limit (UEL): £967 per week / £4,189 per month. A lower rate applies above this level.

The employee rates are:

• 8% on earnings between the PT and the UEL
• 2% on earnings above the UEL

So if your gross monthly pay is £3,500, your employee NI calculation looks like this: (£3,500 − £1,048) × 8% = £196.16. Because £3,500 falls below the UEL, the 2% band does not apply.

Employer National Insurance

Your employer also pays NI on your earnings, but at different rates and from a lower starting point:

• Secondary Threshold (ST): £96 per week / £417 per month
• Employer rate: 15% on all earnings above the ST

This means employer NI kicks in much earlier than employee NI and at a higher percentage. Some payslips include an "Employer NI" or "Employer's NIC" line. This is not deducted from your pay — it is an additional cost borne by your employer. Showing it is voluntary, but many employers include it for transparency.

Why Your NI Record Matters

Unlike Income Tax, your National Insurance contributions build a personal entitlement record held by HMRC. You typically need 35 qualifying years of contributions to receive the full new State Pension. Gaps in your record — from career breaks, time abroad, or payroll errors — can reduce your eventual pension. You can check your NI record at any time through your Personal Tax Account on the GOV.UK website, and it is worth doing so every few years to catch any missing years early enough to fill them voluntarily.

Student Loan and Postgraduate Loan Deductions

Student loan repayments in the UK are not collected by the Student Loans Company (SLC) directly from your bank account. Instead, the SLC notifies HMRC that you have an outstanding loan, and HMRC issues a Start Notice to your employer instructing them to begin deducting repayments through payroll. This means your UK student loan payslip deduction is handled the same way as tax and National Insurance — automatically, each pay period.

Repayment Plans, Thresholds, and Rates (2025/26)

There are five distinct repayment categories, each with its own annual threshold and rate:

Plan	Who It Applies To	Annual Threshold	Rate
Plan 1	England/Wales loans taken before September 2012; all Northern Ireland loans	£24,990	9%
Plan 2	England/Wales loans taken from September 2012	£27,295	9%
Plan 4	Scottish student loans	£31,395	9%
Plan 5	England loans taken from September 2023 under the new funding system	£25,000	9%
Postgraduate Loan (PGL)	Postgraduate Master's or Doctoral loans	£21,000	6%

The repayment percentage applies only to earnings above the threshold, not to your entire salary. For example, on Plan 2 with an annual salary of £35,000, you repay 9% of £7,705 (the amount above £27,295), which works out to roughly £693 per year or £57.75 per month.

How Stacking Works

You can have both a student loan plan and a postgraduate loan deducted at the same time. The two are calculated independently — the thresholds and rates do not combine or interact. If you are on Plan 2 and also have a PGL, your employer applies the 9% rate to earnings above £27,295 for the student loan and, separately, the 6% rate to earnings above £21,000 for the postgraduate loan. Both deductions appear on the same payslip, and the total can be a noticeable portion of your gross-to-net difference.

Identifying Your Plan on the Payslip

Most payroll systems label student loan deductions using shorthand codes: SL1, SL2, SL4, SL5, or PGL. Some systems use longer descriptions such as "Student Loan Plan 2" or simply "Student Loan." Where both a student loan and postgraduate loan are active, they are usually listed as separate line items, though a small number of payroll platforms show a single combined figure. If your payslip shows only one line and you know you have both loan types, check with your payroll department to confirm both are being collected correctly.

Pay-Period Calculation, Not Annual

Repayments are calculated per pay period, not across the full tax year. Your employer converts the annual threshold into a monthly (or weekly) equivalent and applies the rate to that period's earnings alone. This means if your monthly pay dips below the monthly threshold in a given month — due to reduced hours, unpaid leave, or a mid-month start date — no deduction is made that month, even if your annual salary sits well above the annual threshold. Any over- or under-payment across the year can be reconciled through self-assessment, but the default payroll mechanism is strictly period-by-period.

Wrong Plan Type: A Common Error

One of the more frequent payslip mistakes involves being placed on the wrong repayment plan. Because Plan 1 and Plan 2 have different thresholds, an incorrect plan assignment can mean you are repaying too much or too little each month. If the plan code on your payslip does not match the plan shown on your SLC online account, raise it with your employer and HMRC promptly. The process for catching and correcting this is covered in the error-detection section below.

Pension Auto-Enrolment: What Your Payslip Shows

Since 2012, under rules set by The Pensions Regulator, employers must automatically enrol eligible workers into a qualifying workplace pension. These rules apply uniformly across England, Scotland, Wales, and Northern Ireland — pension regulation is not devolved. You qualify if you are aged 22 to State Pension age and earn above £10,000 per year. If you have been enrolled and decide to opt out, your employer is required to re-enrol you every three years.

Minimum Contribution Rates

For 2025/26, the total minimum contribution is 8% of qualifying earnings, split as follows:

Source	Minimum Rate
Employee	5%
Employer	3%

Many employers contribute above the 3% floor, so check your pension scheme documents or benefits portal for the exact rate that applies to you.

What "Qualifying Earnings" Means for Your Deduction

Contributions are not calculated on your entire salary. They apply to earnings within a specific band: £6,240 to £50,270 per year (2025/26 figures). The first £6,240 of your annual earnings is excluded entirely.

For example, if you earn £30,000 a year, your qualifying earnings are £30,000 minus £6,240, which gives £23,760. Your 5% employee contribution would be calculated on that £23,760 figure — roughly £1,188 per year, or £99 per month.

Some employers use a different calculation basis, such as total gross pay, provided their scheme still meets the minimum overall contribution requirements. If your deduction looks higher than the band-based calculation would suggest, this is likely the reason.

How Pension Appears on Your Payslip

Look for a line labelled "Pension" or "AE Pension" in the deductions section. This shows your employee contribution — the amount subtracted from your pay. Some payslips also display the employer contribution as a separate informational line, but that figure is not deducted from your pay. It is an additional cost your employer bears, paid directly into your pension pot on top of your wages.

Salary Sacrifice Pension Schemes

If your gross pay is lower than the salary in your contract, you are probably on a salary sacrifice pension scheme. Under this arrangement, you agree to reduce your contractual gross pay, and your employer redirects the difference into your pension. The effect on your payslip is distinctive:

• Gross pay appears lower than your headline salary
• Pension contribution appears larger, because it includes the sacrificed amount

The financial benefit is that neither you nor your employer pays National Insurance on the sacrificed portion. If your contract states a salary of £35,000 but you sacrifice £2,000 into your pension, your payslip will show gross pay of £33,000. This is not an error — it reflects the revised contractual pay after the sacrifice.

Because NI savings apply to both sides, salary sacrifice schemes are increasingly common. For a contrasting example of how another country handles mandatory employer-managed payslip deductions, see Singapore's CPF payslip requirements.

Statutory Payments, Attachment Orders, and Other Deductions

Beyond the standard PAYE, National Insurance, and pension lines, your payslip may include entries that only appear in specific circumstances. Statutory payments, court-ordered deductions, and year-to-date running totals each follow distinct rules, and understanding them prevents unnecessary confusion when your pay looks different from the norm.

Statutory Payments

Statutory payments appear as additions on your payslip, not deductions. They replace your normal earnings during qualifying absences, and your employer pays them through the regular payroll. All statutory payments remain subject to PAYE tax and National Insurance because they count as taxable income.

Statutory Sick Pay (SSP) is paid at £118.75 per week (2025/26 rate) when you are off sick for four or more consecutive days. The first three qualifying days are unpaid waiting days. SSP continues for up to 28 weeks, after which you would move to Employment and Support Allowance if still unfit for work. Your payslip will show SSP in place of your usual salary for the period of absence, and some employers top it up to full or partial pay under an occupational sick pay scheme.

Statutory Maternity Pay (SMP) splits into two phases. For the first 6 weeks, you receive 90% of your average weekly earnings with no cap. For the remaining 33 weeks, the rate drops to £187.18 per week or 90% of average weekly earnings, whichever is lower. SMP replaces your normal earnings line on the payslip throughout the 39-week payment window.

Statutory Paternity Pay (SPP) is paid at £187.18 per week (or 90% of average weekly earnings if that figure is lower) for up to 2 weeks. It appears as a distinct line item during the paternity leave period.

Shared Parental Pay (ShPP) follows the same weekly rate as SPP and SMP's lower-rate phase. Parents can share up to 37 weeks of pay between them, and the payslip labels this separately so you can track how many weeks have been claimed.

Attachment of Earnings Orders

An Attachment of Earnings Order (AEO) is a court-directed instruction requiring your employer to deduct money from your pay to settle a debt. Common reasons include council tax arrears, child maintenance obligations, and unpaid fines. Your employer has no discretion here — the deduction is a legal obligation.

AEOs come in two forms:

• Fixed deductions take a set amount each pay period, specified by the court.
• Percentage-based deductions are calculated against your net earnings using tables set out under the Attachment of Earnings Act. The percentage rises as net pay increases, so higher earners pay a larger proportion.

Both types are deducted after tax and National Insurance, meaning they reduce your take-home pay but do not affect your taxable income. If you have multiple AEOs, there is a statutory priority order that determines which gets paid first. Child maintenance orders from the Child Maintenance Service, for instance, typically take precedence over council tax arrears.

Year-to-Date Cumulative Totals

Most payslips include a YTD column showing cumulative figures for the current tax year, which runs from 6 April to 5 April. The standard YTD lines cover:

• Total gross pay earned so far this tax year
• Total PAYE tax deducted
• Total National Insurance contributions (employee side)
• Total pension contributions

These running totals matter because PAYE operates on a cumulative basis. When your tax code changes mid-year, HMRC recalculates what you owe using the YTD figures, which can result in a larger or smaller deduction in the next pay period to correct the balance. At the end of the tax year, your YTD totals should match the figures on your P60 exactly. If they do not, raise the discrepancy with your payroll department before the new tax year is well underway, as corrections become harder to process after the employer's final PAYE submission.

Other Deduction Lines

Several additional items may appear depending on your employer's benefits package:

• Trade union subscriptions deducted at source under a check-off arrangement with your employer.
• Give As You Earn (GAYE) / payroll giving — charitable donations taken before tax, reducing your taxable pay and giving you immediate tax relief.
• Cycle-to-work salary sacrifice — a pre-tax deduction that lowers your gross pay in exchange for a bicycle and accessories, reducing both your income tax and NI liability.
• Childcare vouchers — a closed scheme (no new entrants since October 2018) where existing members still see a salary sacrifice deduction of up to £243 per month tax-free.
• Season ticket loans — an interest-free advance from your employer repaid in equal instalments across the year, shown as a post-tax deduction.

Each of these lines will be labelled individually on your payslip, and the amounts should correspond to what you agreed when you enrolled in the scheme.

---

UK Payslip Abbreviations: Quick-Reference Guide

Payroll systems use dozens of shorthand codes, and the exact labels vary by provider. The table below covers the UK payslip abbreviations most likely to appear on yours.

Earnings

Abbreviation	Meaning
Basic	Basic salary or wages
OT	Overtime
Comm	Commission
Bonus	Bonus payment
Arr	Arrears (back-pay owed from a previous period)
Hol	Holiday pay
Shift	Shift allowance

Tax

Abbreviation	Meaning
PAYE	Pay As You Earn (income tax collected by your employer)
Tax Code	HMRC-issued code that determines your tax-free allowance
NI	National Insurance
NI Cat	National Insurance category letter (e.g. A, B, C, H, M)
NI No.	Your National Insurance number
PT	Primary Threshold (the earnings level where NI contributions begin)
UEL	Upper Earnings Limit (the ceiling above which the NI rate drops)

Student Loans

Abbreviation	Meaning
SL1	Student Loan Plan 1 deduction
SL2	Student Loan Plan 2 deduction
SL4	Student Loan Plan 4 deduction (Scottish loans)
SL5	Student Loan Plan 5 deduction
PGL	Postgraduate Loan deduction

Pension

Abbreviation	Meaning
AE	Auto-Enrolment
EE Pension	Employee pension contribution (your share)
ER Pension	Employer pension contribution (your employer's share)
Sal Sac / SS	Salary Sacrifice (pension contributions taken before tax)
AVCs	Additional Voluntary Contributions

Statutory Payments

Abbreviation	Meaning
SSP	Statutory Sick Pay
SMP	Statutory Maternity Pay
SPP	Statutory Paternity Pay
ShPP	Shared Parental Pay
SAP	Statutory Adoption Pay

Other Deductions

Abbreviation	Meaning
AEO	Attachment of Earnings Order
CO	Court Order deduction
GAYE	Give As You Earn (charitable donations via payroll)
TU Subs	Trade Union subscriptions

Totals

Abbreviation	Meaning
Gross	Total pay before any deductions
Net	Take-home pay after all deductions
YTD	Year To Date (cumulative figure since 6 April)
Tax TD	Tax deducted to date in the current tax year
NI TD	National Insurance contributions to date in the current tax year

If you also review payroll across Europe, this English guide to German payslip abbreviations and deductions is a useful comparison point because German salary slips label tax class and social insurance in a different format.

If you spot an abbreviation that does not appear here, it is likely specific to your employer's payroll software. Check the legend printed on the payslip itself, or contact your HR or payroll team for a definition.

---

How to Spot Common Payslip Errors

Checking your payslip takes roughly two minutes. Skipping that check can cost you hundreds or even thousands of pounds over a tax year. Most payslip errors are not deliberate — they stem from outdated records, delayed HMRC notifications, or manual data-entry mistakes — but the financial impact lands on you until the error is corrected.

Use the following checklist against your most recent payslip.

Wrong tax code

Pull up your most recent HMRC coding notice (the P2 letter, or check your Personal Tax Account online) and compare it to the tax code printed on your payslip. Mismatches happen when:

• HMRC carries forward a benefit-in-kind from a previous employer that no longer applies to you.
• An emergency tax code (often 1257L M1 or W1) was applied when you started and never updated to a cumulative basis.
• A marriage allowance transfer was approved but not yet reflected in payroll.

A single tax-code digit out of place can shift your monthly tax bill by £50 to £300 or more, depending on your salary band.

Incorrect NI category letter

Most employees under State Pension age should see Category A. If you are under 21, you should be on Category M; under 25 and on a qualifying apprenticeship, Category H. After you pass the relevant age threshold, your employer's payroll system should switch you to Category A automatically — but it does not always happen on time.

If the wrong category letter appears, your NI deductions will be calculated against the wrong thresholds and rates. Cross-reference the category on your payslip with the criteria outlined in the National Insurance section earlier in this article.

Missing or incorrect pension contributions

Verify three things:

1. The employee contribution percentage matches your scheme's expected rate (the legal minimum for auto-enrolment is 5% of qualifying earnings, though your scheme may specify a higher rate).
2. The employer contribution is at least 3% of qualifying earnings unless your scheme sets a different floor.
3. For salary sacrifice arrangements, confirm that your gross pay has been reduced by the correct amount and that the pension contribution line reflects the total (your sacrifice plus the employer's share).

Missing pension contributions may indicate your employer is not meeting its auto-enrolment obligations — a matter The Pensions Regulator takes seriously.

Wrong student loan plan

Employees occasionally get assigned to Plan 2 when they should be on Plan 1, or vice versa. Because each plan has a different repayment threshold and rate, the wrong plan means you are either overpaying or underpaying each month. Check the plan type shown on your payslip against your original student loan agreement or any correspondence from the Student Loans Company. The same applies to Postgraduate Loan deductions, which should appear as a separate line if applicable.

Gross pay discrepancy

Compare the basic pay figure on your payslip to the gross salary in your employment contract, pro-rated for the pay period. If you worked overtime, earned a bonus, or received an allowance, those should appear as clearly labelled additions. Common triggers for discrepancies include mid-period pay rises that payroll backdated incorrectly, or overtime calculated at the wrong hourly rate. If your basic pay does not match your contractual rate — even by a small amount — flag it before the error compounds across future periods.

YTD totals that do not add up

Your year-to-date figures for gross pay, tax, NI, and pension contributions should broadly equal the sum of all individual pay periods since 6 April. A significant discrepancy — more than a few pence of rounding — can indicate a payroll error in a prior period that was never corrected. Comparing your current YTD total to last month's YTD plus this month's figure is the fastest way to isolate which period introduced the variance.

What to do when you find an error

1. Raise it with your employer's payroll or HR department first. Most errors are corrected in the next pay run once identified. Keep a written record of your query and the response.
2. For tax code issues, contact HMRC directly through the Personal Tax Account, the HMRC app, or by phone. HMRC will issue a revised coding notice to your employer if the code is wrong.
3. For pension auto-enrolment disputes that your employer does not resolve, contact The Pensions Regulator.
4. For student loan plan errors, contact the Student Loans Company to confirm your correct plan type, then notify your employer's payroll team.

When a payroll team processes hundreds of payslips per cycle, manual spot-checking cannot catch every wrong tax code or missing pension contribution. Organisations that need to verify payslip data across large employee populations increasingly use payroll OCR for extracting payslip data at scale to flag discrepancies systematically before they reach employees.