Understanding Your Payslip
5 min read Article Updated 2026-05-19
Landing your first graduate job is a monumental achievement. You have aced the interviews, signed the contract, and put in your first month of hard work. Then, the moment arrives. You receive your notification that you have been paid.
However, when you open that PDF or envelope, the number at the bottom might look significantly different from the annual salary figure you discussed during your interview. That gap is PAYE (Pay As You Earn), National Insurance, and Student Loan repayments.
It is vital to understand exactly where your money is going. Not only does this ensure you are being paid correctly, but it also helps you spot tax errors early before they become expensive problems. The rest of this article walks through every line of your payslip.
The anatomy of a payslip
While every company uses a slightly different layout, the legal requirements for what must appear on a payslip are the same. Generally, the document is split into three core areas: your information, payments (credits), and deductions (debits).
1. Payments (Gross Pay)
This is the left-hand column on most slips. It lists every penny you have earned before the government takes its share.
- Basic Salary: Your standard monthly wage.
- Overtime: Any extra hours worked.
- Bonus/Commission: Performance-related pay common in sales or recruitment roles.
- Expenses: Reimbursements for costs you have incurred (these are often tax-free).
2. Deductions
This is the right-hand column, often the source of confusion (and frustration) for new graduates.
- PAYE Tax: Income tax.
- National Insurance: Contributions for state benefits.
- Student Loan: Repayments for your university tuition.
- Pension: Your contribution to your retirement fund.
Net Pay
Located at the bottom of the page, this is the most important number. This is the actual amount that lands in your bank account after all deductions have been made. Always budget based on this figure, not your gross salary.
Decoding your tax code
Your tax code is a short alphanumeric string that tells your employer how much tax to deduct from your pay. You will usually find this in the top header of your payslip.
The Standard Code: 1257L
For the current tax year, the most common code for a graduate with one job and no special circumstances is 1257L.
This means you have a tax-free Personal Allowance of £12,570 a year. You only pay income tax on earnings above this threshold. The ‘L’ signifies that you are entitled to the standard tax-free personal allowance.
Emergency Tax Codes
If you see 1257 W1, 1257 M1, or 1257 X, you are on an emergency tax code. This usually happens if HMRC does not have your income details in time for your first payday. While you will pay tax on all your income above the basic threshold for that specific pay period, it usually corrects itself automatically once HMRC updates your records. You can check your tax code status directly on the GOV.UK website.
National insurance (NI)
Unlike income tax, National Insurance is not calculated on an annual basis but on a pay-period basis. This means if you earn a large bonus in one month, your NI contributions might spike for that month specifically.
You need a National Insurance number to work in the UK. This ensures your contributions are recorded against your name, building up your entitlement to certain state benefits, including the State Pension. If you have lost your number, you can find it in your personal tax account or on the official government portal.
The graduate tax: student loans
If you took out a loan for university, you will likely see a deduction labeled ‘Student Loan’ or ‘CSL’ (Commencing Student Loan). You do not pay this directly to the Student Loans Company; it is taken automatically via the tax system.
Repayments are calculated as a percentage of your earnings over a certain threshold. The threshold depends on which ‘Plan’ you are on:
- Plan 1: Typically for students who started before 2012.
- Plan 2: Typically for students who started between 1 Sept 2012 and 31 July 2023. This is the most common plan for current recent graduates.
- Plan 5: For students starting courses on or after 1 August 2023.
- Postgraduate Loan: A separate repayment threshold applies here.
If you have a Postgraduate loan and an Undergraduate loan, you will pay back both simultaneously (essentially two separate deductions), which can significantly impact your take-home pay.
Workplace Pensions
Under the Pensions Act 2008, every employer in the UK must put certain staff into a workplace pension scheme and contribute towards it. This is called ‘automatic enrolment’.
You will usually contribute 5% of your qualifying earnings, and your employer will contribute at least 3%. You will see this 5% leaving your payslip, but it is not lost money. It is deferred salary being invested for your future. Plus, it is taken from your gross pay, meaning you pay less tax immediately.
While you can opt out, it is rarely advised. Opting out is essentially turning down free money from your employer.
What to do if your payslip looks wrong
Mistakes happen. Payroll departments are human, and HMRC systems can glitch. If your net pay looks lower than expected, follow these steps:
- Check your Tax Code: Is it 1257L? If it is something like ‘BR’ (Basic Rate) or ‘0T’, you are likely being overtaxed. Call HMRC immediately to rectify this.
- Check your hours: If you are paid hourly, ensure your logged hours match the payslip.
- Speak to Payroll: Your company’s payroll or HR department is there to help. Send a polite email querying the discrepancy.
Summary
Your payslip is more than just a receipt for your salary. It is a record of your contributions to society and your investment in your own future via pensions and loan repayments. By understanding each section, you ensure you are treated fairly and can budget with confidence for your life as a young professional.
Frequently asked questions
What does each section of a UK payslip mean?
Gross pay is what you earn before deductions. Then you see income tax, National Insurance, pension and student loan deductions. Net pay is what lands in your bank. Year to date (YTD) totals show what has been deducted across the tax year so far (April to April).
What is a tax code and how do I check mine is right?
Your tax code tells your employer how much tax-free pay you get. The standard code for one job is 1257L (12,570 personal allowance). Common wrong codes are BR (no allowance, all 20 percent), 0T (no allowance) or week 1/month 1 codes. Check yours on the HMRC app or call 0300 200 3300 to fix it.
What does an emergency tax code look like?
Codes ending in W1, M1 or X mean you are on emergency tax. This usually corrects itself within a few months but you can speed it up by sending HMRC your P45 or new starter checklist. Overpaid tax is refunded automatically through your next payslip.
Why does my net pay change month to month if my salary is fixed?
Common reasons are tax code changes, student loan crossing the threshold for the first time, pension contribution changes, bonus payments or salary sacrifice schemes starting. Always compare gross pay across months first to spot whether the change is at the income or deduction stage.
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