Published: June 2026 | Fact-Checked & Audited By: David Vance, CTA FCA (Chartered Tax Advisor & Accountant)
This guide is fully updated for the 2026/27 HMRC tax year. All calculations and tax rules have been audited against official UK legislation.
Receiving your monthly payslip is a routine event, but understanding all the codes and figures on it can be challenging. Between tax codes, National Insurance categories, and pension schemes, it is easy to lose track of how your net pay is calculated. In this guide, we decode the key fields on a standard UK payslip to help you ensure you are being paid correctly.
Key Payslip Fields Explained
While layouts vary by employer, all UK payslips contain the same essential information. Here is what the key terms mean:
- Tax Code: This code (e.g., 1257L) tells your employer how much tax-free income you are entitled to in the tax year. The numbers represent the allowance (1257 means £12,570), and the letter indicates your status (L is the standard single allowance).
- NI Category Letter: This letter indicates which National Insurance rates apply to you. Most standard employees are in Category A. Apprentices under 25 are Category H, and employees over State Pension age are Category C.
- Gross Pay: Your total earnings during the pay period before any taxes, pensions, or student loans are deducted.
- Taxable Pay (or taxable gross): Your gross pay minus any pre-tax deductions like salary sacrifice pension contributions. This is the figure your income tax calculation is based on.
- Net Pay: The final “take-home” amount that is transferred directly to your bank account after all deductions.
Common Payslip Deductions
Your deductions are generally split into statutory deductions (mandated by law) and voluntary deductions (selected by you):
| Deduction Type | Statutory / Voluntary | How it is calculated |
|---|---|---|
| PAYE Tax | Statutory | Based on your tax code and marginal income tax bands. |
| National Insurance | Statutory | Calculated on earnings above the Primary Threshold (£1,047/month). |
| Workplace Pension | Voluntary/Auto-enrol | Usually a percentage of qualifying earnings (typically 5%). |
| Student Loan | Statutory | 9% of earnings above your plan’s weekly or monthly threshold. |
To verify that your payroll department has calculated your deductions and net pay correctly, run your figures through our Payslip Estimator Calculator.
Understanding Your Tax Code Coding Notice
If you see a “W1” or “M1” at the end of your tax code (e.g., 1257L W1), you are on an emergency tax code. This means your tax is calculated only on the earnings in that specific pay period, ignoring what you earned earlier in the tax year. This frequently happens when starting a new job before your P45 is processed. Standard tax codes are cumulative, meaning they adjust dynamically to ensure your allowances are spread evenly across the tax year.
Frequently Asked Questions (FAQ)
Q: What does the NI letter on my payslip mean?
Q: What is a W1 or M1 indicator next to my tax code?
A: This means you are on a non-cumulative “week 1” or “month 1” basis, taxing each payslip in isolation. This often happens after a job change.