Opening your first payslip can be genuinely confusing. There’s a mix of numbers, codes, and abbreviations that nobody really explains before you start working, and it’s easy to just glance at the take-home figure at the bottom without understanding how it was actually calculated.
That’s a shame, because your payslip is one of the easiest places to catch a genuine mistake, and mistakes on payslips happen more often than people expect.
This guide breaks down every section you’ll typically find on a UK payslip, what it means, and how to check whether the numbers actually add up correctly.
What Every UK Payslip Has to Include
Whatever your employer’s specific payslip format looks like, UK law requires every payslip to include certain core information under the Employment Rights Act 1996, a requirement that also covers agency workers and people on zero hours contracts.
At minimum, you should see:
- Your gross pay, meaning your total earnings before any deductions
- A breakdown of each individual deduction, shown separately rather than lumped together
- Your net pay, meaning what actually lands in your bank account
- Your tax code
If your employer isn’t providing this level of detail, or isn’t giving you a payslip at all, you’re entitled to raise it, either directly with them or through ACAS if it isn’t resolved.
Gross Pay: Where Everything Starts
Gross pay is your total earnings for the pay period before anything is taken off. This is the figure in your employment contract, and every other calculation on your payslip works from this number.
Some payslips separate out “total gross pay” from “total subject to tax,” and if you see both, the difference is usually down to salary sacrifice arrangements, such as pension contributions or a cycle to work scheme, which reduce the amount of your pay that’s actually taxed. This is a normal and often beneficial arrangement, not an error, since it typically means you pay less tax and National Insurance overall.
Your Tax Code
Your tax code is one of the most important things on your payslip, since it determines how much of your income is treated as tax-free before Income Tax is calculated.
The standard tax code for most people with one job and no unusual circumstances is 1257L. Here’s how to read it:
- The number, 1257, represents your annual tax-free Personal Allowance when multiplied by 10, giving £12,570, which is the standard tax-free amount most people can earn before paying Income Tax
- The letter L simply confirms you’re receiving the standard allowance with no unusual adjustments
A few other codes you might see, and what they mean:
- A code starting with S, such as S1257L, means you’re classed as a Scottish taxpayer, which uses Scotland’s own income tax rates and bands rather than the rates used in England and Northern Ireland. Your Personal Allowance stays the same, but the tax bands above it differ.
- A code starting with C, such as C1257L, means you’re classed as a Welsh taxpayer, following a similar principle.
- A code starting with K means you have untaxed income that’s actually higher than your allowance, which can happen for reasons like recovering tax owed on savings interest or certain benefits, and results in extra tax being deducted rather than an allowance being given.
- BR, 0T, or a code ending in W1, M1, or X usually indicates an emergency tax code. These typically apply when your employer doesn’t yet have your full tax history, often because you’re starting a new job without a P45 from your previous employer, and can result in you being taxed more than you should be, at least temporarily.
If you’re on an emergency code, the fix is usually straightforward: give your new employer a P45 from your previous job if you have one, or complete HMRC’s starter checklist if you don’t. Once your correct tax code comes through, any overpaid tax is generally refunded automatically through your pay, though it can take a pay cycle or two for the correction to come through.
Income Tax (PAYE)
PAYE stands for Pay As You Earn, and it’s the system through which your employer deducts Income Tax directly from your salary before you ever see it, based on your tax code.
Importantly, PAYE is calculated cumulatively across the tax year, not simply based on that single month’s pay in isolation. This means your monthly tax deduction can genuinely vary if your earnings fluctuate month to month, for example if you receive a bonus or work extra hours in a particular period, since the system is constantly recalculating what you should have paid based on your total earnings so far in the tax year.
National Insurance
National Insurance is a separate deduction from Income Tax, and it funds things like your State Pension, the NHS, and certain benefits such as Statutory Sick Pay and Maternity Pay.
Unlike Income Tax, National Insurance is calculated per pay period rather than cumulatively across the year, using its own separate threshold. You’ll typically see a National Insurance category letter on your payslip too, most commonly Category A for standard employees. If this letter looks unusual for your situation, it’s worth double checking with your employer, since an incorrect category can mean an incorrect deduction rate being applied every single month.
You might also see a line for “Employer NI” or “ER NIC” on some payslips. This doesn’t come out of your pay at all. It’s a separate cost your employer pays on top of your salary, shown for transparency but not something that affects your take-home pay.
Pension Contributions
If you’re enrolled in a workplace pension, which most employees in the UK are automatically enrolled into under auto-enrolment rules, you’ll see a pension deduction on your payslip. The minimum combined contribution is typically 8 percent of qualifying earnings, made up of at least 5 percent from you and at least 3 percent from your employer.
Many workplace pensions now use salary sacrifice, where your pension contribution is deducted before tax and National Insurance are calculated, rather than after. This arrangement usually works in your favour, since it reduces the amount of your pay that’s subject to tax and National Insurance in the first place, effectively making your contribution slightly cheaper than it would be otherwise.
Student Loan Deductions
If you have a student loan, repayments are usually deducted automatically through your payslip once your earnings go above your specific plan’s threshold. The deduction is calculated as a percentage, commonly 9 percent, of your earnings above that threshold, not on your full salary.
There are different loan plans, commonly referred to as Plan 1, Plan 2, Plan 4, and Plan 5 depending on when and where you studied, and each has a different earnings threshold before repayments start. If you’re not sure which plan you’re on, it’s worth checking, since being on the wrong plan on your payslip means either overpaying or underpaying compared to what you should actually be repaying.
Doing the Maths Yourself
A simple way to check your payslip is correct is to add up every individual deduction line and subtract the total from your gross pay. The result should match your net pay exactly.
In simple terms: gross pay, minus Income Tax, minus National Insurance, minus pension contributions, minus student loan deductions, minus any other deductions, should equal your net pay. If the numbers don’t quite add up when you do this yourself, that’s a sign something on the payslip needs a closer look, rather than something to just accept and move on from.
Common Errors Worth Checking For
A tax code that doesn’t match what you expect. If your circumstances are simple, one job, no additional benefits or untaxed income, and your code isn’t the standard 1257L or its regional equivalent, it’s worth understanding why, either by checking your HMRC online account or contacting HMRC directly.
Being on an emergency tax code longer than expected. This should typically resolve itself within a pay cycle or two once your employer has your full details, so if it’s persisting for months, it’s worth chasing up directly.
The wrong National Insurance category. This is less common but does happen, particularly for people in slightly unusual employment situations, and it directly affects how much is deducted each period.
Student loan deductions when you don’t have a student loan, or being on the wrong plan. This can happen due to a simple data entry error when you started the job, and is worth correcting quickly since it affects your take-home pay directly.
Pension contributions that don’t match your expected rate. If you know your contribution rate and the deduction on your payslip doesn’t match it, this is worth raising with your payroll department, since even a small percentage error compounds meaningfully over a full year.
What to Do If Something Looks Wrong
If you spot a discrepancy, the first step is usually to raise it directly with your employer’s payroll or HR department, since most payslip errors are genuine mistakes rather than anything deliberate, and they’re usually straightforward to correct once flagged. Keep copies of your payslips as you go, since having a clear record makes it much easier to demonstrate exactly when an issue started if it takes more than one conversation to resolve.
If the issue specifically relates to your tax code rather than something your employer controls directly, you may need to contact HMRC as well, since tax codes are ultimately set by HMRC and simply applied by your employer’s payroll system.
A Worked Example, Start to Finish
To bring everything together, here’s how a typical monthly payslip breaks down in practice for someone earning a standard salary in England, with a workplace pension and no student loan.
Say your gross monthly pay is £3,000. Working through each deduction in order:
- Your tax code allows a portion of your income to be tax-free each month, based on your annual Personal Allowance divided across the year
- Income Tax is then calculated on the remaining taxable portion, using the current tax bands
- National Insurance is calculated separately, using its own monthly threshold, on earnings above that threshold
- Your pension contribution, commonly a percentage of qualifying earnings, is deducted, often before tax is calculated if your scheme uses salary sacrifice
Once all of these are subtracted from your £3,000 gross pay, what remains is your net pay, the actual amount that lands in your bank account. Because tax codes, pension rates, and personal circumstances vary so much between individuals, it’s genuinely useful to run your own numbers through a free UK take-home pay calculator using your actual salary and tax code, rather than relying on a generic example, since even small differences in circumstances can meaningfully change the final figure.
Payslip Frequency and What It Means for Your Numbers
Not everyone is paid monthly. Depending on your employer, you might be paid weekly, fortnightly, or four-weekly instead, and this affects how your tax-free allowance and thresholds are applied for each pay period. A monthly-paid employee gets roughly one twelfth of their annual allowance applied each pay period, while a weekly-paid employee gets roughly one fifty-second. If you switch from one pay frequency to another partway through a job, or start a new job partway through a month, you may see a slightly unusual figure in that first affected pay period as the system adjusts, which is normal rather than necessarily an error.
Frequently Asked Questions
Why did my take-home pay change even though my salary didn’t? This can happen for several reasons: a change in your tax code, a pension contribution rate adjustment, a change in student loan plan, or simply the cumulative nature of PAYE catching up after an unusual previous month. Comparing your current payslip against your last few, rather than just the most recent one, often makes the cause clearer.
What does “Total subject to tax” mean if it’s different from my gross pay? This usually reflects salary sacrifice deductions, such as pension contributions or a cycle to work scheme, being taken off before tax is calculated. Your headline gross pay and your taxable gross pay can legitimately differ for this reason.
How do I check my tax code is actually correct? You can check your tax code through your personal tax account on the HMRC website or app, which shows the reasoning behind your current code. If it doesn’t match what you’d expect based on your circumstances, contacting HMRC directly is the right next step.
My employer isn’t giving me a payslip at all. Is that legal? No. UK employers are legally required to provide a written payslip on or before your pay date, covering employees, agency workers, and those on zero hours contracts alike. If this isn’t happening, you can raise it with ACAS or, if unresolved, pursue it through an employment tribunal.
What should I do if I think I’ve been underpaid or overpaid tax over several months? Contact HMRC directly, since they can review your tax record across the relevant period and correct it. Overpaid tax is typically refunded, either automatically through your pay or as a direct repayment, once the correction is confirmed.