STUDENTJOB BLOG

Your first payslip from a part-time or holiday job arrives, and the tax deduction looks bigger than you expected. Among the details on your payslip, you spot a code such as 1257L W1 or 1257L M1. It can be unsettling when you have only just started earning. Often, though, it means payroll is using a temporary way of calculating Income Tax while HMRC gets the information it needs. Here is how to check the code, put your details right and find out whether you have overpaid.

Why your first payslip might show an emergency tax code

The letters at the end of the code matter. W1 means week one, M1 means month one, and X is another marker for an emergency code. You may also see NONCUM on a payslip. These tell payroll to calculate tax using that pay period on its own, rather than looking at your pay and tax across the year so far. The code 1257L, without W1, M1 or X, does not by itself mean you are on an emergency code.

Taxpro’s guide to an emergency tax code explains why those extra letters can affect what comes out of a payslip. Imagine earning more during a busy holiday month than you usually earn during term time. A non-cumulative calculation treats that month separately and may take more tax than a calculation based on your earnings across the year would. Equally, an emergency code does not mean everyone has overpaid. The result depends on your earnings, previous pay and other circumstances.

As HMRC’s emergency tax guidance explains, the code is generally temporary. It is worth checking rather than ignoring, especially if you expect your hours to change during the year.

Why new starters often end up on the wrong code

When you change jobs, your new employer needs information about earlier pay and tax to run PAYE accurately. A P45 from your previous employer provides those details. If you have never worked before, you will not have a P45. The same may be true when you start a new job before receiving one from an old employer. In those cases, your employer uses the information you provide on a starter checklist. If that information is missing or incomplete when payroll is set up, an emergency code may appear on your first payslip.

The checklist also asks about other jobs and certain other sources of income. Answering it accurately matters whether you are starting your first Saturday shift or taking a second job alongside one you already have. Do not assume that being a student automatically means you should pay no Income Tax. Under current guidance, the standard Personal Allowance is £12,570, but the tax taken from an individual payslip depends on your code and circumstances. If your earnings vary between term time and holidays, a deduction on one payslip may not reflect what you owe across the whole tax year.

There is an important difference between a code being temporary and a code being correct for you. Checking the details you gave your employer is the first step towards finding out which applies.

What to do before and after your first payday

If you have a P45, give it to your new employer when you start. If you do not, complete the PAYE starter checklist and give the information to your employer before your first payday. If this really is your first job, say so on the checklist rather than trying to find a P45 that does not exist. Check your answers about any other work before handing it in, since they help your employer choose how to set up your tax record.

Already been paid? Look at the code printed on your payslip and check whether your employer has received the right starter details. You can then use HMRC’s Check your Income Tax online service to review your employment information and update anything that is wrong. You can contact HMRC if you cannot sort it out online. GOV.UK directs workers who have received their first pay to that HMRC route, rather than treating the starter checklist as the way to correct a code after payday.

A correction may not appear immediately. HMRC says it will usually update a new starter’s tax code when it has the details it needs from the new and previous employers, and that this can take up to 35 days from the job’s start date. That is guidance about updating the code, not a promise that a refund will arrive within 35 days. Meanwhile, keep checking your payslips so you can see whether the suffix disappears or your tax deduction changes. If you are getting used to your first wage statement, StudentJob’s salary and tax advice can help you make sense of the wider pay picture.

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How overpaid tax usually comes back

If your code is corrected during the same tax year, you may not need to submit a separate refund claim. Once your employer receives and uses a normal cumulative code, payroll can recalculate the tax due on your pay so far that year. If too much has been deducted, the adjustment will usually show through your pay. Check the tax line on your next payslip as well as the amount that reaches your bank account. The change may be less obvious than a payment labelled “refund”.

What happens if the job ends before the code changes, or you notice the deduction after the tax year has finished? HMRC may reconcile your record and tell you about overpaid tax through a tax calculation, often called a P800. You can also check your position and claim directly through HMRC where appropriate. Keep your final payslip, any P45 you receive when leaving and your P60 if you are still employed at the end of the tax year. These records help you compare what you earned with what was deducted.

Do not calculate a refund from one surprising payslip alone. Another job, changes in hours or tax already paid elsewhere can affect the final position. If HMRC asks you to confirm how a refund should be paid, follow its instructions through an official HMRC channel. The useful question is whether the tax on your full record was too high, not simply whether one deduction felt high at the time.

A quick payslip check now can save hassle later

For your next payday, start with the tax code rather than the take-home figure. Is it 1257L on its own, or does it still have W1, M1 or X attached? Then compare the employment details held by HMRC with the jobs you actually have. If the code looks wrong, speak to payroll about the information they used and check your details with HMRC. Keep copies of your payslips while the issue is being resolved, particularly if you work irregular shifts or change jobs between terms.

You can deal with an overpayment through HMRC yourself. If you would rather have help with a PAYE tax refund claim, an HMRC-registered tax agent such as Taxpro can assist with claiming back overpaid tax. Either way, the most useful habit is simple: check your first few payslips instead of assuming an unfamiliar code will fix itself. A temporary code need not become a lasting headache, but spotting it early gives you the chance to put the right details in place.