Starting a part-time job is a milestone many students look forward to, but the world of PAYE, tax codes, and Personal Allowances can be confusing if nobody’s explained it before. Here’s what you actually need to know.
First, the good news: students are not exempt from income tax, but most working part-time won’t actually pay any. Everyone in the UK gets a tax-free Personal Allowance — for the 2026-27 tax year, this is £12,570, or £242 a week. If your earnings stay below that threshold across the whole tax year (which runs from April to April), you shouldn’t pay a penny in income tax. National Insurance works slightly differently, with its own weekly threshold, but the same general principle applies: earn under the limit, and you won’t be taxed on it.
Where things get messy is the tax code. When you start a new job, your employer needs to know your correct tax code to deduct the right amount through PAYE (Pay As You Earn). If you don’t hand over a P45 from a previous employer, or you’re starting your first-ever job, you may be placed on an “emergency” tax code. This can mean tax is deducted as if you’ll earn that income every week or month for the rest of the year — even if you’re only working over the summer or during term-time. The result: you often pay far more tax than you should.
This is especially common for students who work irregular hours. If you pick up extra shifts over the Christmas period, for instance, HMRC’s system might assume you’re earning at that rate all year, pushing you above the Personal Allowance temporarily and triggering deductions that don’t reflect your actual annual income.
The good news is that this overpayment isn’t lost. At the end of the tax year, HMRC typically sends an automatic P800 tax calculation and reimburses any tax you’ve overpaid — so in many cases you don’t need to do anything. But if you don’t want to wait, or you spot an error in your P800, you can proactively claim a refund using a P50 form at any point.
A few practical tips: always complete a “New Starter Checklist” when beginning a job if you don’t have a P45, keep hold of your P45 when leaving a job (your new employer will need it), and check your payslips regularly to make sure the tax code looks right. If you’re self-employed — tutoring, freelancing, content creation — the rules differ, and you’ll likely need to register for Self Assessment and file your own return.
Understanding this system early saves you money and stress. Many students go through their entire degree overpaying tax without realising it, simply because nobody explained how the Personal Allowance and tax codes actually work. A few minutes checking your payslip could put money back in your pocket.
