Going back to university as a mature student is a bold career move. Whether you're retraining for a new field, pursuing a professional qualification, or simply following a passion, the financial implications extend far beyond tuition fees. This guide covers the tax position, student loan mechanics, and the true cost of the income you give up.
The real cost: lost income
The biggest cost of returning to education isn't tuition — it's the salary you forgo. If you're earning £40,000 and take three years out for a degree, the gross cost is £120,000 in lost earnings. After tax, that's approximately £93,000 in lost take-home pay (using 2026/27 rates). Plus three years of missed pension contributions (£2,000/year employee + £1,200 employer match = £9,600, which compounds to significantly more by retirement).
Part-time study while working reduces this cost but extends the timeline. Many mature students find a middle path: reducing to part-time employment (e.g., three days/week) while studying, keeping some income flowing and maintaining pension contributions.
Tuition fees and the new student loan
Full-time UK undergraduate fees are capped at £9,535/year for 2026/27. A three-year degree costs £28,605 in fees. You'll take out a Plan 5 student loan (for courses starting from 2023/24 onwards) which has the following terms:
- Repayment threshold: £25,000/year
- Repayment rate: 9% of income above the threshold
- Interest rate: RPI only (no real-terms growth of the debt)
- Write-off: 40 years from graduation
On a £40,000 post-graduation salary, you'd repay £1,350/year (9% × £15,000). At that rate, the full loan (tuition + maintenance) would take over 30 years to clear. For many mature students, the loan effectively functions as a graduate tax of 9% on income above £25,000 for most of their remaining career.
What about existing student loans?
If you already have a Plan 1 or Plan 2 loan from a previous degree, it continues to accrue interest while you study (unless your income is below the threshold). Repayments are paused only if your income drops below the relevant threshold — which it likely will if you stop working.
Taking a new loan for a second undergraduate degree is not always possible — funding rules vary. Postgraduate loans (up to £12,167 for a Master's) are separate and repaid at 6% above £21,000. You could end up repaying two loans simultaneously post-graduation: 9% + 6% = 15% of income above the respective thresholds.
Tax on part-time work while studying
If you work part-time during your studies, you're taxed normally. The good news: if you earn below £12,570/year (roughly £240/week), you pay no income tax at all. Between £12,570 and £50,270, you pay 20% income tax plus 8% NI — but on a low part-time income, your effective rate is very low.
Make sure your employer has the correct tax code. If you have multiple part-time jobs, only one can use your Personal Allowance. The others should be on a BR (basic rate) code. HMRC will reconcile at year-end, but getting the code right upfront avoids unexpected bills.
Bursaries, grants, and scholarships
Good news: most student bursaries, grants, and scholarships are tax-free. This includes maintenance grants, university bursaries, hardship funds, and most research council stipends. They don't count as taxable income and don't need to be declared on a tax return.
Exceptions: if a “scholarship” is really payment for work (e.g., a sponsored degree where you work for the company during holidays), HMRC may treat it as employment income. The test is whether the payment is conditional on performing services.
The pension gap
Three years with no pension contributions is significant. At age 35, missing £3,200/year in combined pension contributions (employer + employee) for three years means losing £9,600 of inputs — which at 5% annual growth would be worth approximately £38,000 by age 65. At age 45, the same gap compounds to roughly £25,000.
If you can afford it, consider making voluntary pension contributions during your studies. You get tax relief on contributions up to £3,600/year gross (£2,880 net) even with no earnings — the government automatically adds 20% basic rate relief. This keeps your pension growing and partially offsets the gap.
The break-even calculation
The question every career changer asks: when do I earn back the investment? Consider a 35-year-old leaving a £40,000 job to retrain as a teacher (starting salary ~£31,650, rising to £43,000+ within five years):
- Lost income over 3 years: ~£93,000 take-home
- Student loan: ~£45,000 (tuition + maintenance)
- Repaid at 9% above £25,000 over career
- New career earning potential: £31,650 → £43,000 by year 5
- Break-even (recovering lost income): approximately 8–10 years post-graduation if the new career pays similarly or more
If the career change leads to higher lifetime earnings, the investment pays off. If it leads to similar or lower earnings, the financial case is weaker — but job satisfaction, work-life balance, and personal fulfilment are not captured in a spreadsheet.
State Pension protection
While studying full-time with no income, you won't be paying National Insurance. This could create a gap in your NI record. You can fill gaps with voluntary Class 3 contributions (£17.45/week). However, if you receive Universal Credit or certain other benefits while studying, you may receive NI credits automatically. Check your NI record online to identify any gaps.
Model your scenarios
Use the income tax calculator to compare your current take-home with your expected post-qualification salary. Our student loan repayments guide explains how Plan 5 repayments work, and the early repayment guide helps you decide whether to clear the debt faster post-graduation.