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Graduates earning middle incomes can end up paying the most in cash terms for their student loans, according to new analysis by Rathbones, one of the UK’s leading wealth and asset management firms.
As families await university offer decisions ahead of the mid-May deadline, the analysis identifies a ‘student loan danger zone’ for graduate earnings. Those starting their careers on salaries of roughly £45,000 to £50,000 can end up repaying more than anyone else - simply because they remain in the system the longest and pay the most interest.
Under current Plan 2 rules, for which interest rates have been capped at 6% for the next academic year, a graduate starting on around £47,000 with a £50,000 student loan can repay £136,000 over 30 years - nearly three times the amount borrowed and the worst possible outcome under the system.
This happens because earnings at this level are just high enough to avoid a meaningful write off, but not high enough to clear the loan quickly, allowing interest to build up for decades.
The analysis is based on a £50,000 Plan 2 loan, with annual pay growth of 4% (reflecting inflation linked increases and bonuses), RPI inflation (linked to Plan 2 loans) of 3%, current student loan interest rules, and a full write off after 30 years*.
Ed Wood, Financial Planning Director at Rathbones, says: “Many people assume the highest earners are worst hit by student loans, but the reality is more complex. Middle earners can end up paying the most simply because they’re trapped repaying for longer, allowing interest to build up year after year.”
Graduates starting on £40,000 fare little better. They repay just over £100,000 in total - more than double the original loan - yet still fail to clear the balance before it is written off, leaving them stuck repaying for the full 30-year term.
Higher earners can end up paying less overall. A graduate starting on around £63,000 repays roughly £90,000 in total, as earnings are sufficient to cover interest from day one, preventing the debt from growing and allowing it to be cleared far sooner - despite the maximum interest rate applying.
At the lower end of the pay scale, graduates starting on £30,000 repay around £50,000 over 30 years. While the outstanding balance can grow to more than £110,000 on paper, much of it is eventually wiped, and repayments remain relatively modest throughout.
“The headline debt figure can look frightening, especially for lower earners, but what really matters for most people is the monthly repayment, not the balance,” Ed Wood adds. “In that sense, student loans behave far more like a graduate tax than a conventional debt. But as earnings rise over time, the maths shifts — and paying the loan off can start to make sense.”
Parents and grandparents facing tough choices
Concerns about student debt are also weighing heavily on parents and grandparents, particularly amid rising living costs, high housing prices and childcare expenses.
Ed Wood, says: “From experience with clients, many parents and grandparents have high expectations for their children or grandchildren and assume they’ll go on to earn strong salaries. As a result, they often plan to pay university fees upfront to spare them the burden of student debt. For those who can afford it, this can be a sensible approach.
“Grandparents may also see a double benefit: helping with fees now while potentially reducing a future inheritance tax bill. However, there’s no one‑size‑fits‑all answer. The key is understanding how student loans actually work before making any irreversible decisions.”
When does it make sense to overpay?
Whether or not to overpay depends heavily on career trajectory. Ed Wood highlights three key rules of thumb:
- Don’t panic about the balance - monthly repayments matter far more.
- Middle earners often pay the most because they stay in the system longest.
- Overpaying tends to be most relevant for those who go on to become higher-rate tax payers for much of their career.
