Few bits of personal finance are as widely misunderstood as the student loan. People treat it like a credit card hanging over them and rush to clear it — often a mistake. For most graduates, a student loan behaves less like a debt and more like a graduate tax.
Why it is not normal debt
You only repay once you earn above a set threshold, and the amount is a fixed percentage of income above that line — not a fixed monthly bill. If your income falls, repayments fall too. If you stop working, they stop. And after a set number of years, any remaining balance is simply written off, whatever is left.
The key question
That write-off is everything. A large number of graduates will never repay the full amount before it is wiped. For them, voluntarily overpaying is money thrown away — they are clearing a debt that would have vanished anyway. The repayment comes out whether or not the balance ever reaches zero.
When overpaying might make sense
- You are a high earner on track to clear the whole loan well before the write-off date.
- The interest is genuinely outpacing what you could earn or save elsewhere, for your specific plan type.
Even then, the maths is finely balanced and depends heavily on your future earnings, which nobody can be sure of.
The sensible default
For most graduates, the spare money is far better directed at expensive debt, an emergency fund, a pension, or a house deposit than at a loan that may never be fully repaid. Check which repayment plan you are on, look at the write-off date, and be honest about your likely earnings before overpaying a penny.