Should I overpay my student loan? The short version
There’s a lot of confident advice online telling everyone with a student loan to either “never overpay it, it’s basically free money” or “always clear it as fast as you can.” Neither is right for everyone, because it depends on a question specific to you: will this loan be cleared by your normal repayments before it gets written off, or not?
Question one: are you on track to clear it anyway?
Compare two things:
- How many years are left until your plan’s write-off date (see when does my student loan get written off?).
- Roughly how many years your current repayments, at your income and its likely growth, would take to clear the balance.
If the write-off date arrives first, the loan was never going to be fully repaid through your normal repayments — interest and all. Extra repayments in that situation mostly transfer money to the government early that would otherwise have been cancelled for free. Overpaying makes the loan disappear from your life sooner psychologically, but it doesn’t save you the interest, because that balance was going to be wiped either way.
If you’re on track to clear it before the write-off date, the interest charged in the meantime is a real cost you’ll actually pay in full. Reducing the balance sooner genuinely reduces how much interest accrues.
Question two: if it’s a real cost, does overpaying beat investing?
If you’re in the second group, overpaying isn’t automatically the better move either. It’s competing with the alternative of putting the same money into an investment instead:
- Overpaying guarantees a return equal to your loan’s interest rate — a known, fixed, tax-free “return” because it directly cuts what accrues.
- Investing offers no guarantee. Over long periods diversified investments have often earned more than student loan interest rates, but not in every period, and you can lose money.
There’s no single right answer here — it depends on your own risk tolerance, timeframe, and whether you’d actually invest the difference rather than spend it. See how student loan interest works for how the interest itself is calculated.
Why this needs your own numbers
Both questions depend heavily on your balance, your plan, your salary today and how it’s likely to grow, and how many years you have left before write-off. Two people on the same plan with different salary trajectories can land on opposite answers. That’s what the calculator on this site is for: enter your own figures, and it runs both scenarios — minimum payments only, and with your overpayment — year by year, and shows which one comes out ahead on the numbers you gave it.
This is general information, not a personal recommendation. Before making a large one-off overpayment, it’s worth getting independent financial advice — see the full disclaimer for what this site’s modelling does and doesn’t cover.