Overpaying doesn't reduce what you pay each month
You're thirtyish and you've got a bit of spare money.
It only benefits you if you'll earn enough to clear the loan before it's written off.
Your monthly deduction will not move
Not next month, not ever.
What comes off your pay is 9% of everything you earn above the threshold. Your balance isn't part of that sum — it never has been. Pay in £5,000 tomorrow and next month's payslip looks exactly like last month's.
One exception, and it's the whole of this page: clear the loan outright and the deduction stops for good. Your interest rate doesn't move either — on Plan 2 that's set by what you earn, not what you owe.
You cannot have it back
GOV.UK, on their own page about this:
"You cannot get a refund of any extra repayments you make."
One-way. No account to draw it back out of, no changing your mind in three years when the boiler goes.
Don't confuse this with the refunds that do exist — if your employer deducted while you earned under the threshold, that money is yours to claim. That's a mistake being corrected. An overpayment isn't a mistake, so there's nothing to correct.
If you'll never clear it, you're buying down a debt that was going to be cancelled anyway
Same total repaid. To the penny.
A borrower on Plan 2 who started repaying in 2019, earns £35,000 and owes £45,000. They pay £42.11 a month and will not clear this loan.
| They pay in | They repay over the life of the loan | Cancelled at the end |
|---|---|---|
| £0 | £40,946.70 | £68,206.02 |
| £1,000 | £40,946.70 | £65,165.79 |
| £5,000 | £40,946.70 | £53,004.89 |
| £20,000 | £40,946.70 | £7,401.50 |
Read the middle column again. It doesn't change. Not by a pound, not by a penny. All the overpayment does is shrink the right-hand column — with money they can't get back.
Show me the arithmetic — and the point where it finally does something
£35,000 − £29,385 = £5,615 above the threshold
£5,615 × 9% = £505.35 a year, or £42.11 a monthThat depends on the salary and nothing else. Change the balance from £45,000 to £25,000 and it is still £505.35 a year. Over the remaining years to write-off those deductions total £40,946.70 — and since every one is set by salary, the total is the same whatever the balance started at.
Interest starts at about 3.7% for this borrower and climbs towards 5% as their salary does — either way it is more than the £505 a year they repay, so the balance rises every year regardless.
There is a crossover, and it is a long way up. Overpay enough and the balance eventually drops far enough that £505 a year outruns the interest. For this borrower that point is £22,435 — just under half the balance, handed over in one go. And at the crossover the payoff is not a payoff: at £22,434 the lifetime total is unchanged to the penny, and one pound more moves it from £40,946.70 to £40,945.25. A saving of £1.45 for £22,435.
So it isn't a dial where a bit of money buys a bit of benefit. For a long stretch it buys nothing, then almost nothing, and only well past the crossover does it start to matter.
If you will clear it, the sums reverse completely
£5,000 in, about £6,000 less out, and finished nearly two years sooner.
A different borrower. Also Plan 2, also 2019, but earning £60,000 and owing £20,000. They pay £229.61 a month and clear this loan in March 2033. For them every pound overpaid stops accruing interest and brings the finish line forward.
| They pay in | They finish | They repay in total | In today's money |
|---|---|---|---|
| £0 | March 2033 | £24,730.32 | £22,232.99 |
| £1,000 | November 2032 | £23,253.07 | £21,014.67 |
| £5,000 | August 2031 | £17,620.49 | £16,258.39 |
| £10,000 | January 2030 | £11,157.50 | £10,565.37 |
Why I'd rather you looked at the last column
£5,000 in saves £7,109.83 off their payslips — but that's a cash figure, and cash figures flatter this comparison. £5,000 handed over today is being set against money that would have left their pay slowly between now and 2033, and money in 2033 is worth less than money today.
Adjusted for that, £5,000 today saves them £5,974.60 in today's money. So the honest number is a gain of about £975, not £2,110.
Still a gain — roughly a fifth of the money back over seven years, plus being finished in 2031 instead of 2033. I'd rather show you the smaller true number than the bigger flattering one.
Pays in £5,000
- Salary £35,000
- Owes £45,000
- Will never clear it
Pays in £5,000
- Salary £60,000
- Owes £20,000
- Will clear it
The same £5,000. One of them is buying something; the other is buying nothing.
If you do pay in, say where it should go
Two loans and no instruction means the Student Loans Company chooses for you.
Plenty of people here hold an undergraduate and a postgraduate loan at once — separate thresholds, separate interest, separate write-off dates. A payment aimed at the wrong one is worth less, and you can specify which.
No penalty, and no minimum. The only irreversible thing is the money.
Where this argument breaks down
Three places, and I'd rather tell you than have you find them.
These are two example borrowers, not you — and nobody knows their own future earnings, including you. All of this rests on whether you'll clear the loan: a question about the next thirty years. Someone who looks like they never will can be promoted twice.
The terms change. The Plan 2 threshold is due to be frozen from April 2027 to April 2030, pulling more people towards clearing it. Announced policy, not enacted law, in August 2026.
I'm not comparing this against anything else you could do with the money. The honest limit of this page. GOV.UK points people to a financial adviser at exactly this question, which tells you how personal it is.
At length: assumptions and limitations.
So the only question that matters is the first one
Will you clear this loan before it's written off?
If yes, overpaying does something real, and the earlier the more. If no, it does nothing — not a smaller payment, not an earlier finish, not a lower rate. It reduces a number that was going to be deleted.
The calculator above tells you which. It doesn't model overpayments, and I'd rather say so than imply otherwise.
I can't tell you what to do about your own loan. This is information rather than advice.
2026/27 tax year. Examples: Plan 2, repayment from 2019, born 1996, RPI 3%. Full workings.