Student Loan Repayment: Should You Pay It Off Early?

I didn’t go to university. By the time I was 18, I was already working and earning, which turned out to be one of the luckiest financial breaks of my life. But I have spent years talking to people who did go, many of whom carry student loan balances of £30,000 to £60,000 and wonder whether they should try to clear it faster.

The answer, for most people, is no. And the reason is that UK student loans are genuinely one of the most misunderstood financial products in the country. They look like a loan. They feel like a loan. But they behave much more like a tax. And once you understand that, the decision becomes clear.

The different plans

Not all student loans are created equal. When you started university determines which plan you are on, and the terms are significantly different.

Plan	Who	Repayment threshold	Rate	Written off
Plan 1	Started before Sept 2012 (England/Wales) or any NI/Scotland	£24,990/year	Lower of RPI or base rate +1%	25 years after first due, or age 65
Plan 2	Started Sept 2012 onwards (England/Wales)	£27,295/year	RPI + up to 3%	30 years after graduation
Plan 4	Scotland (post-1998)	£31,395/year	Lower of RPI or base rate +1%	30 years after graduation
Plan 5	Started Sept 2023 onwards (England)	£25,000/year	RPI only	40 years after graduation

The repayment rate is 9% of everything you earn above the threshold for all plans. So if you are on Plan 2 and earn £37,295, you repay 9% of £10,000, which is £900 per year or £75 per month. It comes straight out of your pay, just like tax.

The write-off is the key

Here is the most important thing to understand: the balance gets written off after a set period, regardless of how much is left. For Plan 2, that is 30 years after you graduate. For Plan 5, it is 40 years.

This changes everything. Because if you are never going to fully repay the loan within that period (and the majority of graduates won’t), then any extra money you throw at it is money wasted. It is like overpaying on a debt that was going to be cancelled anyway.

According to the Institute for Fiscal Studies, around 73% of Plan 2 borrowers will not repay their loans in full before the 30-year write-off. Three out of four graduates. If you are in that majority, overpaying is throwing money into a hole.

When overpaying makes sense

There is one scenario where paying off your student loan early is rational: when you are going to repay it in full anyway, and doing so earlier saves you interest.

Let me give you a worked example.

Sarah graduated in 2015 with £45,000 of student debt. She is on Plan 2. She earns £65,000 and her salary grows at 3% per year. At the current interest rate of roughly 7.3% (RPI + 3%), her balance is actually growing, not shrinking.

But because her income is high, the maths says she will repay the full balance in around year 22. That means she is going to pay it all back plus 22 years of interest on a high balance. In her case, paying off a chunk early reduces the total interest she pays.

Tom graduated the same year with the same £45,000 debt. He earns £35,000 and his salary grows at 2% per year. His annual repayment is £693. At this rate, he will have repaid around £25,000 by the time the 30-year write-off kicks in. The remaining balance gets cancelled.

If Tom had taken £10,000 from his savings and thrown it at his student loan, it would not have changed his monthly payments (they are based on income, not balance). It would simply mean £10,000 less gets written off. He has essentially donated £10,000 to the Student Loans Company for no benefit.

How to know which camp you are in

The Martin Lewis Student Loan Calculator is the best free tool for this. You plug in your plan type, balance, salary, and expected salary growth, and it tells you whether you are on track to repay in full or have the balance written off.

If the calculator shows your balance being written off, do not overpay. Put that money into your ISA or your pension instead.

If the calculator shows you repaying in full, consider overpaying, but only after you have:

1. Built an emergency fund
2. Cleared any high-interest debt (credit cards, overdrafts)
3. Maxed your employer pension match
4. Used your ISA allowance

Student loan interest, even at 7%, is lower priority than a credit card at 24%. And your employer pension match is free money. Get those sorted first.

The “graduate tax” mindset

The smartest way to think about your student loan is as a graduate tax. You pay 9% on earnings above the threshold, it comes out automatically, and eventually it stops. You didn’t borrow £50,000 from a mate who wants it back. You entered into a conditional arrangement with the government that says “pay us 9% of your earnings above X for 30 years, then we’re done.”

Once you see it this way, the anxiety around the balance shrinks. A £60,000 balance sounds terrifying. But if you are never going to repay it, the balance is irrelevant. What matters is the monthly payment, which is directly proportional to your income.

Plan 1: a special case

If you are on Plan 1, the maths is different. The interest rate is much lower (currently around 4.3%), the balance is usually smaller (tuition fees were £3,000 to £3,500 per year), and many Plan 1 borrowers will repay in full.

If you are on Plan 1 with a remaining balance of £10,000 to £15,000 and you earn a reasonable salary, there is a decent chance you will repay it. In that case, making a lump sum payment could save you a few hundred pounds in interest. But run the numbers first. Don’t guess.

Plan 5: the 40-year trap

Plan 5, introduced in September 2023, has a lower threshold (£25,000) and a 40-year repayment window. The lower threshold means graduates start repaying sooner, and the 40-year window means more people will eventually repay in full. The government designed it this way deliberately.

If you are a young person starting university now, you are looking at repayments potentially running until your early 60s. That makes the calculation harder, because predicting your salary trajectory over 40 years is impossible. My advice for Plan 5 borrowers: focus on increasing your income, max your pension and ISA contributions, and revisit the student loan question every few years as your career develops.

What about paying it off to improve your mortgage application?

This comes up a lot. The answer is: your student loan repayment reduces your disposable income, which lenders factor into affordability checks. But paying off the balance early does not remove the monthly payment from their calculation until it is fully cleared.

If you owe £40,000 and can only afford to pay off £15,000, your monthly repayment doesn’t change. You would need to clear the entire balance to improve your mortgage affordability. For most people, that £15,000 is better used as a larger deposit, which improves your loan-to-value ratio and gets you a better mortgage rate.

The bottom line

For most graduates, student loan repayment is a non-decision. It happens automatically. It adjusts with your income. And it goes away after 30 (or 40) years. Treat it like a tax, focus your spare money on building wealth through investing and pensions, and only consider early repayment if the maths specifically shows you will repay in full.

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