Should I Pay Off My Student Loan?

Contents

• Plan 1 vs Plan 2 Loans
• Opportunity Cost
• The Impact of Interest Rates
• Should You Pay Off Your Student Loan Early?
• The Practical Takeaway
• Author's Take
• Frequently Asked Questions

For many people in the UK, student loans are one of the first large financial obligations they encounter. Deciding whether to aggressively pay them down or simply make the required repayments depends heavily on which loan plan you are on and what alternative uses you have for your money.

Plan 1 vs Plan 2 Loans

UK student loans generally fall into two major categories:

Plan 1

• Interest rate is usually linked to the Bank of England base rate or inflation, whichever is lower.
• Repayments are 9% of income above the repayment threshold.
• The interest rate tends to be relatively modest.

Plan 2

• Interest rates can be significantly higher, often linked to inflation (RPI) plus an additional percentage depending on income.
• Repayments are also 9% above the threshold, but the balance can grow much faster.

The key difference is that Plan 2 loans can accrue interest at much higher rates, sometimes approaching levels that make people uncomfortable carrying the debt.

Opportunity Cost

One of the most important concepts in personal finance is opportunity cost: what you give up by choosing one option over another.

Historically, global stock markets have returned roughly 10% per year before inflation over long periods. If you aggressively pay down a student loan with an effective interest rate lower than that, you may be giving up the chance to earn higher returns in the stock market.

For example:

• Student loan interest: 4-7%
• Expected stock market return: ~10%

In that scenario, investing might produce more wealth over time than early repayment.

The Impact of Interest Rates

Interest rates change the equation dramatically.

If your loan interest rate rises close to or above expected investment returns, the benefit of investing instead of repaying shrinks. In that case, paying down the loan can act as a guaranteed risk‑free return equal to the interest rate.

However, UK student loans also have a major caveat: they are written off after a fixed number of years. For many borrowers, especially on Plan 2, the loan behaves more like an additional tax rather than a traditional debt.

Should You Pay Off Your Student Loan Early?

This is the question most graduates actually wrestle with. You have some spare cash each month after covering expenses. Should you make voluntary overpayments on your student loan, or put that money somewhere else?

The answer depends on two things: your loan plan and whether you are likely to repay the full balance before it gets written off.

When early repayment makes sense

• Plan 1 borrowers on decent salaries. Plan 1 interest rates are low (currently capped at the Bank of England base rate or RPI, whichever is lower). But the write-off period is 25 years from the April after graduation, or age 65. If you are on track to repay the full balance anyway, making overpayments saves you interest. Check your balance and repayment trajectory on the Student Loans Company website.
• High earners on Plan 2. If you earn well above the threshold and your balance is modest enough that you would repay it all before the 30-year write-off, overpaying reduces the total interest you hand over. Run the numbers: if your remaining balance is £15,000 and you earn £60,000, you will likely clear it through normal repayments. Overpaying just brings that date forward and saves some interest.
• People who value being debt-free. This is not purely a mathematical decision. Some people sleep better knowing the loan is gone, and there is real value in that psychological freedom.

When early repayment is a bad idea

• Plan 2 borrowers who will never repay in full. This is the big one. If your loan balance is £50,000+ and you earn an average salary, the maths strongly suggests you will not repay the full amount before the 30-year write-off. In that case, every voluntary overpayment is money you would never have had to pay back. You are literally giving the Student Loans Company money for nothing.
• Anyone who has not built an emergency fund first. Overpaying a student loan while having no savings is risky. Your loan repayments pause if you lose your job. Your rent does not.
• Anyone who has not started investing. If you are choosing between a student loan overpayment at 4-7% interest and investing in a global tracker returning 7-10% historically, the investment typically wins over long time horizons. Use our compound interest calculator to see how early investing compounds.

Plan 5: the newest option

Students who started courses from August 2023 are on Plan 5. The repayment threshold is lower than Plan 2 (£25,000 vs £27,295 in 2025-26), but the interest rate is capped at RPI only, with no additional income-linked percentage. The write-off period is 40 years. Plan 5 is designed so more graduates repay in full, making early repayment maths different from Plan 2. If you are on Plan 5, the lower interest rate means investing surplus cash is almost certainly the better choice.

The Practical Takeaway

For many borrowers:

• Treat repayments as a graduate tax
• Prioritise investing and building assets
• Only consider aggressive repayment if you are on track to repay the full balance before write-off and the interest rate is high
• Build an emergency fund and start investing before making any voluntary overpayments

The correct answer depends on your loan plan, income trajectory, and whether you will realistically repay in full before the write-off date.

Frequently Asked Questions

Is a UK student loan actually a debt I need to worry about?

For most UK graduates, especially on Plan 2, the student loan behaves more like a graduate tax than a traditional debt. Repayments are income-contingent (9% above the threshold), the balance is written off after 30 years, and missing payments does not affect your credit score. The question is not "should I eliminate this debt?" but "is paying it down faster than the minimum a good use of this money?"

Should I pay off my student loan or invest the money?

If your loan interest rate is lower than your expected investment return (roughly 7-10% per year in a diversified global index fund over the long term), investing the surplus generally produces more wealth than early repayment. If your rate is very high or you are a very high earner likely to repay the full balance anyway, early repayment becomes more rational.

What happens if I never pay off my student loan?

For Plan 2 borrowers, the outstanding balance is written off 30 years after the April following graduation. For Plan 5 (post-2023 starters), the write-off period is 40 years. Many graduates will never fully repay their loans - particularly those on average salaries - and the write-off means the total repaid is capped regardless.

Does my student loan affect my mortgage application?

It can reduce your borrowing capacity. Lenders assess affordability based on your disposable income, and student loan repayments reduce your take-home pay in the same way as any other outgoing. The effect is usually modest unless you are at the borrowing limit, but it is worth being aware of.

Are Plan 1 and Plan 2 loans treated differently?

Yes. Plan 1 has lower interest rates (currently capped at Bank of England base rate or RPI, whichever is lower), a lower repayment threshold, and a shorter write-off period (25 years from the April after graduation, or age 65, whichever comes first). Plan 2 carries higher interest rates and a 30-year write-off window. Plan 1 holders are more likely to benefit from early repayment given the lower interest cost and shorter write-off window.

Further Reading:

I Will Teach You To Be Rich - Ramit Sethi - Covers the full sequence of personal finance decisions for young adults in the UK and US, including how to think about student debt alongside investing, ISAs, and building a financial system that works automatically. (Affiliate link - we may earn a small commission at no extra cost to you.)

The Financial Times Guide to Investing - Glen Arnold - A comprehensive UK-specific guide to investment principles and financial decision-making, providing context for the opportunity cost arguments central to the student loan debate. (Affiliate link - we may earn a small commission at no extra cost to you.)

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