How Long Does It Take to Pay Off a Student Loan?

Why Repayment Length Varies So Much

Unlike a traditional mortgage or car loan, UK student loans do not have a fixed monthly payment. Instead, you repay a percentage of your income above a threshold, and the debt is written off after a set number of years if it has not been cleared. This means two graduates who borrowed the same amount can have wildly different repayment timelines depending on how much they earn throughout their careers.

The five active student loan plans in the UK each have different thresholds, interest rates, and write-off periods. Understanding which plan you are on is the first step to estimating how long your repayments will last. You can check your plan type by logging into your Student Loans Company account or by looking at your payslip, where the deduction code (SL1, SL2, SL4, or PGL) indicates your plan.

The Five Loan Plans at a Glance

Before diving into timelines, here is a summary of each plan's key parameters. These numbers determine the mechanics of your repayment and, ultimately, how long you will be paying:

• Plan 1 — Repayment threshold of £26,900 per year, 9% of income above the threshold, interest rate of 3.2%, and a write-off period of 25 years after the April you were first due to repay.
• Plan 2 — Repayment threshold of £29,385 per year, 9% of income above the threshold, variable interest between 3.2% and 6.2% depending on income, and a write-off period of 30 years.
• Plan 4 — Repayment threshold of £33,795 per year (for Scottish borrowers), 9% above the threshold, 3.2% interest, and a 30-year write-off.
• Plan 5 — Repayment threshold of £25,000 per year, 9% above the threshold, 3.2% interest, and a 40-year write-off period, the longest of all plans.
• Postgraduate Loan — Repayment threshold of £21,000 per year, 6% of income above the threshold, interest at 6.2%, and a 30-year write-off.

Typical Repayment Timelines by Salary

The table below shows approximate years to full repayment for a graduate with a £50,000 starting balance (or £25,000 for Postgraduate Loans) at various salary levels, assuming a 3% annual salary increase. If full repayment does not happen before the write-off date, the remaining balance is cancelled. Remember that these figures are estimates — actual results depend on exact interest rates and salary trajectories over decades.

Plan 1 (£26,900 threshold, 9%, 3.2% interest, 25-year write-off)

At a £30,000 starting salary, annual repayments begin at roughly £279. After adjusting for 3.2% interest on a £50,000 balance, the debt grows faster than repayments in the early years. With 3% salary growth, most Plan 1 borrowers on this trajectory clear the loan in around 20 to 23 years. At a £40,000 starting salary, repayments start at around £1,179 per year, and the loan is typically cleared in 14 to 17 years. At £50,000, repayments start above £2,079, and you could be debt-free in 10 to 13 years. The 25-year write-off acts as a safety net, but many Plan 1 borrowers do repay in full because the interest rate is relatively low.

Plan 2 (£29,385 threshold, 9%, 3.2–6.2% interest, 30-year write-off)

Plan 2 is the most common plan for English and Welsh students who started university from 2012 onward, and it carries the highest potential interest rate. At a £30,000 salary, annual repayments are only around £55 — far too little to outpace interest on a large balance. The debt grows year-on-year, and the graduate never repays in full; the balance is written off after 30 years. At a £40,000 salary, repayments are about £955, still unlikely to clear a £50,000 debt with interest rates above 4%. Full repayment typically requires a starting salary above £50,000 or an initial balance well below £40,000. Government figures suggest that the majority of Plan 2 borrowers will see their loan written off.

Plan 4 (£33,795 threshold, 9%, 3.2% interest, 30-year write-off)

Scottish borrowers on Plan 4 benefit from a higher threshold, meaning lower annual repayments at any given salary but also a slower pace of clearing the principal. A graduate on £30,000 does not repay anything because the salary is below the £33,795 threshold. At £40,000, annual repayments are approximately £558, and with 3.2% interest, full repayment of a £50,000 balance is unlikely before the 30-year mark. At £50,000, repayments are around £1,458 per year, and the loan may be cleared in the final years of the write-off window. The combination of a high threshold and moderate interest means Plan 4 loans are often partially written off.

Plan 5 (£25,000 threshold, 9%, 3.2% interest, 40-year write-off)

Plan 5 is the newest plan, introduced for students starting courses from August 2023. It has the longest write-off period at 40 years, but also the lowest threshold. At £30,000, annual repayments of around £450 are slightly higher than Plan 2 at the same salary, and the lower interest rate of 3.2% means the balance does not spiral as quickly. With four decades of repayments and steady salary growth, many Plan 5 borrowers are expected to repay in full, which was one of the government's intentions when designing this plan. At £40,000, repayments are approximately £1,350, and full clearance could occur within 18 to 22 years. At £50,000, the estimate drops to 12 to 15 years.

Postgraduate Loan (£21,000 threshold, 6%, 6.2% interest, 30-year write-off)

Postgraduate Loans are smaller in value (maximum around £13,206 for a Master's course) but carry a high interest rate of 6.2%. Repayments are 6% of income above £21,000, which runs concurrently with any undergraduate loan repayments. At a £30,000 salary, annual postgraduate repayments are £540. Despite the smaller balance, the 6.2% interest means that a £25,000 postgraduate loan at a £30,000 salary grows over time. At £40,000, repayments of £1,140 should outpace interest, and the loan could be cleared in around 15 to 20 years. At £50,000 it might take 8 to 12 years.

Factors That Affect Your Timeline

Several factors interact to determine how long your repayments will last. Understanding these can help you make informed financial decisions, even if you cannot precisely predict the outcome over a multi-decade horizon.

Salary Growth

Your starting salary matters, but your long-term earnings trajectory matters more. A graduate who starts on £25,000 but reaches £60,000 within a decade will repay far more — and faster — than one who stays around £30,000. Promotions, career changes, and industry shifts all play a role. Using a student loan calculator with different salary growth assumptions can give you a range of possible outcomes rather than a single estimate.

Interest Rate

Interest is charged from the day your first payment is made to your university. For Plan 2, the rate is linked to RPI plus up to 3%, which means in periods of high inflation the rate can exceed 7%. Plan 1, Plan 4, and Plan 5 use the lower of RPI or the Bank of England base rate plus 1%. Higher interest means your balance grows faster, making full repayment less likely and extending the effective repayment period.

Balance Size

Students who attended university for four years, took maintenance loans, or studied in London typically leave with larger balances. A graduate with £60,000 of Plan 2 debt faces a much steeper hill than one with £30,000. Larger balances accrue more interest in absolute terms, creating a compounding effect that is difficult to overcome without a high salary.

Extra Payments

You can make voluntary repayments at any time. If you are on track to repay in full before the write-off date, extra payments reduce interest costs. However, if you are unlikely to clear the balance, voluntary payments simply mean you pay more in total without any benefit. This counter-intuitive feature of UK student loans is one of the most important things to understand before making extra payments.

Periods of Low or No Earnings

If you take time out of work — for parenting, illness, travel, or further study — you make no repayments during those periods (assuming your income falls below the threshold). The loan continues to accrue interest, but you are protected from unaffordable payments. This extends the timeline but does not change the write-off date, so in some cases, it means more of the loan is written off.

The Write-Off: Your Guaranteed End Date

Every UK student loan plan has a built-in end date. Regardless of how much you still owe, the remaining balance is cancelled after the write-off period expires. This is one of the defining features of the UK system and is why student loans are often described as a graduate tax rather than a true debt. The write-off is not taxable — you do not owe anything on the cancelled amount.

For Plan 1 borrowers, the write-off occurs 25 years after the April you were first due to repay, or when you turn 65, whichever comes first. For Plan 2, it is 30 years after the April you were first due to repay. Plan 4 is also 30 years, and Plan 5 extends to 40 years. Postgraduate Loans follow the same 30-year rule as Plan 2.

The practical effect is that the write-off date, not your repayment speed, determines the maximum possible duration of your student loan. If you are not on track to repay before that date, your repayment "length" is simply the write-off period itself.

Worked Examples

Example 1: Plan 2, £45,000 Balance, £28,000 Starting Salary

At £28,000, this graduate earns less than the Plan 2 threshold of £29,385, so they repay nothing in year one. With 3% salary growth, they cross the threshold in year two, paying roughly £2 per month. By year ten their salary is around £37,600 and annual repayments are approximately £739. Interest at 3.2% on £45,000 adds about £1,440 in year one alone, meaning the balance has grown to nearly £47,000 before any repayment is made. Over 30 years the graduate repays a total of around £35,000 but the balance — inflated by three decades of interest — is considerably higher. The remaining amount is written off. Total cost: approximately £35,000 over 30 years.

Example 2: Plan 1, £30,000 Balance, £35,000 Starting Salary

This graduate starts above the Plan 1 threshold of £26,900. Annual repayments begin at £729. Interest at 3.2% on £30,000 adds £960 in year one, so the balance initially grows slightly. However, with 3% salary growth, repayments increase each year and by year four they exceed interest accrual. The balance starts declining steadily around year five. By approximately year 18 to 20, the loan is fully repaid — well within the 25-year write-off window. Total cost: approximately £38,000 including interest.

Example 3: Plan 5, £50,000 Balance, £32,000 Starting Salary

On Plan 5, the threshold is £25,000 and the interest rate is 3.2%. At £32,000 the graduate repays £630 per year initially. Interest adds £1,600 to the £50,000 balance in year one, so the balance grows. With 3% annual salary growth, repayments surpass interest accrual by around year six. Given the 40-year write-off window, this graduate has much longer to repay. Full repayment is projected at approximately year 25 to 28, depending on exact salary progression. The extended window means Plan 5 borrowers are more likely to repay in full compared to Plan 2 borrowers with similar balances and salaries.

Should You Try to Pay Off Faster?

For most borrowers, particularly those on Plan 2, the answer is no. The loan functions more like a tax than a debt: you pay 9% of earnings above the threshold regardless of the balance, and whatever remains is cancelled. Overpaying only benefits you if you would have repaid the full amount anyway, in which case each extra payment reduces the interest you pay. If you are unsure, run the numbers through our student loan repayment calculator to see whether you are projected to repay in full.

The key insight is that your repayment length is determined by your earnings, not by your balance. A higher salary means faster repayment and, if you clear the loan before write-off, lower total cost. But if you are not on track to repay in full, focusing on other financial goals — saving for a house deposit, building an emergency fund, or investing in a pension — is almost always a better use of your money than making voluntary student loan repayments. Check your payslip deductions to see exactly how much you are currently repaying each month, and use that as a starting point for your planning.

Key Takeaways

• Repayment length depends mainly on salary, not on the balance.
• Most Plan 2 borrowers will have their loan written off after 30 years.
• Plan 1 and Plan 5 borrowers are more likely to repay in full.
• Interest rates matter — Plan 2's variable rate can exceed 7%.
• Extra payments only help if you are on track to repay before write-off.
• The write-off is tax-free and automatic — no application needed.
• Use a calculator to model different salary scenarios over time.