Most UK university graduates leave with a student loan. But few really understand how their repayments work — how much they pay, what interest is charged, and whether the loan will ever actually be cleared. This guide covers everything you need to know about UK student loans.
What Is a UK Student Loan?
UK student loans are government-funded loans provided by the Student Loans Company (SLC). They cover tuition fees and living costs while studying. Unlike commercial loans, repayments are income-contingent — you only repay when earning above a threshold, and the balance is written off after a set number of years.
Student Loan Plans Explained
There are several plan types depending on when and where you studied.
Plan 1 (Pre-2012)
Plan 1 applies to students who started university before September 2012 in England and Wales (and some earlier Scottish and Northern Irish students).
- Repayment threshold: £22,015 per year
- Repayment rate: 9% of income above the threshold
- Write-off period: Written off after 25 years (reduced from 30 years for some borrowers)
- Interest rate: Based on Retail Prices Index (RPI), typically around 1.5% to 3% depending on when the loan was taken out
Plan 1 borrowers tend to have smaller loan balances than Plan 2 borrowers, but the lower threshold means repayments start sooner.
Plan 2 (Post-2012)
Plan 2 applies to students who started university in England or Wales from September 2012 onwards. This covers most current students.
- Repayment threshold: £27,295 per year
- Repayment rate: 9% of income above the threshold
- Write-off period: Written off after 40 years
- Interest rate: RPI + 3% while studying. After graduation, the rate varies from RPI to RPI + 3% depending on income. Higher earners pay more interest.
Plan 2 loans have much larger balances — often £30,000 to £50,000 or more — and the 40-year write-off period means many borrowers will never repay in full.
Plan 4 (Scotland)
Plan 4 applies to Scottish students studying in Scotland or those who started Scottish-domiciled courses.
- Repayment threshold: £27,660 per year
- Repayment rate: 9% of income above the threshold
- Write-off period: Written off after 40 years
- Interest rate: RPI, capped at 1.5% above RPI
Plan 4 has a slightly higher threshold than Plan 2, meaning lower monthly repayments for the same salary.
Postgraduate Loan
A separate loan exists for postgraduate master’s study.
- Repayment threshold: £21,000 per year
- Repayment rate: 6% of income above the threshold
- Write-off period: Written off after 40 years
- Interest rate: RPI + 3%
If you have both an undergraduate and postgraduate loan, you repay both simultaneously — 9% plus 6% above the relevant thresholds.
How Repayment Works
Repayments are automatic through payroll. There is no choice about when or how much you repay. Your employer deducts the correct amount before you receive your salary, just like income tax.
Key points:
- You only repay when your income exceeds the threshold for your plan type
- Repayments are calculated on gross (pre-tax) income
- If you have multiple plan types, each is calculated separately
- If you drop below the threshold (e.g. due to reduced hours), repayments stop automatically
- You cannot choose to make manual repayments to the SLC through payroll — overpayments must be arranged directly with the SLC
Interest Rates
Interest is charged from the day the loan is taken out, including while studying.
| Plan | Interest Rate |
|---|---|
| Plan 1 | RPI (varies, typically 1.5%–3%) |
| Plan 2 | RPI + 3% while studying; RPI to RPI + 3% post-graduation depending on income |
| Plan 4 | RPI, capped at 1.5% above RPI |
| Postgraduate | RPI + 3% |
Plan 2 interest is income-linked after graduation:
- Earnings under £27,295: RPI only
- Earnings £27,295 to £49,130: RPI + up to 3% (sliding scale)
- Earnings over £49,130: RPI + 3%
This means higher earners are charged more interest — a deliberate policy choice to make the system more progressive.
Should You Repay Early?
For most borrowers, the answer is no. Here is why:
- Most Plan 2 borrowers will not repay their loan in full before the 40-year write-off
- Overpayments reduce the balance but do not reduce future monthly payments (which are fixed at 9% of income above the threshold)
- The money spent on overpayments could often earn more invested elsewhere
- Student loans do not appear on credit reports and do not affect your credit score
When Overpaying Makes Sense
- You are a high earner (£50,000+) and will repay the full balance before write-off
- You want the psychological benefit of being debt-free
- You have already maxed out pension contributions and ISA allowances
If you are considering overpaying, check your balance and projected repayments on the SLC website first. Most people are surprised how little of their balance they actually repay.
Mortgage Impact
Student loans can affect mortgage applications, though not always in the way you might expect.
- Most lenders treat student loan repayments as an committed expense, reducing the amount they will lend
- However, some lenders ignore student loan repayments in their affordability calculations
- Student loans do not appear on your credit file as a standard debt
- Lenders may ask about student loans on application forms, but the impact varies between providers
If you are close to a mortgage application, it is worth checking how different lenders treat student loan repayments. An independent mortgage broker can help you find lenders that are more favourable.
Worked Example: Plan 2 Graduate
Let us see how this works in practice for a typical Plan 2 graduate.
Scenario: Salary of £30,000, Plan 2 loan balance of £45,000.
Monthly repayment:
Income above threshold: £30,000 - £27,295 = £2,705
9% of £2,705 = £243.45 per year = £20.29 per month
Annual interest charge:
Assuming RPI + 3% while studying and RPI + 1.5% post-graduation: approximately 7% on £45,000 = £3,150 per year
The critical problem: You are paying £243 per year but being charged £3,150 in interest. The loan balance is growing, not shrinking. Even at a more conservative 5% interest rate, you would pay £243 while being charged £2,250.
This is why early repayment rarely makes financial sense for Plan 2 borrowers on average or below-average salaries.
Tips for Managing Your Student Loan
- Check your plan type — Log in to the Student Loans Company website to confirm which plan you are on and what your balance is
- Do not overpay unless you are a high earner — For most people, the loan will be written off before it is fully repaid
- Factor student loan repayments into mortgage affordability — They reduce the amount you can borrow, so plan accordingly
- Understand your interest rate — Higher earners on Plan 2 pay significantly more interest
- Do not panic about the balance — Student loans are not like commercial debt. They are repaid through the tax system and written off after the term ends
- Keep your details up to date with the SLC — Especially if you move abroad, as different rules apply to overseas borrowers
- Consider voluntary contributions carefully — Contact the SLC before making any overpayments to understand the implications
Resources
- Student Loans Company: www.gov.uk/student-finance
- MoneyHelper Student Loan Repayment Calculator: www.moneyhelper.org.uk
- GOV.UK Check Your Student Loan Balance: www.gov.uk/repaying-your-student-loan