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Undercurrent · Research Report · Personal Finance

The Loan You
Never Agreed To

Most graduates think they took out a loan to go to university. They didn't — not in any meaningful sense of the word. They signed up to a 30-year graduate tax that's collected through payroll, charges interest that has at points exceeded 7%, and is sold by the government to private investors. The Student Loans Company isn't a lender — it's a collections agency for a financial product that was designed to look like a loan but behave like a tax. Your reader is almost certainly repaying one and has never understood what they actually signed.

FinancePolicyEducationTaxation
25%
Plan 2 borrowers
expected to repay in full
9%
Marginal tax rate
on earnings above threshold
53%
RAB charge
expected government write-off
48p
Per £1 of face value
received in 2017 loan book sale

If you went to a UK university after 2012, you probably receive an annual statement from the Student Loans Company. It shows a principal amount, an alarming amount of accrued interest, and a total balance that seems to grow regardless of how much you pay. You probably feel a low-level anxiety about this "debt." But here is the reality: you do not have a loan. A real loan has a fixed amount, a repayment schedule, and you pay it off. What you actually signed up for is a 30-year, 9% income tax surcharge with a sunset clause, wrapped in the psychological packaging of American-style debt. The government calls it a loan, but it functions entirely differently — and misunderstanding that difference is costing graduates thousands of pounds.

01
The Mechanism

It's not a loan

To understand why UK student finance is not a loan, you have to look at the repayment mechanism. If you take out a £10,000 bank loan at 5% interest over five years, your monthly repayment is fixed. If your salary halves, you still owe the same monthly amount. If you lose your job, you default, and your credit score is destroyed.

UK student finance does not work like this. Under Plan 2 (for students who started between 2012 and 2022), you repay exactly 9% of everything you earn above the repayment threshold — currently £28,470, rising to £29,385 in April 2026 — regardless of how much you borrowed. If you earn less than the threshold, you pay nothing. If your income drops, your repayments drop instantly. If you never earn above the threshold, you never repay a penny. And crucially, after 30 years, whatever balance remains is entirely written off with zero adverse consequences for your credit file.

"We estimate those in the lowest 10% of lifetime earnings will pay back around £9,500, because they will rarely earn above the repayment threshold. The highest-earning half of graduates can expect to repay around £74,000."

— Institute for Fiscal Studies (2026)

The Institute for Fiscal Studies (IFS) estimates that only approximately 25% of Plan 2 borrowers will ever repay their loan in full. For the other 75%, the size of the balance is entirely irrelevant to what they will actually pay. Whether their statement says they owe £40,000 or £400,000, their monthly deduction will be exactly the same: 9% of their earnings above the threshold, until the 30-year clock runs out.

This makes the Student Loans Company (SLC) fundamentally different from a bank. The SLC is a non-departmental public body that makes no lending decisions. There is no credit check, no affordability assessment, and no underwriting. Everyone who applies gets funded. The SLC does not even collect the money directly — it administers disbursement, while collection is handled via HMRC payroll. Your employer deducts the repayment before you even see your payslip, exactly like income tax and National Insurance.

The government calls it a student loan. You repay 9% of your earnings for 30 years and then it disappears. That's not a loan — it's a time-limited graduate tax with a marketing problem.

02
The Interest Rate Scandal

The beyond-Google reality

If the balance doesn't matter for most people, why does the interest rate matter? Because for the minority of higher earners who will repay their loans, the interest rate applied to Plan 2 is punitive compared to almost any commercial lending product.

Plan 2 loans are charged interest at the Retail Prices Index (RPI) plus up to 3% while studying. After graduation, the rate scales with income: RPI for those earning up to the threshold, rising to RPI + 3% for higher earners. The mechanism is brutal because interest accrues from day one of university. By the time a student graduates with a £45,000 principal balance, they may already owe over £50,000 because interest accumulated during their three-year degree.

Beyond Google

In 2023, when RPI inflation spiked to 13.5%, the government was forced to intervene, capping student loan interest at 7.3%. But even this capped rate was higher than most commercial mortgage rates at the time. The government effectively acknowledged that the Plan 2 interest mechanism was indefensible when they introduced Plan 5 for students starting from 2023 onwards. Plan 5 loans are charged at CPI + 0% — meaning the loan only grows with inflation, charging zero real interest. But the 5.8 million graduates on Plan 2 are locked into the RPI + 3% system for life.

This creates a bizarre financial reality. For a graduate earning £30,000, the interest rate is irrelevant — they will pay £55 a year, barely denting the balance before it is written off. But for a graduate earning £70,000, they will pay over £3,600 a year. They will eventually clear the balance, but because of the RPI + 3% interest rate, they will pay back tens of thousands of pounds more than they borrowed.

FeaturePlan 1 (Pre-2012)Plan 2 (2012-2022)Plan 5 (2023+)
Repayment Threshold£24,990£28,470 (frozen to £29,385)£25,000
Repayment Rate9% above threshold9% above threshold9% above threshold
Interest RateRPI or Base+1% (lower)RPI to RPI + 3%CPI + 0%
Write-off Period25 years (or age 65)30 years40 years

The Three Tiers of UK Student Finance

03
The Fiscal Illusion

Who actually pays

The government sells your debt. Since 2017, the government has sold tranches of the student loan book to private investors. The mechanism is straightforward: the government sells the future repayment stream at a discount. The buyer (typically institutional investors) gets the right to collect repayments over the remaining term. The government gets cash upfront. The terms of your loan don't change — but the entity profiting from your repayments does.

The controversy lies in the discount. In December 2017, the government completed its first sale of loans to private investors. The loans, which had a face value of £3.5 billion, were sold for £1.7 billion. The government received 48p for every £1 of loans sold. Why? Because the market knows most loans won't be repaid in full. Critics argue this is privatising profit while socialising the write-off cost.

Most graduates will never repay their student loan in full. But they'll spend 30 years feeling anxious about a number on a statement that was never going to reach zero.

This brings us to the Resource Accounting and Budgeting (RAB) charge. The RAB charge is the percentage of student loans the government expects to never recover. For Plan 2, this was estimated at approximately 53% — meaning the government lends £100 and expects to get back £47. The rest is written off and becomes public expenditure, spread over 30 years.

The implication is profound. The government replaced upfront university grants (which appeared as immediate spending on the balance sheet) with loans (which appear as assets). This made the fiscal position look better in the short term, even though the long-term cost to the taxpayer may be similar or higher. The "loan" framing was as much an accounting trick as a policy choice.

04
The Mis-Selling Question

The biggest scandal

18-year-olds sign up for a financial product with a 30- to 40-year term, variable interest rates, and no affordability check. They are told it's a "loan" when it doesn't function like one. They see a balance growing due to interest and feel anxious about "debt" that, for most of them, will never be repaid.

Martin Lewis, founder of MoneySavingExpert, has argued that calling it a loan is "the biggest mis-selling scandal of modern times" because it changes behaviour. Graduates overpay voluntarily to "clear their debt" when keeping that cash in savings or a pension would be financially superior.

Graduate earning £30k (Repays £55/year)
55
Graduate earning £45k (Repays £1,405/year)
1405
Graduate earning £70k (Repays £3,655/year)
3655

The maths is unforgiving. For a median earner on Plan 2, voluntarily overpaying is almost always the wrong financial decision. If you earn £30,000, you repay £55 a year. If you voluntarily overpay £10,000 to reduce your balance from £50,000 to £40,000, your monthly repayment does not change. It is still 9% of your earnings above the threshold. You still won't clear the balance before the 30-year write-off. You have simply given the government £10,000 for free.

05
The International Context

The worst of both worlds

The UK system is unique in its dysfunction. In Germany, most public universities charge no tuition, funded entirely through general taxation. In Scotland, there are no tuition fees for Scottish students, funded by the block grant (though this means Scottish universities receive less per-student funding than their English counterparts).

In the United States, student finance involves genuine loans with genuine repayment obligations. There is no write-off period, bankruptcy does not clear them, and the average federal debt exceeds $37,000. In Australia, the HECS-HELP system is income-contingent like the UK, but it is indexed to CPI, not RPI, and charges no real interest — just an inflation adjustment.

The UK system looks like the US system (a massive balance, framed as "debt") but functions like the Australian system (income-contingent, eventual write-off). It is the worst of both worlds: the psychological burden of American-style debt combined with the fiscal cost of a free education system.

You didn't take out a loan. You signed up for a 30-year graduate tax. The sooner you realise that, the sooner you can stop worrying about the balance.

Sources & Further Reading
  • Institute for Fiscal Studies (IFS). (2026). "How do Plan 2 student loans work, and how have they changed over time?"
  • Institute for Fiscal Studies (IFS). (2026). "Are Plan 2 student loans 'unfair'?"
  • National Audit Office (NAO). (2018). "The sale of student loans."
  • Department for Business, Innovation & Skills. (2016). "The Resource Accounting and Budgeting (RAB) charge."
  • MoneySavingExpert / Martin Lewis. (2026). "Plan 2 student loan? Beware Government freezing repayment threshold."
  • HM Government. (2025). "Student loan forecasts, England: 2024 to 2025."
  • House of Commons Library. (2026). "Student loans: Interest rates and repayment thresholds FAQs."

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