Student loans are how most people fund university in the US, UK, and Canada, but the three systems could hardly be more different. The difference is not just in how much you borrow. It is in what interest rates apply, when repayments begin, whether the loan touches your credit file, and above all whether the debt is ever genuinely meant to be fully repaid. In the US, a federal loan behaves like a conventional debt. In the UK, it behaves more like a graduate tax, quietly writing itself off after a few decades. Canada sits in between, with an unusually forgiving repayment mechanism. This guide takes each system in turn, compares them side by side, and raises the question everyone eventually asks: should you pay extra, or invest instead?
United States: the most complex system
The US system offers the most repayment flexibility and, typically, the highest costs. Federal loans are issued by the Department of Education, and most undergraduates borrow through the Direct Loan programme, which comes in a few forms:
- Direct Subsidized loans are for undergraduates with financial need, with annual limits of $3,500–$5,500 and an interest rate of 6.53% for 2025-26. The government pays the interest while you are in school at least half-time.
- Direct Unsubsidized loans are open to undergraduates and graduate students, with annual limits of $5,500–$20,500. The rate is 6.53% for undergraduates and 8.08% for graduates, and interest accrues from day one.
- Direct PLUS loans, for parents of undergraduates and for graduate students, can cover the cost of attendance minus other aid, at a rate of 9.08%.
On repayment, the US offers several routes. The Standard plan fixes payments over 10 years — the highest monthly payment but the lowest total interest. The Graduated plan starts payments low and increases them every two years across 10 years. The Extended plan stretches fixed or graduated payments over up to 25 years. And the Income-Driven Repayment plans — SAVE, PAYE, IBR, and ICR — set payments by income and family size, with any remaining balance forgiven after 20–25 years.
There is also Public Service Loan Forgiveness (PSLF). Borrowers who work for a government agency or a qualifying nonprofit and make 120 qualifying monthly payments (ten years) under an income-driven plan get their remaining balance forgiven tax-free — one of the most valuable forgiveness programmes anywhere. Elsewhere, the US system is more muted: up to $2,500 a year of loan interest can be tax-deductible, deferment and forbearance options exist during hardship, there are no early repayment penalties, and — a surprise to many — federal loans do not die with the borrower, as the estate may remain responsible.
United Kingdom: a graduate tax in all but name
The UK treats student debt differently. Repayment is automatic through the employer under PAYE: you pay 9% of everything you earn above a threshold, with no choice about the monthly amount and no minimum you must hit. Two plans matter for most readers:
- Plan 2 covers loans taken from 2012 onwards. The repayment threshold is £27,295 a year, the rate is 9% above it, interest sits at RPI plus up to 3% depending on income, and the balance is written off 30 years after first repayment.
- Plan 5 covers loans from 2023 onwards. The threshold is £25,000 a year, the rate is 9% above it, interest is RPI (the Retail Prices Index, a measure of inflation), and the balance is written off 40 years after first repayment.
The consequences flow from that design. Earning £35,000 on Plan 5, you pay 9% of the £10,000 above the threshold — £900 a year, or £75 a month, whatever your balance is. The loan never appears as debt on a credit report. If you earn below the threshold you pay nothing, with no pressure to catch up. After 30 or 40 years the remainder is written off, and the loan is discharged on death. Early repayment is allowed without penalty, but for almost every borrower it is a mistake.
Canada: simpler, and quite forgiving
Canada combines federal and provincial loans, but the machinery is less sprawling than America’s. The federal Canada Student Loans charge interest of prime plus 0% on the floating option or prime plus 2% on the fixed option. Provincial governments layer on their own loans with varying terms; Ontario and Alberta, for instance, offer interest-free provincial loans. There are also Canada Student Grants — non-repayable money for students from low- and middle-income families, up to $6,000 a year for full-time students.
Repayment is where Canada stands out. After a six-month grace period following graduation, loans enter a Repayment Assistance Plan (RAP) in which payments are capped by income. In RAP Stage 1, your monthly payment is adjusted to what you can afford and the government covers the interest your payment does not. In RAP Stage 2, which begins after 60 months, the government starts repaying principal on your behalf. Any remaining balance is forgiven after 15 years of RAP.
A few extra details tilt the system further in borrowers’ favour: interest on federal student loans is tax-free as of 2025; there is no interest on the provincial portion in BC, Manitoba, Nova Scotia, PEI, and Quebec; and provincial loans in Quebec, Manitoba, and Saskatchewan are interest-free entirely.
The systems side by side
| Feature | US (federal) | UK (Plan 2/5) | Canada |
|---|---|---|---|
| Interest rates | 6.53–9.08% | RPI to RPI+3% | Prime to Prime+2% |
| Repayment trigger | Income + loan balance | Income only | Income + loan balance |
| Forgiven after | 20–25 years (IDR) or 10 years (PSLF) | 30–40 years | 15 years (RAP) |
| Impact on credit | Yes | No | Yes |
| Death discharge | No (estate responsible) | Yes | Yes |
| Early repayment penalty | No | No | No |
Two loans, two outcomes
The differences look abstract until they are costed. Take a UK graduate with a £40,000 Plan 5 loan, earning £35,000, and a US graduate with a $40,000 Direct Unsubsidized loan, earning $45,000.
The UK borrower repays 9% × (£35,000 − £25,000), which is £900 a year, or £75 a month. Assuming an average RPI of about 4%, the loan accumulates interest but the balance is written off after 30 years. The graduate repays roughly £27,000 in total and sees the rest — £40,000 plus accrued interest — wiped.
The US borrower on the 10-year Standard plan pays approximately $460 a month, roughly $55,200 in total, of which about $15,200 is interest. On an income-driven plan such as SAVE, the monthly payment drops to around $230 based on income, the balance is forgiven after 20 years, and around $55,200 is still repaid — with the forgiven amount depending on how interest accrues along the way.
The contrast is stark. The UK system is far more borrower-friendly: a £40,000 loan costs about £27,000 in total repayments however long you take, while a $40,000 US loan costs $55,000 or more under standard repayment. Put bluntly, the US system penalises high earners and rewards borrowers who qualify for PSLF or income-driven forgiveness.
Repay early or invest?
The honest answer depends on your country, your rate, and your temperament.
Early repayment tends to make sense if you hold private student loans with high interest rates (broadly 7% or more); if your loan rate comfortably exceeds what you could reliably earn investing — the long-term stock market average is often cited around 7–8%; if being debt-free matters to your peace of mind; or if you are in the US on a loan that does not qualify for any forgiveness programme.
It usually does not make sense if you are in the UK, where almost everyone is better off making the minimum repayment and investing the difference, because the loan is written off after 30 or 40 years; if you are in Canada and qualify for RAP, where minimum payments can be very low; if you are in the US and pursuing PSLF or income-driven forgiveness, where extra payments are simply wasted; or if you could earn more from investing than your loan charges.
As a general rule, compare your loan interest rate with your expected investment return. If the loan charges 6.53% and you can reasonably expect 8% from a diversified index fund, the maths leans towards investing; if the loan charges 9% or more, overpaying is hard to beat. For UK borrowers specifically, the maths almost always favours minimum repayments combined with investing, because most graduates never repay the full balance anyway.
The bottom line
Student loans vary enormously between countries, and the best strategy in one is often the worst in another. The US system offers the most repayment flexibility but the highest costs; the UK system is the most borrower-friendly — effectively a graduate tax with built-in forgiveness that never touches your credit file; and Canada sits in between, with a genuinely generous Repayment Assistance Plan. Wherever you graduate, the practical work is the same: understand your repayment plan, check whether forgiveness applies to you, track what you actually owe as rates change, and treat the repay-early-versus-invest question as the arithmetic problem it really is, not an emotional one. None of the above is tailored financial advice — for a decision this personal and long-running, it is worth running the numbers with a qualified adviser who knows your country’s system.