Understanding SOFR and how it affects your international student loan rate
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SOFR drives the variable part of your student loan rate — but most borrowers don't know what it actually is. This guide breaks it down clearly, so you understand exactly what moves your rate and why.
You've spotted three letters in your loan terms — SOFR — and you're not entirely sure what they mean or why they matter.
You're not alone. SOFR sits quietly behind a lot of variable-rate loans, and understanding it is the difference between feeling in the dark about your rate and knowing exactly what drives it.
Here's what you need to know about!
What SOFR actually is
SOFR stands for the Secured Overnight Financing Rate. It's a benchmark interest rate published in the US that reflects, roughly, what it costs banks to borrow money overnight using safe collateral. It's set based on real market transactions, which is why it's widely trusted as a reference point.
You don't need to track SOFR daily or understand the machinery behind it. What matters for you as a borrower is this: SOFR is a benchmark that moves with the wider interest-rate environment, and a lot of variable-rate loans — including international student loans — use it as their starting point.
Read more: Prodigy Finance – SOFR · What is SOFR? · What is the difference between APR and the Interest Rate?
How your rate is actually built
This is the part worth internalising. A variable interest rate on a student loan is usually made of two pieces added together:
A base rate (SOFR). This is the benchmark component. It moves over time as the market moves, which is what makes the rate "variable".
A fixed margin. This part is set based on your individual profile when your loan is priced, and it stays the same for the life of the loan.
Add the two together and you get your total interest rate:
Base rate (SOFR) + your fixed margin = your interest rate.
With Prodigy Finance, the base rate component is 3.64%*, and your fixed margin depends on your profile. The representative interest rate combines the two, and the representative APR — the all-inclusive figure that also folds in mandatory fees — is 13.38%*.
Why "variable" cuts both ways
Because part of your rate is tied to SOFR, your total rate can change over the life of the loan. If SOFR rises, your rate rises. If SOFR falls, your rate falls. Your fixed margin, however, doesn't move — so only the base-rate portion is exposed to these shifts.
It's important to sit with both sides of that. A variable rate isn't a one-way street to higher costs; it can decrease as well as increase. What it does mean is a little less certainty than a fixed rate, which is a trade-off worth understanding rather than fearing.
APR versus interest rate — the difference that trips people up
These two terms get used interchangeably, but they're not the same:
The interest rate is the base rate plus your margin.
The APR is the all-inclusive cost of borrowing — the interest rate plus any mandatory fees, expressed as a single annual percentage.
The APR is the more useful number when you're comparing lenders, because it captures the true cost rather than just the headline rate. Two loans with the same interest rate can have different APRs if one carries higher fees.
What this means for you as a borrower
A few practical takeaways:
Your margin is locked; your base rate isn't. When you read about rates rising or falling in the news, it's the SOFR portion of your rate that's affected, not your whole rate.
Budget with a little headroom. Because the rate can move, it's sensible to leave some room in your repayment plan rather than budgeting to the last dollar at today's rate.
Compare on APR. When you weigh up lenders, line up the representative APRs for the fairest comparison.
Why lenders use a benchmark at all
It might seem simpler to just quote one fixed number. But tying part of the rate to a transparent, market-based benchmark like SOFR means the pricing reflects real conditions rather than a lender's guesswork. It's a widely used, standardised approach — and because SOFR is published openly, you can always see the benchmark your rate is built on.
The bottom line
SOFR isn't something to be intimidated by. It's simply the benchmark that forms one half of a variable rate — the half that moves — while your fixed margin stays put. Understand that split, compare loans on APR, and build a little flexibility into your budget, and you'll be in control of your loan rather than the other way around.
Want to see the rate you could be offered? Check your eligibility with Prodigy Finance in a few minutes, with no impact on your credit score.
Disclaimer
Loan and promotion offers are subject to our eligibility, funding, and credit assessment criteria. Loan amounts are subject to the cost of attendance limits set by schools.
13.38% APR representative variable, based on a total credit amount of USD 40,000 repayable over 180 months at a variable interest rate of 12.24% (8.60% fixed + 3.64% variable). Administration fee: USD 1,680 (4.2% of the amount borrowed), added to the loan on disbursement and repayable with interest over the term. Processing fee: USD 500, payable before the loan is advanced. Initial monthly repayments of USD 100 (30 Months). Subsequent monthly repayments of USD 625.50 (180 Months). Total interest payable USD 73,910.76. Total amount payable USD 115,590.76.
