Fixed vs variable interest rate.
A fixed rate stays the same from the first payment to the last. A variable rate can change with the market, typically tracking the U.S. prime rate plus a margin. Each comes with a predictable trade-off between certainty and potential savings.
Fixed rate vs Variable rate
| Attribute | Fixed rate | Variable rate |
|---|---|---|
| Rate behaviour | Stays constant for life of loan | Adjusts periodically with a benchmark (prime, SOFR) |
| Monthly payment | Same every month | Can rise or fall over time |
| Starting rate | Usually slightly higher than initial variable rate | Often lower at origination |
| Best in a rising-rate environment | Yes, you're insulated from increases | No, your payment grows |
| Best in a falling-rate environment | No, you'd need to refinance to capture the lower rate | Yes, payment shrinks automatically |
| Common products | Personal loans, auto loans, fixed mortgages | HELOCs, credit cards, adjustable-rate mortgages |
| Predictability | Total interest known at signing | Total interest depends on rate path |
Which wins, when.
- 01
Standard personal loan
Winner: Fixed rate
Personal loans are almost always fixed. Take the certainty; it's why the product exists.
- 02
Short-term borrowing during stable or falling-rate periods
Winner: Variable rate
If repayment is short and you're confident rates won't rise, a lower starting variable rate can win.
- 03
Risk-averse borrower or fixed budget
Winner: Fixed rate
Fixed rate matches a fixed monthly budget. No surprise payment increases ever.
- 04
Refinancing flexibility matters more than predictability
Winner: Variable rate
Variable rates often have lower prepayment friction, making refinancing easier if rates move.
Frequently asked.
Are personal loans usually fixed or variable?+
Fixed. The U.S. personal-loan market is dominated by fixed-rate installment loans. Variable-rate personal loans exist but are uncommon. HELOCs, credit cards, and adjustable-rate mortgages are the main variable-rate consumer products.
What index do variable rates use?+
Most U.S. consumer variable rates track the prime rate or SOFR (Secured Overnight Financing Rate, which replaced LIBOR). The lender adds a margin (e.g., prime + 4%) that depends on the borrower's credit and the product.
How often does a variable rate change?+
Depends on the product. Credit cards reprice monthly with the prime rate. HELOCs typically reprice monthly. Adjustable-rate mortgages adjust on a defined schedule (usually after a fixed intro period of 5, 7, or 10 years, then annually).
Can I switch from variable to fixed?+
Indirectly, by refinancing into a fixed-rate product. Some HELOCs offer a 'fix-the-rate' option that converts a portion of the outstanding balance to a fixed instalment within the same account.