Finance term
Fixed vs Variable Interest Rate
Also known as: fixed rate, variable rate, adjustable rate, floating rate
Definition
A fixed interest rate stays the same for the entire loan term, making payments predictable. A variable rate adjusts periodically based on a benchmark index (Prime Rate or SOFR), causing payments to fluctuate.
Detailed explanation
Fixed and variable interest rates represent the two fundamental pricing structures in lending — for business credit as well as consumer products like personal loans and mortgages. With a fixed rate, the rate set at origination never changes — every payment is identical, and you know the exact total cost of borrowing before you sign. Most bank business term loans and SBA 504 loans use fixed rates.
Variable rates (also called floating or adjustable rates) are tied to a benchmark index — historically the Prime Rate, now increasingly SOFR (Secured Overnight Financing Rate, the LIBOR replacement). The lender adds a margin — for example, 'Prime + 2.5%' — and the total rate adjusts when the index moves, typically quarterly or annually. SBA 7(a) loans and most business lines of credit use variable pricing.
For borrowers, the tradeoff is certainty vs flexibility. Fixed rates eliminate rate risk and simplify cash-flow planning. Variable rates often start lower (the yield curve prices in a premium for certainty), can decrease if benchmark rates fall, and are common on shorter-term products where rate swings matter less. Businesses with tight margins and predictable revenue typically prefer fixed. Businesses with flexible cash flow and shorter draw-down needs often accept variable.
The Federal Reserve sets the federal funds rate, which indirectly drives Prime (typically Prime = fed funds + 3%). When the Fed tightens, variable-rate borrowers feel it immediately. Monitoring the FOMC outlook matters if your credit facility is variable.
◈ Worked example
- SBA 7(a) variable rate: Prime (8.50%) + 2.75% margin = 11.25% — if Prime drops to 7.50%, rate falls to 10.25%
- SBA 504 fixed rate: 6.8% fixed for 20 years — payments never change regardless of rate environment
- Business line of credit at Prime + 1.5%: borrowing cost rises or falls each quarter with Prime
- Bank term loan at 7.25% fixed over 5 years: total interest cost known at closing
Common questions
The most-asked questions about Fixed vs Variable Interest Rate — answered straightforwardly.
Is a variable rate always riskier than a fixed rate? +
Not necessarily. Variable rates can be advantageous when benchmark rates are high and expected to fall — borrowers benefit from decreasing payments without refinancing. Risk depends on your business's ability to absorb payment changes. Tight-margin businesses with fixed overhead typically prefer the certainty of fixed; flexible businesses may prefer variable.
What replaced LIBOR for variable-rate business loans? +
SOFR (Secured Overnight Financing Rate), administered by the New York Federal Reserve, replaced USD LIBOR after June 30, 2023. New variable-rate loan contracts in the U.S. now reference SOFR rather than LIBOR. Some older contracts were transitioned to SOFR under the LIBOR Act (federal law enacted 2022).
Can I switch from variable to fixed mid-loan? +
Generally no — the rate structure is set in the loan agreement. Converting requires refinancing into a new loan. Some commercial lenders offer rate-lock or conversion options for a fee, but these are non-standard. Review the loan agreement for any conversion provisions before signing.
How does Prime Rate change? +
The Prime Rate is set by major U.S. commercial banks and tracks the federal funds rate — typically Prime = federal funds target rate + 3%. When the Federal Reserve's FOMC raises or lowers the federal funds rate, Prime follows within days. Variable-rate loans tied to Prime reprice accordingly.
Do SBA 7(a) loans always have variable rates? +
Most SBA 7(a) loans are variable-rate, but SBA rules permit fixed rates in some circumstances. For loans of $50,000 or more, lenders may offer fixed rates if they choose. The SBA sets maximum allowable spreads over Prime for variable-rate 7(a) loans. Check current SBA guidelines at sba.gov for the latest rate caps.
Are personal loans fixed or variable rate? +
The overwhelming majority of U.S. personal loans carry a fixed rate — the rate and monthly payment are set at origination and never change for the life of the loan. That's the main reason borrowers choose a personal loan over a variable-rate product like a HELOC or a credit card: payment certainty. Variable-rate personal loans exist but are uncommon among direct-to-consumer lenders, most of which price fixed-rate installment loans exclusively.
Further reading
This glossary entry is educational content. ClearValue Lending is a business & personal financing platform — not a lender, broker, or financial advisor. Specific product terms vary by lender; verify with the lender or issuer before applying. See privacy policy.
https://clearvaluelending.com/glossary/fixed-vs-variable-interest-rate