Variable interest rate
A variable rate can change over the life of the loan, usually tied to an index like the prime rate. Monthly payment can rise or fall.
Full definition
A variable interest rate adjusts during the loan's life, typically based on an underlying index (such as the U.S. prime rate or SOFR) plus a fixed margin. Borrowers benefit if rates fall and pay more if rates rise. Variable rates are common on HELOCs and credit cards, but uncommon on personal installment loans, which are usually fixed-rate.
- Written by
- Get Advance Loan Editorial Team
- Reviewed by
- Compliance Review
- Published
- January 15, 2026
- Last reviewed
- May 22, 2026
- APR (Annual Percentage Rate)APR is the yearly cost of borrowing, expressed as a percentage of the loan amount. It includes interest plus most lender fees, so it's a more complete measure of cost than the interest rate alone.
- Interest rateThe interest rate is the percentage of the loan balance charged per year as interest, excluding fees. It is a component of, but smaller than, the APR.
- Fixed interest rateA fixed rate stays the same for the entire life of the loan, so the monthly payment never changes. Most U.S. personal loans are fixed-rate.
- Prime rateThe prime rate is the benchmark interest rate U.S. banks publish for their most creditworthy commercial customers. Many consumer rates are quoted as prime + a margin.
- Loan termThe loan term is how long you have to repay the loan, usually expressed in months. Common personal-loan terms are 24, 36, 48, 60, and 72 months.
- PrincipalPrincipal is the original loan amount you borrowed, before interest. Each monthly payment goes partly to principal and partly to interest.
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