The prime rate is a bank-set base rate used to price some variable-rate business and consumer credit.
The prime rate is a base lending rate set by a bank and used as a reference for pricing some variable-rate business and consumer credit. A loan quoted at “prime plus 2%” uses the specified prime rate as its base and adds a contractual margin; prime is not necessarily the rate the borrower actually pays.
A variable-rate agreement normally combines:
The resulting contract rate can change automatically when the specified prime rate changes, without a new loan negotiation.
A business line of credit is priced at prime plus 2.00%. If the contract’s prime reference is 7.00%, the borrowing rate is 9.00%.
If the reference later falls to 6.50%, the rate would ordinarily reset to 8.50% under a straightforward formula. A 7.00% contractual floor would not affect that example because 8.50% remains above the floor. The borrower must still check the observation date, reset lag, day-count convention, and fees.
The example illustrates mechanics only. It does not describe a current market quote or predict future rates.
The Federal Reserve’s H.15 release reports a U.S. bank prime loan rate posted by a majority of the 25 largest insured U.S.-chartered commercial banks by domestic-office assets. The release describes prime as one of several base rates banks use to price short-term business loans.
The Wall Street Journal prime rate is another widely referenced published U.S. prime-rate label. When a contract names that source, the named publication and contract language control. Do not silently substitute a bank’s internal prime rate, a Federal Reserve series, or another published prime rate merely because the values often match.
| Rate | What it represents | Typical role |
|---|---|---|
| Prime rate | Bank-set customer lending base rate | Business lines, credit cards, and some consumer credit |
| Fed Funds Rate | U.S. overnight interbank policy-linked rate | Monetary-policy implementation and bank funding conditions |
| SOFR | Broad secured overnight financing benchmark | Floating-rate loans, notes, derivatives, and valuation |
| Fixed loan rate | Contract rate that remains fixed for a defined period | Predictable payment or interest calculation |
Prime is borrower-facing but not borrower-specific. The margin and other loan terms translate that base rate into the actual price of credit.
Prime-based contracts transmit changes in the reference rate into borrowing costs. That can affect:
Analysts should model the contractual borrowing rate, not prime by itself. A loan at prime plus 4% and a loan at prime minus 0.5% have very different economics even though they share a base rate.
This article provides general financial education, not personalized borrowing, investment, legal, or accounting advice. The applicable rate depends on the agreement, source, date, borrower, product, and jurisdiction.