Whether a small business loan has a fixed or variable rate depends on the product. SBA 504 loans are always fixed. SBA 7(a) loans can be either, negotiated between you and the lender. Conventional bank term loans are usually fixed, business lines of credit are usually variable, and merchant cash advances skip interest rates entirely in favor of a factor rate. Knowing which structure applies helps you predict your payments and total cost before you sign.
Which Small Business Loans Are Fixed and Which Are Variable
The rate type is baked into the product more than into your negotiation.
SBA 504 loans carry a fixed rate on the debenture portion for the entire term. The rate is set by the SBA, approved by the Secretary of the Treasury, and pegged to an increment above the current market rate for 10-year U.S. Treasury issues. Terms run 10, 20, or 25 years, and the payment on the debenture stays the same across the whole period.1U.S. Small Business Administration. 504 Loans
SBA 7(a) loans can be fixed or variable. That choice gets negotiated between the borrower and the lender, but the total rate cannot exceed SBA-imposed maximums pegged to the prime rate or an optional peg rate.2U.S. Small Business Administration. Terms, Conditions, and Eligibility Fixed-rate 7(a) loans use separate maximums that the SBA publishes periodically in the Federal Register.3eCFR. 13 CFR 120.213 – What Fixed Interest Rates May a Lender Charge If your 7(a) loan is fixed, the payment stays the same for the life of the loan.4U.S. Small Business Administration. 7(a) Loans
Conventional bank term loans outside the SBA programs often carry a fixed rate, which lets you calculate the total borrowing cost before you sign. Fixed pricing is common for equipment purchases, real estate, and expansion projects where a mid-project payment increase would hurt.
Business lines of credit typically carry a variable rate. A line works like a revolving balance: you draw funds as needed and pay interest only on what you use, and the rate moves with the broader lending market. The trade-off for the fluctuating rate is flexibility to borrow and repay on your own schedule.
Merchant cash advances and similar alternative products use a factor rate rather than a fixed or variable interest rate. More on that below, because it changes how you compare costs.
How a Variable Rate Actually Moves
A variable rate has two parts: an index and a margin. The index is a public benchmark that reflects the broader cost of borrowing. The margin (also called a spread) is a fixed percentage your lender sets based on your credit, revenue, and collateral. Add them together and you get your effective rate. The margin stays constant for the life of the loan; only the index moves.
The two benchmarks that matter most for small business loans are the Wall Street Journal Prime Rate and the Secured Overnight Financing Rate (SOFR). The Prime Rate is what banks charge their most creditworthy business customers, and it typically moves in step with the federal funds rate within days of a Federal Reserve change. SBA 7(a) variable-rate loans are pegged to the Prime Rate or an optional peg rate.2U.S. Small Business Administration. Terms, Conditions, and Eligibility SOFR is the U.S. dollar benchmark that replaced LIBOR after LIBOR’s final settings ceased on June 30, 2023.5Alternative Reference Rates Committee. Transition From LIBOR
If your agreed margin is 2% and the Prime Rate is 6.75%, your effective rate is 8.75%. When Prime moves, so does your rate at the next adjustment.
How often can the rate change? That depends on the loan agreement. For SBA 7(a) variable loans, federal regulations prohibit adjustments more frequently than once a month. The first adjustment can occur on the first calendar day of the month after disbursement, using the base rate in effect on the first business day of that month.6eCFR. 13 CFR 120.214 – What Conditions Apply for Variable Interest Rates Other variable loans may adjust monthly, quarterly, or annually. Your note will spell it out.
Many variable loans also include floors and ceilings. A floor sets the minimum rate the lender will charge even if the index collapses. A ceiling caps the maximum rate you will ever pay no matter how high the index climbs. Not every loan has both, so check the agreement before signing.
Factor Rates Are Not Interest Rates
Some online lenders and alternative financing companies price merchant cash advances and similar products using a factor rate: a fixed multiplier applied to the amount you receive. A factor rate of 1.2 on a $10,000 advance means you owe $12,000 total, locked in from day one.
Two things follow. First, the total cost does not move with the market, so a factor rate is not “variable” in the sense a bank loan can be. Second, and more important, a factor rate does not reward early repayment. With a standard interest rate, paying off the balance faster reduces the interest that accrues. With a factor rate, you owe the same flat dollar amount whether you repay in three months or twelve, which pushes the effective annual cost sharply higher on shorter repayment periods.
To compare a factor rate to an APR, calculate the borrowing cost as a percentage of the loan, then annualize it. On a $10,000 advance at a factor rate of 1.3, the payback is $13,000, so the borrowing cost is 30%. Divide 365 by the days in your repayment period and multiply. A 14-month repayment (about 420 days) works out to roughly a 26% APR. Repay the same advance in seven months (about 210 days) and the effective APR is closer to 52%.
Choosing Between Fixed and Variable
The right choice depends on your loan term, cash flow, and view of where rates are headed.
- Longer terms tilt fixed. The more years you borrow across, the more room rates have to move against you. A 20- or 25-year SBA 504 loan removes that uncertainty by design. On a one- or two-year loan, the exposure is smaller.
- Tight cash flow tilts fixed. If your margins are thin or your revenue is seasonal, a predictable payment matters more than a slightly lower starting rate.
- An expectation of falling rates tilts variable. A variable loan lowers your payment automatically when the index drops, without a refinance.
- Fast payoff tilts variable. Variable rates often start lower than fixed rates on the same product because the lender bears less interest-rate risk. If you plan to repay quickly, the lower starting rate can beat a fixed rate even if the index rises modestly.
If you take a variable 7(a) loan and rates later move against you, refinancing existing business debt with a new 7(a) loan is an option, potentially into a fixed rate at that time.2U.S. Small Business Administration. Terms, Conditions, and Eligibility
Prepayment Penalties Depend on the Rate Type
Fixed-rate loans are more likely to carry prepayment penalties because the lender committed to a set return over the full term. Many fixed-rate commercial loans use a yield maintenance formula, which asks you to pay the difference between your loan’s rate and the current market rate on the remaining balance.
SBA 504 loans have a specific, non-negotiable prepayment penalty. On 20- or 25-year loans, the penalty applies for the first ten years and declines by one-tenth each year. On 10-year 504 loans, the penalty period lasts five years. After that, prepayment is free.
Variable-rate loans generally carry lighter penalties or none, because the lender’s return already tracks the market. SBA 7(a) loans may include a prepayment fee depending on the terms you negotiate, so ask before closing.
Factor-rate products are the exception worth flagging. Because the total dollar cost is fixed at signing, paying off a merchant cash advance early does not save you money the way it would on a traditional interest-bearing loan. The full cost is baked in from day one.