For SBA lenders
Short answer
The interest rate cap for a variable rate 7(a) loan is determined by adding the maximum allowable spread to the chosen base rate (e.g., Prime Rate, Term SOFR), and it cannot exceed the SBA's published maximum.
SOP 50 10 establishes maximum interest rates for 7(a) loans, which include a base rate plus a maximum allowable spread. The maximum spread varies by loan size and maturity. This cap ensures that borrowers are not charged excessive rates, aligning with the SBA's mission to provide affordable capital.
A $1,000,000 variable rate 7(a) loan uses the Wall Street Journal Prime Rate. If the maximum permissible spread for this loan size and term is 3.00%, then the interest rate cannot exceed Prime Rate + 3.00%.
Insider move
Lenders must ensure that the interest rate, including the base rate and spread, never exceeds the SBA's maximum allowable cap. Violating the rate cap can lead to a guaranty denial.
13 CFR Part 120 — Business Loans
Office of the Federal Register · Federal regulation
SOP 50 10 - Lender and Development Company Loan Programs
7(a) Alternative Base Rate Options
Last checked 2026-06-13. Official sources control — verify before relying on any rule for a live deal.
Last reviewed 2026-06-13 · SBA sources checked through 2026-06-13. DealRoom analysis of public SBA 7(a) lending records (FY2020–present). Grounded in the current SBA rulebook; verify against the official sources above before relying on it for a live deal. Not legal, tax, or financial advice, and not an approval decision.
More on base rates
Terms in this answer
Pre-qualify your SBA 7(a) deal
Tell us the business, the price, and where you are — we'll point you to the lenders most likely to fund a deal like yours and flag anything that trips up approval.
Free · No documents · Usually same-day