SBA loan basics
Short answer
The Prime Rate is a benchmark interest rate used by banks, while an SBA loan interest rate is typically the Prime Rate *plus* an additional amount (called a spread or margin).
The Prime Rate is a widely published interest rate that commercial banks charge their most creditworthy corporate customers. For SBA 7(a) loans, the Prime Rate often serves as the "base rate." The lender then adds a "spread" or "margin" to this base rate, reflecting the perceived risk of the borrower and the cost of originating and servicing the loan, all within SBA-mandated caps.
If the Prime Rate is 8.50%, and a lender's spread for a specific loan is 2.50%, the borrower's SBA 7(a) loan interest rate would be 11.00% (8.50% + 2.50%).
13 CFR Part 120 — Business Loans
Office of the Federal Register · Federal regulation
7(a) Loan Program — Terms, Conditions, and Eligibility
U.S. Small Business Administration · Official SBA source
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.
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