SBA loan basics
Short answer
SBA 7(a) loan interest rates are primarily determined by a base rate (like the Prime Rate) plus a fixed margin, both subject to caps set by the SBA.
The SBA sets maximum allowable interest rates for 7(a) loans, which are generally calculated as a base rate (e.g., Wall Street Journal Prime, Term SOFR, or SBA Peg Rate) plus a spread (also known as the lender's margin or mark-up). The spread is capped based on the loan size and term. This structure provides flexibility while limiting borrower costs.
If the Prime Rate is 8.50%, a lender might offer an SBA 7(a) loan at Prime + 2.75%, resulting in a total rate of 11.25%. This rate is reviewed for compliance with SBA maximums.
Insider move
Lenders must strictly adhere to the SBA's maximum allowable interest rates. They determine the specific spread based on their internal risk assessment of the borrower, market conditions, and their cost of funds.
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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