SBA loan basics
Short answer
The Wall Street Journal Prime Rate is the most common base rate for variable interest rates on SBA 7(a) loans. The actual borrower rate is this Prime Rate plus a negotiated spread.
For variable-rate 7(a) loans, the interest rate fluctuates based on changes to an index, with the Wall Street Journal Prime Rate being the most frequently used. The SBA sets maximum allowable spreads that lenders can add to this base rate, depending on the loan size and term.
If the Wall Street Journal Prime Rate is 8.50%, and a lender offers a loan at Prime + 2.50%, the borrower's interest rate would be 11.00%. If Prime then moves to 9.00%, the borrower's rate would become 11.50%.
Insider move
Lenders must clearly define the base rate used (e.g., WSJ Prime, SOFR) and the specific spread in the loan documents. They must also ensure that the total interest rate (base + spread) does not exceed SBA maximums.
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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