Model an SBA 7(a) loan with live prime-rate pricing: monthly payment, total interest, the SBA guaranty fee, and a rate-shock stress test showing how your payment changes if prime rises. Most 7(a) loans are variable (prime + a spread), so planning for rate moves matters.
Variable-rate amortization
The SBA 7(a) program is the Small Business Administration's flagship loan, used for working capital, equipment, real estate, and business acquisition. Most 7(a) loans carry a variable rate set as the prime rate plus a lender spread, with the spread capped by SBA rules (larger loans get smaller maximum spreads). Because prime moves with the Federal Reserve, your rate — and monthly payment — can rise or fall over the life of the loan, which is why this calculator includes a rate-shock stress test.
The SBA also charges an upfront guaranty fee on the guaranteed portion of the loan, typically scaling from about 0.25% on small loans up to roughly 3.5%–3.75% on larger ones. We price the loan using the live prime rate so your starting payment is realistic, then show what happens if prime climbs 1% or 2%. Stress-testing your payment at higher rates is the single best way to make sure your business can service the debt if the Fed tightens.
Your rate floats with prime. A 2.75% spread on a 7.5% prime is a 10.25% rate — and it moves over time.
An upfront SBA fee on the guaranteed portion, often financed into the loan. Bigger loans pay a higher percentage.
If prime jumps 2%, a variable payment can rise meaningfully. Confirm cash flow can absorb it.
7(a) terms reach 10 years for equipment/working capital and up to 25 years for real estate.
The SBA 7(a) loan is the U.S. Small Business Administration's flagship financing program, funding working capital, equipment, commercial real estate, and business acquisitions nationwide. American entrepreneurs search "SBA 7a loan calculator," "SBA loan rates 2026," and "SBA loan monthly payment" when sizing a deal — and because most 7(a) loans are variable (the prime rate plus a lender spread), the payment can move over time. This calculator uses the live prime rate to estimate your monthly payment, total interest, and SBA guaranty fee.
With a variable SBA loan, a rise in the prime rate raises your payment for the rest of the term. The built-in rate-shock test shows your payment today and at prime +1% and +2%, so you can confirm your cash flow can absorb a tighter Federal Reserve before you sign the note.
A small business borrows $350,000 at prime + 2.75% (about 10.25%) over 10 years. The monthly payment is roughly $4,674. Because the rate is variable, the rate-shock test shows the payment climbing if prime rises 1% or 2% — essential for confirming the business can service the debt through a tighter Federal Reserve.
U.S. small business owners, franchisees, startups, and entrepreneurs using an SBA 7(a) loan for working capital, equipment, commercial real estate, debt refinancing, or buying an existing business.
The SBA 7(a) programme is the US Small Business Administration's main lending vehicle. The SBA does not lend directly — it guarantees a portion of a bank's loan, typically 75–85%, which reduces the lender's risk enough to finance businesses that would otherwise be declined. Rates are capped relative to prime but are usually variable, and a guarantee fee applies on the guaranteed portion. Terms are generous by commercial standards: up to 10 years for working capital and 25 for real estate, which is what makes the payments manageable.
M = P × [ i(1 + i)^n ] ÷ [ (1 + i)^n − 1 ]Guarantee fee = Guaranteed portion × fee rate (tiered by loan size)Maximum rate = prime + allowed spreadDSCR = Net operating income ÷ Annual debt servicewhere:
Assumptions: Most 7(a) loans are variable-rate tied to prime, so payments move with Federal Reserve policy. Personal guarantees are required from owners of 20% or more, and collateral is expected where available.
Compute the payment, the guarantee fee and the cash flow needed to qualify.
Result$4,722.72 a month — plus a $7,875 guarantee fee at closing
Total interest over ten years is $216,727. Because the rate is usually variable, a 2-point rise in prime would lift the payment to about $5,090 — worth stress-testing against cash flow before signing, since the DSCR requirement is measured at origination but the risk persists for a decade.