How to calculate an SBA loan payment (2026)
How SBA loan payments are calculated, with worked 7(a) examples at Prime 7.00%, how term and rate change the payment, fees, and the cash flow lenders need.
Published · 7 min read · By the AceTheSBA team
Key points
- SBA term loans use a standard amortizing payment: the same monthly payment of principal and interest over the term. Variable-rate loans recalculate when the rate adjusts.
- A $500,000 7(a) loan over 10 years at the 10.00% maximum (Prime 7.00% plus 3%) costs about $6,608 a month.
- Term matters more than rate: a $1,000,000 real estate loan at 10% is about $9,087 a month over 25 years and $13,215 over 10 years.
- Lenders divide your cash flow by all annual debt payments. You need at least 1.10 times coverage for 7(a) loans of $350,000 or less and 1.15 times for larger loans.
Before you talk to a lender, you should know roughly what your SBA loan will cost each month and whether your business can carry it. Both come down to a few numbers you can work out yourself.
The payment formula
SBA term loans are fully amortizing: you pay the same amount each month, and each payment covers that month’s interest plus some principal, so the balance reaches zero at the end of the term.
Monthly payment = loan × r ÷ (1 − (1 + r)^−n)
- r = annual interest rate ÷ 12
- n = number of monthly payments (years × 12)
Worked example: $250,000 at 13.00% over 10 years. r = 0.13 ÷ 12 = 0.010833 and n = 120. The payment is about $3,733 a month, or $44,793 a year. Over the full term you pay about $197,900 in interest.
Or skip the arithmetic and use the SBA loan calculator, which applies SBA’s current maximum rates automatically.
Example payments at today’s maximum rates
With Prime at 7.00%, these are the payments at SBA’s maximum variable 7(a) rates:
| Loan | Rate (maximum) | Term | Monthly payment |
|---|---|---|---|
| $40,000 | 13.50% (Prime + 6.5%) | 7 years | about $739 |
| $150,000 | 13.00% (Prime + 6.0%) | 10 years | about $2,240 |
| $300,000 | 11.50% (Prime + 4.5%) | 10 years | about $4,218 |
| $500,000 | 10.00% (Prime + 3.0%) | 10 years | about $6,608 |
| $1,000,000 real estate | 10.00% (Prime + 3.0%) | 25 years | about $9,087 |
Lenders can and often do charge less than the maximum, so treat these as the upper end.
Term changes the payment more than rate
The same $1,000,000 at 10.00% costs about $13,215 a month over 10 years and about $9,087 over 25 years. The longer term cuts the payment by about 31%, but total interest rises from about $586,000 to about $1,726,000.
SBA sets the maximum term by what the loan buys: up to 10 years for working capital, inventory and goodwill, generally 10 years for equipment, and up to 25 years for real estate. A loan with mixed uses gets a blended term.
Variable rates: the payment can change
Most 7(a) loans have a variable rate tied to Prime. When the rate adjusts, the payment is recalculated over the remaining term. On the $500,000, 10-year example, a 1-point rise in the rate at the start of the loan adds about $280 a month. Test your budget at a rate at least one point higher than today’s.
Do not forget the fees
- SBA guaranty fee: up to 3% of the guaranteed portion for loans of $150,001 to $700,000. On a $500,000 loan with a 75% guarantee, that is up to $11,250, which you may finance.
- Lender packaging fee and closing costs: appraisals, title and legal fees
If you finance the fees, add them to the loan amount before calculating the payment.
Can your business afford it? The coverage test
Lenders do not only ask whether you can make the payment. They ask whether cash flow covers all business debt payments with a cushion. That is the debt service coverage ratio (DSCR):
DSCR = annual cash flow available for debt service ÷ annual payments on all business debt
SOP 50 10 8.1 minimums:
- 1.10 for 7(a) loans of $350,000 or less
- 1.15 for 7(a) loans over $350,000, and for projections within 2 years
- 1.25 for most business purchases
Example: the $500,000 loan costs about $79,290 a year. With no other debt, the business needs cash flow of at least $91,200 (1.15 × $79,290). If it also pays $20,000 a year on an equipment loan, it needs about $114,200.
Quick checklist before you apply
- Calculate the payment at the maximum rate and at one point higher.
- Add every other business debt payment.
- Divide your cash flow by the total, and check you clear the minimum.
- If you fall short, consider a longer term (where the use allows), a smaller loan or more equity.
This article reflects SBA SOP 50 10 8.1, effective October 1, 2026, and the Wall Street Journal Prime rate of 7.00% (November 2026). Payments are estimates.