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Business Loan Calculator

Taking on debt to grow a business only makes financial sense if the returns on that capital outpace the cost of borrowing. Before signing a loan agreement, you need to know your monthly payment, how much total interest you will pay over the life of the loan, and how the numbers change when you adjust the rate, term, or amount. This calculator uses the standard amortization formula to compute monthly payments and total interest for any business loan — whether you are comparing SBA 7(a) options, a bank term loan, or equipment financing.

How Business Loan Payments Are Calculated

Business loans use standard amortizing payment math:

Monthly Payment = P x [r(1+r)^n] / [(1+r)^n - 1]

Where:

• P = loan principal (amount borrowed)
• r = monthly interest rate (annual rate / 12)
• n = total number of monthly payments (years x 12)

Total Interest = (Monthly Payment x n) - Loan Amount

Total Repayment = Loan Amount + Total Interest

Debt Service Coverage Ratio (DSCR) = Annual Net Operating Income / Annual Debt Service. Lenders typically require a minimum DSCR of 1.25x, meaning your business earns at least 25% more than the payment requires.

Worked Examples

Example 1 — Equipment purchase, $75,000 at 8.5%, 5 years: Monthly payment: $1,539. Total interest: $17,340. Total repaid: $92,340. To qualify, the business would need annual net operating income of at least $23,068 (DSCR of 1.25x on the $18,468 annual debt service).

Example 2 — SBA 7(a) working capital, $200,000 at 9.5%, 10 years: Monthly payment: $2,585. Total interest: $110,200. Total repaid: $310,200. The same $200,000 over 7 years at the same rate would cost $3,170/month but only $66,228 in total interest — saving $43,972 by accepting a higher monthly payment.

Example 3 — Commercial real estate, $500,000 at 7%, 25 years: Monthly payment: $3,533. Total interest: $559,900. Total repaid: $1,059,900. Despite the low rate, the 25-year term results in the business paying more in interest than the original loan amount. A 15-year term at the same rate would cost $4,494/month but save $253,620 in total interest.

Business Loan Rate and Term Reference Table

When to Use This Calculator

• When comparing two or more loan offers with different rates and terms, to see which option costs less over the full repayment period
• Before applying, to calculate the minimum revenue needed to meet a lender’s 1.25x DSCR requirement and confirm your business qualifies
• When deciding between a shorter term (higher payment, less total interest) versus a longer term (lower payment, more total interest) based on your cash flow situation
• When projecting a business acquisition price, to determine how much of the purchase can be financed while keeping debt service manageable
• When considering prepaying a loan early, to calculate how much interest you would save versus investing those funds elsewhere

Common Mistakes

1. Comparing monthly payments instead of total cost. A $50,000 loan at 12% over 3 years costs $19,559 in interest. The same loan at 9% over 5 years costs $12,371 in total interest but $4,226 more in the extra two years of payments — the longer loan actually costs less in interest but ties up cash flow longer. Always compare total repayment cost, not just the monthly figure.
2. Ignoring loan fees in the true cost. SBA guarantee fees range from 0% to 3.5% of the guaranteed portion, origination fees run 1-5% of the loan, and some lenders charge prepayment penalties. A $200,000 loan with a 3% origination fee costs an additional $6,000 upfront, which must factor into the comparison with other offers.
3. Borrowing against personal assets without stress-testing. Most small business loans require a personal guarantee. Before pledging your home as collateral, model what happens if revenue drops 30% — can you still make payments? If not, evaluate unsecured options or reduce the loan amount to a level your business can service in a downturn.
4. Skipping the DSCR calculation. Lenders will calculate your DSCR whether you do or not. Going into a meeting without knowing your number wastes time and risks rejection. Calculate it before you apply: if your DSCR is below 1.25x, either reduce the loan amount, extend the term to lower monthly payments, or build revenue before applying.

Current Context for 2026

Business loan rates in 2026 reflect the Federal Reserve’s rate environment following the aggressive rate increases of 2022-2023. The Fed Funds rate stabilized and saw modest cuts in 2024-2025, bringing SBA 7(a) rates from their 2023 peak of 11.5-13.5% down to a more moderate 8.5-11% range. Equipment financing and bank term loans have followed a similar trajectory. Businesses that locked in floating-rate SBA loans at peak rates and are now eligible to refinance may find meaningful savings by doing so. The SBA loan approval environment remains active — the SBA approved over $36 billion in 7(a) loans in FY2024, and demand for SBA 504 real estate loans remains strong as commercial property prices hold at elevated levels.

Tips

1. Always get quotes from at least three lenders — a bank, a credit union, and one online lender — since rates and fees vary significantly and there is no single “market rate” for small business loans.
2. Evaluate total cost of capital (all principal + interest + fees), not the APR or monthly payment alone; a lower APR with high origination fees can cost more than a slightly higher APR with no fees on short-term loans.
3. Build a 13-week cash flow forecast before applying to demonstrate to lenders that you understand your working capital cycle and can service debt through both busy and slow periods.
4. For equipment purchases, compare equipment financing (where the equipment is collateral) against a general SBA 7(a) loan — equipment financing usually closes faster and requires less documentation.
5. If your personal credit score is below 680, focus on SBA microloans (up to $50,000 through nonprofit intermediaries) or CDFI loans, which use different underwriting criteria and serve businesses that do not qualify for conventional bank loans.
6. Consider the prepayment terms carefully — some lenders charge 1-5% penalties for early payoff, which eliminates the interest savings of paying ahead of schedule.

Related Calculations

• Tax Calculator — business loan interest is deductible; model the after-tax cost of borrowing
• Salary Calculator — factor loan payments into owner compensation planning
• All Tax & Business Calculators — explore profit margin, ROI, and other tools to evaluate whether debt-funded growth makes financial sense