Business Loan Affordability Calculator (2026)

Business Loan Affordability Calculator

Estimate the business borrowing your cash flow supports, using debt-service logic lenders apply to small businesses.

Short answer

Business Loan Affordability Calculator

$286,975Affordable price

Lenders usually cap total debt near 36% of gross income. That leaves $4,200 a month, which borrows about $256,975 — $286,975 with your $30,000 down.

How it's calculated: $4,200 a month at 9.5% over 7 years Adjust the inputs below to recalculate for your own numbers.

Affordability formula

Business lending is sized on cash flow rather than revenue, so the number that matters is what is left after every other obligation is paid. The calculator applies this formula to your own numbers so the answer reflects your situation rather than a generic example.

Max payment = min(36% × monthly income − debts, 28% × monthly income); Loan = payment × [(1 − (1 + i)^−n) ÷ i]; Price = loan + down payment

Model

Debt-to-income affordability model

Planning benchmark

Lenders typically want a debt service coverage ratio of 1.25 or better

Updated

2026

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  data-calculator="business-loan-affordability-calculator"
  data-title="Business Loan Affordability Calculator"
  data-query="annualIncome=240000&monthlyDebt=3000&downPayment=30000&interestRate=9.5&termYears=7"></script>

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Why the business loan affordability calculator matters

Business lending is sized on cash flow rather than revenue, so the number that matters is what is left after every other obligation is paid. This page turns that decision into a handful of inputs you can defend in a budget review: volume, unit cost, rate of adoption, and time. The output is a planning baseline, not a promise — it tells you whether the idea deserves a vendor quote, a pilot, or a pass.

• Biggest swing factor: annual cash flow available for debt service
• Second-order factor: existing debt payments
• Often ignored: the rate and term on the new facility

What actually changes the answer

annual cash flow available for debt service moves this number first, then existing debt payments. Run a conservative case and an upside case before you commit. If the maths only works in the upside case, treat it as a time-boxed test with a kill date rather than a line in next year's plan.

What to do with the result

Leave at least 25% headroom above the calculated payment. Lenders call it coverage; you will call it survival.

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FAQ

What does the business loan affordability calculator work out?

It applies Max payment = min(36% × monthly income − debts, 28% × monthly income); Loan = payment × [(1 − (1 + i)^−n) ÷ i]; Price = loan + down payment to the values you enter for annual cash flow available for debt service, existing monthly debt payments, cash injection / equity contribution, interest rate, loan term (years). Business lending is sized on cash flow rather than revenue, so the number that matters is what is left after every other obligation is paid.

How accurate is this business loan affordability calculator?

Consumer ratios applied to business income. SBA and commercial underwriting use DSCR, collateral and personal guarantees. Replace the defaults with your own invoice, usage export, payroll data, statement, or vendor quote before making a commitment — the maths is exact, so the answer is only as good as the inputs you feed it.

Which input should I stress-test first?

annual cash flow available for debt service. Re-run with a pessimistic value for it; if the decision flips, that assumption is the thing you need real data on before signing anything. After that, check existing debt payments and the rate and term on the new facility.

Which scenario should I start from?

Start with the preset closest to your situation — cautious budget, today's numbers, stronger position — then edit the sliders. Presets are realistic starting points, not benchmarks to match, and every change updates the result instantly.

What should I do after running the numbers?

Leave at least 25% headroom above the calculated payment. Lenders call it coverage; you will call it survival. A useful planning benchmark to compare against: Lenders typically want a debt service coverage ratio of 1.25 or better.

Can I share or save this calculation?

Yes. Your inputs are written into the page URL, so copying the link shares the exact scenario you are looking at — the person who opens it sees the same numbers. You can also export the inputs and results to CSV or PDF from the result card and keep it with the rest of your workings.

How this calculator is built

Independently maintained

Written by Sam Doshi and the RevenueLab editorial team. We don't sell the data feeds this tool is built on.

Sourced from primary data

Benchmarks come from public AdSense / Stripe / IRS disclosures and reader-submitted data — never third-party "$X per view" claims. Full methodology.

Last editorial review

Reviewed on a rolling quarterly cycle. Dated reviews are published on the methodology record for each calculator.

Editorial standards

See our editorial policy and disclaimer. Results are estimates, not advice.