Small Business Loan Calculator: How Much Can You Actually Borrow?
TL;DR — Key Facts
- →Lenders size loans on DSCR (Debt Service Coverage Ratio) - minimum 1.25x. At $150K annual net income, maximum debt service is $120K/year, supporting ~$750K in SBA 7(a) debt.
- →SBA 7(a): up to $5M. Revenue-based lenders: typically 1.0-1.5x monthly revenue. Equipment financing: up to 100% of asset value.
- →Credit score gates: SBA preferred lenders require 650+. Revenue-based online lenders approve to 550.
- →Working capital loans are sized on revenue. Acquisition loans are sized on business cash flow. These are different calculations.
Why Most Loan Calculators Give You the Wrong Number
A standard loan payment calculator tells you what a $250,000 loan costs per month at 9% over 10 years: $3,165. That is useful. It is also incomplete - because it answers the wrong question.
The question borrowers actually need answered is: how much will a lender approve for my business? That number depends on cash flow, credit score, time in business, and loan type. None of that goes into a payment calculator.
Lenders use two primary methods to size loans:
DSCR-based sizing (SBA, bank, and acquisition loans) DSCR = Net Operating Income divided by total annual debt service. Most lenders require a minimum of 1.25x, meaning the business must generate $1.25 for every $1.00 of annual debt payments.
If your business generates $150,000 in annual net income after owner compensation, a lender will allow a maximum annual debt payment of $120,000 ($150,000 / 1.25). At 9.5% over 10 years, that supports a loan of approximately $750,000.
Revenue multiple sizing (online lenders and MCAs) Short-term lenders like OnDeck, Bluevine, and Fundbox use revenue multiples: typically 1.0-1.5x monthly gross revenue. On $80,000/month in revenue, that is $80,000-$120,000 in loan capacity. These loans carry 3-24 month terms and higher effective rates than SBA products.
Loan Sizing by Business Profile
The table below shows approximate borrowing capacity by revenue, net income, and credit score. These are estimates based on standard underwriting criteria - actual approval depends on full underwriting of your specific application.
| Annual Revenue | Net Income | Credit Score | SBA 7(a) Approx. Max | Revenue-Based Max | Equipment Max |
|---|---|---|---|---|---|
| $500,000 | $80,000 | 700+ | $400,000 | $50K–$75K | Asset value |
| $1,000,000 | $150,000 | 700+ | $750,000 | $100K–$150K | Asset value |
| $1,000,000 | $150,000 | 620–650 | $500,000 | $100K–$150K | Asset value |
| $2,000,000 | $300,000 | 700+ | $1,500,000 | $200K–$300K | Asset value |
| $500,000 | $80,000 | 550–620 | Not eligible | $50K–$75K | Asset value |
SBA maximums assume 10-year term at 9.5%, 1.25x DSCR. Revenue-based assumes 12-month term at 1.25x monthly revenue.
How Lenders Actually Underwrite Your Application
Most business owners assume loan approval is primarily about credit score. For SBA term loans and bank loans, cash flow is the more important variable.
The five factors lenders weight most heavily:
Cash flow (DSCR): The single most important number for term loans and SBA products. Lenders pull business tax returns and calculate Seller's Discretionary Earnings (SDE) or EBITDA. Strong revenue with thin margins still causes DSCR problems at modest loan sizes.
Time in business: SBA lenders typically require 2+ years of tax returns. Revenue-based lenders require 6-12 months of bank statements. Startups under 6 months have limited options: SBA Microloan program, equipment financing against specific assets, or personal credit.
Credit score: SBA preferred lenders typically require 650+. Some SBA lenders approve to 620 with strong cash flow. Non-bank lenders go to 550 for short-term products at higher rates.
Collateral: SBA loans under $25,000 typically require no collateral. SBA 7(a) loans above $25,000 require available collateral to be pledged - business assets first, then personal real estate if business assets are insufficient. Many SBA loans close undercollateralized when cash flow is strong.
Industry: Certain industries are SBA-ineligible (lending, gambling, speculative investment). Restaurants and retail face more scrutiny due to higher historical failure rates.
Working Capital vs Acquisition: Two Different Calculations
Borrowers searching for a loan calculator often conflate two loan types that use completely different sizing logic.
Working capital loans are sized on monthly revenue. A $500,000/year revenue business can typically access $50,000-$100,000 in working capital credit. Terms run 6-36 months with higher rates. These are not appropriate for financing business acquisitions.
Acquisition and term loans are sized on business cash flow (DSCR). A business generating $250,000 in annual EBITDA can support approximately $1,250,000 in debt at standard SBA terms. These have 5-10 year terms and are appropriate for buying businesses, real estate, or major equipment.
Using working capital loan math to estimate acquisition financing leads buyers to significantly underestimate their borrowing capacity. Using acquisition loan math to estimate working capital needs leads to disappointment when short-term lenders offer far less than expected.
The loan type determines the right calculation, not the other way around.
What Most Loan Calculator Pages Get Wrong
Most loan calculator pages show three inputs: amount, rate, and term. That answers one question - what would I pay monthly if I got this loan? It does not answer what lenders will actually approve.
A second common error: most calculators display APR ranges without tying them to specific borrower profiles. A 550 credit score borrower does not pay the same rate as a 720 credit score borrower. A startup does not pay the same rate as a business with 5 years of audited returns. Rate ranges quoted without credit and time-in-business context are not useful planning tools.
The FundBizPro lending readiness calculator estimates your borrowing capacity by loan type based on your actual revenue, credit score, time in business, and loan purpose.
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This article is for informational purposes only and does not constitute financial, legal, or investment advice - consult a licensed professional before making acquisition or financing decisions.
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Score a franchise location free →By FundBizPro Editorial · Published 2026-05-15 · United States
Written by
FundBizPro Editorial Team
Backgrounds in commercial banking, SBA lending, and franchise industry research
The FundBizPro Editorial Team covers North American franchise costs, FDD analysis, site selection, and acquisition financing. Articles draw on current FDD filings and primary industry sources and are reviewed before publication. Content is educational only and is not a substitute for advice from a licensed professional.
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