Debt Service Coverage Ratio Calculator

What this DSCR calculator does

The Debt Service Coverage Ratio (DSCR) measures whether a property or business generates enough income to cover its debt payments — it's the single most-checked number when a lender underwrites a commercial mortgage, an SBA loan, or a rental-property loan. This tool calculates your DSCR and your cash flow after debt service from gross income, operating expenses, and annual debt payments, rates your coverage, and shows how you compare against the guideline minimums used by five common loan programs.

How to use it

Enter your gross annual income and annual operating expenses (used to derive Net Operating Income), then your annual principal and interest payments. The result updates as you type: a summary with your DSCR, a rating, and your cash flow after debt service, plus a comparison table against five common lender DSCR minimums — with the exact NOI increase needed to clear each one, if you fall short.

How DSCR is calculated

Net Operating Income (NOI) = Gross Annual Income − Annual Operating Expenses
Total Annual Debt Service   = Annual Principal + Annual Interest
DSCR                        = Net Operating Income ÷ Total Annual Debt Service
Cash Flow After Debt Service = Net Operating Income − Total Annual Debt Service

A DSCR of 1.00x means income exactly covers debt payments with nothing left over. Above 1.00x means positive cash flow after debt service; below 1.00x means the income doesn't fully cover the debt, and the shortfall has to come from somewhere else.

DSCR rating scale

• Strong — 1.50x or higher
• Acceptable — 1.25x to 1.49x
• Marginal — 1.15x to 1.24x
• Weak — 1.00x to 1.14x
• Insufficient — under 1.00x

Lender threshold guidelines

The comparison table shows commonly published minimum DSCR figures for SBA 7(a), conventional commercial mortgage, multifamily/apartment, CMBS, and construction loans, and — if your current DSCR falls short of a program's guideline — the exact amount of additional NOI you'd need to meet it.

These are general guidelines, not guarantees. Actual DSCR requirements vary by lender, property type, loan-to-value, borrower credit, and market conditions — some lenders require higher minimums for riskier property types, and some approve lower ratios for strong borrowers. Treat the comparison table as a starting point for the conversation with a lender, not a final answer.

Frequently asked questions

What counts as an operating expense? Recurring costs of running the property or business — maintenance, management fees, insurance, property taxes, utilities — but not debt payments, depreciation, or capital expenditures. Debt service is accounted for separately in the denominator.

Why is my DSCR different from what my lender calculated? Lenders sometimes adjust NOI (adding back certain non-cash expenses, excluding one-time income) or use trailing-twelve-month figures instead of a projection. This calculator uses the standard textbook definition; treat any discrepancy as a reason to ask your lender exactly how they computed theirs.

Does a DSCR under 1.00x always mean the loan gets declined? Not automatically — a borrower with strong reserves, other income sources, or a compelling growth story can sometimes still qualify. But most conventional underwriting treats sub-1.00x DSCR as a hard flag requiring justification.

I want to check my personal (not business) debt load — is this the right tool? No — DSCR is a business/property income-coverage metric. For a personal debt-to-income comparison, use the Debt-to-Income Ratio Calculator instead.

Privacy

Everything runs in your browser. Your income and debt figures are never uploaded or stored.