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Debt Service Coverage Ratio Calculator

Annualize one source-labelled cash-flow amount and one source-labelled debt-service amount for the same record scope, then divide them without a lender threshold or approval conclusion.

Use this result well

Inputs that matter
One currency and property/loan record scope; a signed cash-flow amount with its controlling source basis and monthly or annual period; and a positive debt-service amount with its controlling source basis and period
Output to expect
A source-preserving annualized cash-flow record, annualized debt-service record, signed difference and entered cash-flow-to-debt-service ratio
How it works
Annualize each entered amount independently, subtract debt service from cash flow for the displayed difference, and divide cash flow by positive debt service; no NOI, payment component, threshold, stress, sizing or approval assumption is generated
  • Reconcile the exact property or collateral scope, cash-flow definition, debt-service components, record dates, periods, loan documents, covenants, amortization and any mezzanine or preferred-equity requirements before comparing records.
  • Use the lender and qualified underwriting, accounting, legal, appraisal and investment review for thresholds, creditworthiness, equity, collateral, guarantees, stress testing, loan sizing and approval; this arithmetic decides none of them.

Choose your path

Built around the job you need to finish

Compare one source- and period-labelled signed cash-flow record with one positive source- and period-labelled debt-service record for the same property or loan scope without a threshold, grade or approval conclusion.

Borrower reading an underwriting worksheet

Keep underwritten net cash flow distinct from generic NOI or gross rent.

Name the property/loan scope, select underwritten NCF and enter the exact amount and period from the worksheet.

Gets transparent annualization and ratio without a fabricated lender minimum or approval signal.

Servicer reviewing monitored performance

Align a trailing cash-flow record with the exact required-payment record and period.

Select monitored trailing cash flow and required payments, then create a separate run when either source definition changes.

Preserves both bases, periods and the signed difference for reconciliation against controlling documents.

Analyst comparing a downside record

Keep negative cash flow visible without turning arithmetic into denial, default or refinance advice.

Enter the signed reviewed cash-flow record and a positive matching debt-service amount for the same scope.

Sees a negative ratio and difference while lender policy, stress testing and decisions remain outside the tool.

Authoritative checks for this tool

Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.

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Reference & details

How it works

Preserve the cash-flow definition

Choose an underwritten net-cash-flow record, monitored trailing record or another documented definition. Signed amounts remain visible; the tool does not convert rent or generic NOI into lender cash flow.

Annualized entered cash flow = monthly amount × 12 or annual amount × 1

Preserve the debt-service definition

Use the controlling required-payment or underwritten debt-service record. Principal, interest, mezzanine, preferred-equity and other required items are included only when that source says so.

Annualized entered debt service = monthly amount × 12 or annual amount × 1

Report arithmetic without a threshold

The denominator must be positive. The ratio and annual difference belong only to the selected records and do not establish a covenant, lender minimum, risk grade or approval outcome.

Entered ratio = annualized cash flow ÷ annualized debt service

Updated: August 2026

Example Scenarios

USD 72,000 annual underwritten NCF divided by USD 54,000 annual required payments equals 1.33, with an USD 18,000 entered-record difference. No threshold or approval label is attached.

When both records are monthly, each is multiplied by exactly 12 before division. Confirm they use the same property/loan scope and controlling definitions.

A negative entered cash-flow amount produces a negative ratio and difference. The page preserves the record without inferring default, denial, required equity or a refinance action.

Common Mistakes to Avoid

Mixing a trailing numerator with a projected or differently scoped denominator

Name the shared property/loan scope, select both source definitions and align their periods before comparing them.

Treating a generic ratio as a lender covenant or approval result

Reconcile the controlling documents, lender policy, payment components and full underwriting file; this calculator reports entered-record arithmetic only.

FAQ

Use the exact covenant, product guide and lender policy for the transaction. OCC guidance explains that an appropriate ratio depends on factors including amortization and cash-flow volatility; this calculator sets no universal threshold.

Only if the controlling definition explicitly uses that amount. Fannie Mae's multifamily definition references defined Net Cash Flow, and other lenders or agreements may use different calculations.

No. Underwriting also considers documentation, borrower creditworthiness, equity, collateral, covenants, repayment sources, guarantees, stress testing and lender policy.

Copy the exact definition from the controlling record. Some definitions include more than principal and interest, so the calculator never supplies missing payment components.

Yes, as separate labelled runs with matching numerator and denominator periods and definitions. This page does not generate projections, interest-rate shocks or approval decisions.

About Debt Service Coverage Ratio Calculator

Name the exact property, collateral pool or loan record, then select the controlling cash-flow and debt-service definitions, amounts and monthly or annual periods. The calculator annualizes each entered record, reports their difference and divides cash flow by debt service. It does not construct NOI or net cash flow, decide which payment components belong in debt service, apply a lender covenant or minimum, size a loan, stress a refinance, grade the result or predict approval.