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Debt Service Coverage Ratio Calculator

Calculate debt service coverage from net operating income and annual debt service.

DSCR Inputs

Use operating income after normal property operating expenses, before debt service and income taxes. Lender definitions vary.

Results computed instantly — your data never leaves your device.

DSCR Results

Real-Time

Debt service coverage ratio

1.50×

Annual surplus / shortfall

$40,000.00

NOI-based debt-service ceiling

$120,000.00

A ratio of 1.00× means NOI equals annual debt service.

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How to Use the Debt Service Coverage Ratio Calculator

  1. 1

    Enter annual net operating income.

  2. 2

    Enter annual principal and interest debt service.

  3. 3

    Review the coverage ratio and annual surplus or shortfall.

  4. 4

    Use the result as a screening ratio, not as a lender approval decision.

Formula & Mathematical Basis

DSCR = Net operating income ÷ Annual debt service

Variable Key

NOI

Net operating income after modeled operating expenses

Debt service

Annual principal and interest payments used in the scenario

DSCR

Income coverage expressed as a ratio

📝 Lenders may define NOI and debt service differently, include reserves, or require a target coverage level. Confirm the underwriting definition for the specific loan.

Step-by-Step Examples

1

Property coverage example

Scenario: Annual NOI is $120,000 and annual debt service is $80,000.

  1. 1.Divide $120,000 by $80,000.
  2. 2.Read the 1.50× coverage ratio.
  3. 3.Subtract debt service from NOI to find the $40,000 annual surplus.
  4. 4.Stress-test income and expenses before relying on the ratio.
✅ The modeled DSCR is 1.50× with a $40,000 annual operating surplus before other items.

Practical Use Cases

  • Screen a rental or commercial property financing scenario.
  • Compare income coverage across debt structures.
  • Show how vacancy or expense assumptions change coverage.

Common Pitfalls

  • Using gross rent instead of NOI.
  • Leaving replacement reserves or management costs out of expenses.
  • Assuming a ratio alone guarantees approval or a specific interest rate.

Frequently Asked Questions

What does 1.25× mean?

The modeled NOI is 1.25 times annual debt service, leaving a 25% cushion relative to the debt payment.

Does DSCR include taxes?

Definitions vary. This route uses the NOI and debt service values you enter, so label your assumptions consistently.

Is a higher DSCR always better?

Higher coverage generally indicates more modeled income cushion, but lenders also assess leverage, property risk, borrower strength, and documentation.

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