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Rental Income & Loan Debt Coverage Ratio

Estimate rental operating income and debt coverage from vacancy, expenses and a fixed monthly loan payment.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

Rent of 2,000 with no vacancy and expenses of 25 percent leaves 1,500 operating income. A monthly loan payment of 1,000 gives debt coverage of 1.5 times.

NOI = gross rent × (1 − vacancy share) × (1 − expense share); coverage = NOI/debt payment for the same period

Worked example

Enter these known values and leave the other values blank.

Annual nominal loan interest rate
0 %/yr
Modeled loan term
1 yrs
Financed loan principal
12000 USD
Gross rent before vacancy
2000 USD / mos
Vacancy share of gross rent
0 %
Expenses as a share after vacancy
25 %
Scheduled debt payment
1000 USD / mos
Modeled net operating income
1500 USD / mos
Debt coverage multiple
1.5 ×

Assumptions and limitations

  • The model uses a fixed nonnegative nominal rate, equal end-of-period payments and no extra payments, balloon balance, fees or missed payments.
  • At zero interest, principal equals payment times the number of periods. A positive financed balance needs a payment above periodic interest to amortize in finite time.
  • Whole payment counts describe an equal-payment schedule. Fractional terms are continuous mathematical estimates, not exact calendar payoff dates or final partial bills.
  • The calculator retains internal precision. Contractual rounding, daily accrual and irregular dates can change an actual repayment schedule.
  • Income and debt service are converted to the same monthly basis. Period selectors may display annual figures; changing a display period does not change the coverage multiple.
  • Operating expenses are a percentage of rent remaining after vacancy, not a percentage of gross scheduled rent. Vacancy and expense shares range from zero to 100 percent.
  • This simplified operating-income ratio does not reproduce lender-specific net cash flow, reserves, stress rates, mezzanine debt or underwriting adjustments. It does not establish loan eligibility.

Common questions

What does a ratio of 1.5 mean?

Modeled operating income is one and a half times the scheduled debt payment for the same period. It is not a guarantee of actual cash available or lender acceptance.

Are expenses deducted before or after vacancy?

After vacancy in this model. For 2,000 gross rent, 10 percent vacancy and 25 percent expenses, NOI is 2,000 × 0.90 × 0.75 = 1,350.

References

Bookify explicitly handles zero interest in the payment equation and every retained inverse. Bookify requires the monthly loan payment to exceed monthly interest for a positive financed balance.

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