ONEDEAL EDUCATIONAL GUIDE
Editorial standards · Calculation methods
Hypothetical annual NOI-based coverage
- Net operating income
- $19,500
- Required debt service
- $15,000
- Calculation
- $19,500 ÷ $15,000
- Income left before excluded costs
- $4,500
DSCR = 1.30. Coverage is not the same as cash-on-cash return.
Is debt service included in NOI?
No. Calculate property income after vacancy and operating expenses before subtracting principal and interest payments. Debt service belongs below NOI when estimating cash flow and in the denominator when calculating NOI-based DSCR. Subtracting the mortgage payment inside NOI and then dividing by that payment counts the financing burden twice.
With $19,500 annual NOI and $15,000 annual debt service, DSCR is 1.30 and $4,500 remains before costs excluded from NOI. Dividing $4,500 by $15,000 instead would incorrectly report 0.30. Keep reserves consistent: OneDEAL’s model includes the entered capital-reserve allowance in its costs, while a lender may use a different definition.
Follow the rental cash-flow exampleCheck OneDEAL’s NOI and cash-flow assumptions
Keep periods and definitions consistent
Annual NOI divided by annual debt service and monthly NOI divided by monthly debt service give the same ratio when the inputs describe the same period. Mixing annual income with a monthly payment produces a misleading result. Include the relevant required loan payments, not just interest.
At $19,500 NOI and $15,000 annual debt service, the remaining $4,500 is an arithmetic cushion before any expenses excluded from that NOI definition. It is not necessarily spendable profit.
Why a lender may show a different DSCR
Some residential investor-loan programs calculate coverage using rent divided by PITIA: principal, interest, taxes, insurance and association dues. That is different from subtracting operating expenses to calculate NOI and then dividing by debt service. Ask the lender which income, vacancy, expense and reserve assumptions apply.
For example, $2,400 monthly rent divided by $1,800 PITIA gives approximately 1.33. That figure alone says nothing about maintenance or vacancy. OneDEAL's NOI-based model includes a capital-reserve expense; do not assume its result matches a lender's qualifying ratio.
Use coverage alongside cash needs
There is no universal loan approval hidden inside a calculator result. A lender may also consider property eligibility, appraisal, liquidity, credit, loan size and other conditions. Confirm the actual program requirements before making a financing commitment.
- Stress lower collected rent and higher expenses.
- Compare the resulting monthly cash flow with upcoming capital work.
- Review all lender definitions and terms before relying on the ratio.
Further reading: Example of a residential lender's rent-to-PITIA method.
Sources and method
Worked examples use the stated hypothetical assumptions. Source links support the general definitions and rules; they do not verify a specific product, offer or individual outcome.
Examples are educational estimates, not current product offers, approvals or individualized investment, tax, insurance or legal advice. Confirm current terms and rules for your circumstances.