1. Enter the financing and ownership cost inputs
The investor mode accepts purchase price, down payment, interest rate, loan term, annual property taxes, annual homeowners insurance, monthly HOA and estimated closing costs.
These inputs determine loan amount, debt service, recurring fixed expenses and the cash-invested denominator used in cash-on-cash return.
2. Enter the rental operating assumptions
The calculator also accepts estimated monthly rent, vacancy percentage, management percentage, maintenance percentage and other monthly expenses.
Rent should come from recent comparable rentals, while vacancy and expense assumptions should reflect the actual strategy and micromarket rather than an optimistic target.
3. Understand how NOI is calculated
Gross scheduled rent is monthly rent multiplied by 12. Effective rental income reduces that figure by the vacancy assumption.
Operating expenses include annual taxes, annual insurance, HOA, other monthly expenses and management plus maintenance percentages applied to effective rental income. NOI equals effective rental income minus those operating expenses.
4. Separate property return from financing return
Cap rate is calculated from NOI divided by purchase price. Debt service is calculated separately from loan amount, interest rate and term.
Annual cash flow equals NOI minus annual debt service. Cash-on-cash return divides annual cash flow by cash invested, where cash invested equals down payment plus estimated closing costs.
5. Use break-even occupancy as a stress signal
The calculator estimates the occupancy needed for rent, after variable expense assumptions, to cover fixed expenses and debt service.
A high break-even occupancy can indicate a thinner margin for error. It should be reviewed together with reserves, capital expenditures, insurance risk, rental restrictions and realistic market demand.
Common questions
Does the calculator estimate market rent automatically?
No. You supply the rent assumption. It should be supported by current comparable rentals.
Does NOI include mortgage payments?
No. The calculator separates operating performance from financing and subtracts debt service when calculating cash flow.
Is the calculator a loan quote or investment guarantee?
No. It is an informational deterministic calculator. Actual financing, expenses, rent and performance must be verified.