Rental Property Owner Cash Flow Calculator

How rental property cash flow is calculated

Cash flow on a rental property is the dollar amount left over after every expense and debt payment has been made. The full math: gross rent (plus other income) minus vacancy minus operating expenses (tax, insurance, maintenance, management fee) minus debt service. Multiply by 12 for the annual number. Divide annual cash flow by total cash invested to get cash-on-cash return.

What's a good cash-on-cash return

For residential buy-and-hold rentals, 8 to 12 percent is a common target range. Below 6 percent is modest and only makes sense when the long-term return (appreciation, principal paydown, tax benefits) carries the deal. Above 12 percent often signals either a high-yield market or an unusually strong acquisition. Above 15 percent should be scrutinized for whether the maintenance and vacancy assumptions are realistic.

Understanding the expense ratio

Operating expenses (excluding debt service) as a percentage of gross rent is the expense ratio. For SFR rentals, 35 to 50 percent is typical. Older properties tilt to the higher end. Newer or well-maintained properties land at the lower end. A 50 percent expense ratio aligns with the "50% rule" rule of thumb used by many investors as a quick screen.

NARPM Trust Accounting context

The math here aligns with how professional property managers prepare owner-facing cash flow statements under the NARPM Accounting Standards (NAS). NAS-compliant statements separate operating income from operating expenses, allocate management fees explicitly, and present cash flow as a clean monthly number. Reporting this way builds owner trust and supports audit-ready bookkeeping.

How to use this calculator

Enter monthly rent, vacancy rate, other income, annual property tax and insurance, annual maintenance budget, the property management fee percentage, monthly mortgage payment, and total cash invested at purchase. The calculator returns monthly cash flow, cash-on-cash return, annual NOI, and the expense ratio.

Frequently asked questions

How do you calculate rental property cash flow?

Cash flow equals effective rent (gross rent times (1 minus vacancy)) plus other income, minus operating expenses (tax, insurance, maintenance, management fee), minus debt service. Multiply by 12 for the annual cash flow figure.

What is a good cash-on-cash return on a rental property?

For residential buy-and-hold, 8 to 12 percent is a common target. Below 6 percent is modest and only makes sense when long-term return (appreciation, principal paydown) carries the deal. Above 12 percent often signals a high-yield market or strong acquisition.

What is included in an owner cash flow statement?

Gross rent collected, vacancy loss, other income, operating expenses (property tax, insurance, maintenance, management fee, HOA, utilities if applicable), debt service, and net cash flow. NARPM-aligned statements separate each line item clearly and present cash flow as a single monthly figure.

What is NOI on a rental property?

NOI (net operating income) equals effective rent plus other income, minus operating expenses, before debt service. NOI is the standard metric for comparing properties across different financing structures and for computing cap rate (NOI divided by property value).

What expenses should be included in a rental property cash flow calculation?

Property tax, insurance, maintenance and repairs, management fee, HOA dues if applicable, utilities you pay (water, trash, common-area electricity), reserves for capital expenditures (HVAC, roof, appliances), and any required licensing or compliance fees. Mortgage payment is included as debt service but is technically below the NOI line.