Calculating Rental Property ROI
ROI on a rental property isn't a single number — different metrics tell you different things, and understanding all of them gives a fuller picture than any one alone.
Cash Flow
Monthly rent minus all expenses (mortgage, taxes, insurance, management, maintenance reserve, vacancy allowance) equals monthly cash flow — the most immediate, tangible measure of a property's performance.
Cap Rate
Net operating income divided by purchase price gives the capitalization rate, a useful way to compare properties independent of financing terms — helpful when evaluating multiple potential purchases.
Cash-on-Cash Return
Annual cash flow divided by total cash actually invested (down payment, closing costs, initial repairs) shows the return specifically on the money you put in, factoring in leverage from financing.
Don't Forget Appreciation
ROI calculations often focus only on cash flow, but long-term appreciation is part of total return too — though it's less predictable and shouldn't be the sole basis for an investment decision.
Common Mistakes in ROI Math
Underestimating vacancy, forgetting maintenance reserves, or using best-case rent instead of realistic comps all inflate ROI projections on paper in ways that don't hold up in practice.
Running the Numbers Before You Buy
A realistic ROI projection — using actual local rent comps and a conservative expense estimate — should be part of evaluating any potential purchase, not an afterthought done after closing.
Frequently Asked Questions
Cap rate measures return relative to purchase price regardless of financing; cash-on-cash return measures return specifically on the cash you invested, factoring in leverage.
Using optimistic rent estimates and underestimating vacancy and maintenance reserves, which inflates projected returns beyond what actually holds up.
