How to Calculate Rental Property ROI
July 15, 2026"What's my ROI?" is a deceptively simple question for a rental property, because there are several different, legitimate ways to calculate it, and each answers a slightly different question. Knowing which one to use — and what it actually tells you — matters more than getting a single number.
Cash-on-cash return
Cash-on-cash return measures the annual pre-tax cash flow against the actual cash you invested (down payment, closing costs, initial repairs) — not the full purchase price. It's the most useful metric if you financed the property, since it reflects the real return on the money you personally put in, leverage included.
Formula: Annual Pre-Tax Cash Flow ÷ Total Cash Invested × 100
Cap rate (capitalization rate)
Cap rate measures a property's net operating income against its purchase price or current market value, ignoring financing entirely. It's most useful for comparing properties against each other on an apples-to-apples basis, since it strips out how each one happens to be financed.
Formula: Net Operating Income ÷ Property Value × 100
Total ROI (including appreciation and equity paydown)
Cash flow metrics alone understate a leveraged rental's total return, since they ignore two other real sources of wealth-building: property appreciation and the equity you build as tenants' rent pays down your mortgage principal. A more complete ROI calculation adds all three together over a holding period.
Formula: (Total Cash Flow + Appreciation + Principal Paydown) ÷ Total Cash Invested × 100
What counts as net operating income
Get this number right first, since it feeds into both cap rate and cash-on-cash calculations. Net operating income (NOI) is:
- • Gross rental income (plus any other income like parking or laundry fees)
- • Minus vacancy loss (a realistic vacancy rate for your market, not zero)
- • Minus operating expenses (property tax, insurance, maintenance, property management, utilities you cover)
- • NOT including mortgage principal and interest — debt service is excluded from NOI by definition
Common mistakes that inflate ROI on paper
A few habits consistently make a rental look more profitable on a spreadsheet than it performs in reality:
- • Assuming 0% vacancy — even strong markets typically see some turnover and vacancy loss
- • Underestimating maintenance and capital expenditure reserves (a new roof or HVAC system eventually comes due)
- • Excluding property management costs, even if you self-manage today — your own time has a real cost if you ever want to scale
- • Using the current appreciated value instead of your actual purchase price when calculating cap rate on a property you already own
Use a calculator to check your numbers
Running these calculations by hand across every deal you're considering is slow and error-prone. Our rental property ROI calculator runs cash-on-cash return, cap rate, and cash flow projections from your actual numbers, so you can compare potential purchases or check an existing property's performance quickly.
Frequently Asked Questions
What's a "good" ROI for a rental property?
This varies widely by market, strategy, and risk tolerance — cash-on-cash returns in the 8-12% range are commonly cited as solid in many markets, but high-appreciation markets often accept lower cash-on-cash returns in exchange for expected appreciation. There's no single universal benchmark.
Is cap rate or cash-on-cash return more important?
They answer different questions — cap rate is better for comparing properties independent of financing, while cash-on-cash return reflects your actual return given how you financed the specific deal. Most investors look at both, not one instead of the other.
Should I include appreciation in my ROI calculation?
It depends what you're trying to measure. Cash flow metrics (cash-on-cash, cap rate) intentionally exclude appreciation since it's unrealized and market-dependent. A total ROI calculation including appreciation gives a fuller picture of wealth-building but relies on an appreciation assumption that may not hold.
How do I calculate ROI on a property I already own outright (no mortgage)?
With no debt service, cash-on-cash return and cap rate converge to the same calculation — net operating income divided by either your original cash invested or the property's value, since there's no financing to separate the two metrics.
Does rental property ROI account for taxes?
The formulas above are pre-tax. Rental property has favorable tax treatment in many cases (depreciation, deductible expenses), so after-tax returns can differ meaningfully from the pre-tax numbers — factor in your specific tax situation with a CPA for a complete picture.