How to Calculate ROI on Rental Property (With Real Examples)

Why ROI matters for landlords

Return on investment tells you whether your rental property is actually making you money — and how it compares to alternative investments like index funds. Without tracking ROI, you're guessing. There are three common metrics landlords use, and each tells you something different.

Metric 1: Cap rate

The capitalization rate measures your return based on the property's value, ignoring how you financed it. It answers: "If I paid cash for this property, what would my return be?"

Formula: Cap Rate = Net Operating Income / Property Value x 100

Net Operating Income (NOI) is your annual rental income minus all operating expenses (taxes, insurance, maintenance, management, vacancy allowance) — but NOT including mortgage payments.

Example: A property worth $300,000 generates $30,000 in annual rent. Operating expenses total $12,000. NOI = $18,000. Cap rate = $18,000 / $300,000 = 6.0%.

Cap rates vary dramatically by market. In San Francisco, 3-4% is typical. In Detroit, 10-14% is achievable. In most suburban markets, 5-8% is the normal range. A higher cap rate means higher returns but often comes with higher risk or more management intensity.

Metric 2: Cash-on-cash return

This is the most practical metric for landlords who finance their properties. It measures your annual cash return relative to the actual cash you invested — your down payment, closing costs, and any renovation costs.

Formula: Cash-on-Cash = Annual Cash Flow / Total Cash Invested x 100

Annual Cash Flow is your NOI minus your annual mortgage payments (principal + interest).

Example: Same property. You put 25% down ($75,000) plus $5,000 in closing costs = $80,000 cash invested. NOI is $18,000. Annual mortgage payments are $14,400. Cash flow = $3,600. Cash-on-cash = $3,600 / $80,000 = 4.5%.

That might seem low, but remember — you're also building equity through mortgage paydown, and the property may appreciate. Cash-on-cash only measures the cash in your pocket today.

Metric 3: Total ROI

Total ROI captures the complete picture: cash flow, equity buildup, appreciation, and tax benefits.

Components:

Total annual return: $19,500 on $80,000 invested = 24.4% total ROI.

This is why real estate investors say leverage is powerful. Your 25% down payment is generating returns on 100% of the property's value and appreciation.

Common mistakes in ROI calculations

Ignoring vacancy: Always budget for vacancy, even in hot markets. Use 5% for strong markets, 8-10% for average markets. A month of vacancy on a $2,000/month rental costs you $2,000 plus turnover expenses.

Underestimating maintenance: Budget 1% of property value per year for maintenance on newer properties, 1.5-2% for older ones. A $300,000 property should budget $3,000-6,000/year for maintenance.

Forgetting capital expenditures: Roofs, HVAC systems, water heaters, and appliances all have lifespans. Budget a monthly CapEx reserve (typically $100-200/month) so a $15,000 roof replacement doesn't destroy your returns.

Using asking rent instead of market rent: Base your calculations on what comparable properties actually rent for, not what you hope to get. Check current listings and recently rented properties in the same area.

Track your actual ROI

The best ROI calculation uses real numbers, not projections. Track every dollar of income and expense as it happens, not from memory at the end of the year. A financial ledger that categorizes by property gives you the data to calculate your true ROI at any time.

RentalSlate gives you a free income and expense ledger organized by property — so you always know your real numbers, not estimates.