How do I evaluate a rental property?
In one paragraph
Evaluating a rental property requires analyzing three numbers: gross rent potential, realistic operating expenses (including vacancy and reserves), and total cash invested — the result is a cash-on-cash return that can be compared against alternative investments.
What this actually means
Evaluating a rental property is an exercise in applied arithmetic, not intuition. Investors who rely on gut feel about a neighborhood or enthusiasm about a listing price consistently overpay or underestimate carrying costs. A disciplined evaluation follows a consistent sequence.
Start with gross rental income — what the market will actually support in monthly rent, not what the seller claims. Research comparable rentals in the immediate area on current listing sites. Be conservative; optimistic rent projections are the most common source of deals that underperform.
Next, apply the 50% rule as a quick filter. Roughly half of gross rent in a typical single-family or small multi-family will be consumed by operating expenses before the mortgage. That includes property taxes, insurance, vacancy allowance (typically 5–8%), repairs and maintenance, capital expenditure reserves for major systems (roof, HVAC, water heater), and property management if the investor will not self-manage. If the remaining 50% does not cover the mortgage payment with meaningful cash flow to spare, the deal deserves very close scrutiny before proceeding.
The net operating income (NOI) — gross income minus operating expenses, before debt service — divided by the purchase price gives the cap rate, which enables apples-to-apples comparison across properties regardless of how they are financed. After applying financing, the actual cash-on-cash return reveals what percentage the investor earns on their deployed capital each year.
Physical due diligence runs parallel to financial analysis. A licensed home inspector should evaluate the property's major systems and structure. Deferred maintenance visible at inspection is negotiating leverage or a signal to walk away.
Investors should also model a stress test: what happens if the unit sits vacant for two months, a major repair hits in year one, or rates rise and refinancing becomes expensive? Properties that cannot survive reasonable adverse scenarios should command a price discount.
Set for Life by Scott Trench covers this evaluation sequence accessibly for new investors. The Intelligent Investor by Benjamin Graham develops the deeper analytical habit of running conservative numbers and demanding a margin of safety before any capital commitment.
