Beginner8 min read

How to Analyze a Rental Property

Analyzing a rental comes down to one question: after every realistic expense, does the property still put money in your pocket? Here's the math, step by step.

A rental analysis flows top to bottom: start with income, subtract operating expenses to get NOI, subtract the mortgage to get cash flow, then measure your return. Skip a step — or fudge an expense — and a bad deal can look great on paper.

Step 1 — Gross rent & vacancy

Start with the realistic market rent(what it actually rents for today, not the listing's wish price). Then subtract a vacancy allowance — typically 5–8% — because no unit stays rented 100% of the time. The result is your effective gross income.

Step 2 — Operating expenses

These are the costs of owning and operating the property — excluding the mortgage. Budget for all of them, even the ones you hope to avoid:

●Property taxes and insurance (landlord/DP-3 policy).
●Property management — ~8–10% of rent, even if you self-manage (your time has value, and you may hire out later).
●Maintenance & repairs — ~5–10% of rent for the steady drip of fixes.
●CapEx reserves — ~5–10% set aside for big-ticket replacements (roof, HVAC, water heater) that don't happen monthly but always happen eventually.
●Utilities, HOA, lawn/pest — whatever the owner pays.

The expenses that sink new investors

Vacancy, maintenance, CapEx, and management are the four most commonly ignored line items. They're not optional — they're just irregular. Reserve for them every month so a single roof or turnover doesn't wipe out a year of cash flow.

Step 3 — NOI (Net Operating Income)

NOI = effective gross income − operating expenses(still before the mortgage). NOI is the property's pure earning power and the basis for the cap rate. Two key metrics come straight from it:

●Cap rate = annual NOI ÷ purchase price. A way to compare properties independent of financing.
●DSCR = annual NOI ÷ annual debt service. Lenders want this above ~1.20–1.25 for a DSCR loan.

Step 4 — Cash flow & cash-on-cash return

Subtract the annual mortgage payment (debt service) from NOI to get your cash flow. Then measure the return on the actual cash you invested:

Cash-on-cash return = annual cash flow ÷ total cash invested (down payment + closing costs + any rehab). It answers the real question: what return is my money earning? Many investors target roughly 8%+ cash-on-cash, but the right threshold depends on your market and goals.

A quick example

●Rent $1,500/mo → less 6% vacancy ≈ $1,410 effective.
●Operating expenses (taxes, insurance, mgmt, maint, CapEx) ≈ $560/mo → NOI ≈ $850/mo.
●Mortgage (P&I) ≈ $700/mo → cash flow ≈ $150/mo ($1,800/yr).
●Cash invested $45,000 → cash-on-cash ≈ 4%. Thin — negotiate price, raise rent, or pass.

The Rental analysis in the Deal Underwriter does all of this live — NOI, cap rate, DSCR, and cash-on-cash.Analyze a rental →

Key takeaways

✓Work top-down: rent → minus vacancy → minus operating expenses = NOI → minus mortgage = cash flow.
✓Always budget vacancy, maintenance, CapEx, and management — even when self-managing.
✓NOI drives cap rate (NOI ÷ price) and DSCR (NOI ÷ debt service).
✓Cash-on-cash return (annual cash flow ÷ cash invested) measures what YOUR money earns.
✓If the return is thin, fix it with price, rent, or financing — or walk away.

Educational information only — not legal, tax, or financial advice. Real estate involves risk; verify numbers and consult licensed professionals before making decisions.

← More articles