Most listings won't work as rentals, and you can usually tell within a few minutes. A quick first screen rules out the weak ones, so you can spend your time on the few that deserve real due diligence.

A five-minute screen doesn't replace an inspection, insurance quotes, a lender's terms, or a look at the actual tax bill. Its job is to tell you where to spend that time.

The 5 numbers that matter

  1. Monthly cash flow: rent minus all monthly costs, including the mortgage. Positive means the property pays for itself on paper.
  2. Net operating income (NOI): annual rent minus operating expenses, excluding the mortgage.
  3. Cap rate: NOI divided by the purchase price. It compares properties independent of financing.
  4. Cash-on-cash return: annual cash flow divided by the cash you put in (down payment, closing costs, and any up-front repairs).
  5. Breakeven price: the highest price at which monthly cash flow is still zero. It shows how much room you have to negotiate.

Step 1: Estimate the rent

This is the most important input and the easiest to get wrong. Look at comparable rentals (comps) near the property that match on:

  • Property type (house, condo, multi-family)
  • Bedrooms and bathrooms
  • Size, age, and condition

Take the median of several good comps rather than a single listing. Keep in mind that advertised rents are asking rents, which can run above what tenants sign for.

Rent assumes a rent-ready home. Comps are homes ready for a tenant. If the property needs work first, it won't earn that rent until the work is done, and that cost belongs in your analysis (see Step 3).

Step 2: Add up the expenses

Common starting assumptions for a first screen (replace them with real numbers before you make an offer):

  • Mortgage: based on your down payment, rate, and term. 20–25% down is typical for investment properties.
  • Property tax: varies enormously by location, and rentals are often taxed more than owner-occupied homes, because they don't get homestead exemptions. In the Lincoln Institute's 2025 study, effective tax rates on rental property ranged from about 0.3% in Honolulu to 3.7% in Detroit. Use the county's rate for non-owner-occupied property, not a statewide average.
  • Insurance: get a quote. Costs are much higher in coastal, wildfire, and flood-prone areas.
  • Vacancy: 5–8% of rent is a common starting point; more in softer markets.
  • Property management: 8–10% of rent. Include it even if you self-manage, so the deal still works if you stop.
  • Maintenance: 8–10% of rent for routine repairs, more for older homes.
  • Capital expenditures: roofs, HVAC, and water heaters wear out. Many investors set aside a separate reserve for them.
  • HOA fees, owner-paid utilities, and local rental licensing, where they apply.

Step 3: Run the numbers

  • Monthly cash flow = rent − (mortgage + taxes + insurance + vacancy + management + maintenance + other costs)
  • Annual NOI = annual rent − annual operating expenses (everything above except the mortgage)
  • Cap rate = annual NOI ÷ purchase price
  • Cash-on-cash return = (monthly cash flow × 12) ÷ cash invested

Cash invested should include the down payment, closing costs, and any repairs needed to make the home rent-ready. Leaving out repairs makes cash-on-cash return look better than it is.

Step 4: Decide your criteria in advance

There's no universal "good" number. Targets depend on the market, the property's age and condition, your financing, and your goals. Many investors start a screen with criteria along these lines:

  • Cash flow: enough cushion that one repair doesn't wipe out the year. Many aim for $100–300 a month per unit.
  • Cap rate: around 5% or more in many markets; higher where prices are low.
  • Cash-on-cash return: many investors look for 8% or more.

Set your criteria before you search, and apply them consistently.

Step 5: Check the neighborhood

Strong numbers in a weak area can be a trap. A high cap rate often reflects location risk the spreadsheet doesn't show: more tenant turnover, longer vacancies, collection problems, older housing, and slower appreciation.

ApriFind's Apri Score rates every neighborhood from 1 (strongest) to 10 (weakest) using census-level socioeconomic data, including income, education, employment, and housing quality, compared with other neighborhoods in the same state. It's shown on every listing and as a map layer, so you can see the trade-off between return and location at a glance (see it for any city). The trade-off is real: in our October 2026 Cleveland data, listings in Apri Score 8–10 areas had a median cap rate of 8.1%, against 2.1% in areas scoring 1–3.

Use the score to decide where to look and how much cushion to require. Then add what no score can see: the specific block, nearby employers and amenities, local vacancy, crime, and a visit in person.

Stress-test before you go further

Re-run the numbers with less favorable assumptions:

  • Rent 5–10% lower
  • Higher vacancy and maintenance
  • Your lender's actual rate and fees
  • Known repairs, HOA assessments, or a higher tax bill

If a small change turns the property sharply negative, there's little margin for error.

Doing this for a whole market

The steps above work for one property. Screening an entire city by hand isn't practical. ApriFind applies the same assumptions to every active listing in a city, ZIP code, or radius, estimates rent from nearby comparable rentals, and shows cash flow, cap rate, cash-on-cash return, NOI, and breakeven price for each, alongside its Apri Score. You can change any assumption, add repair costs for each property, and compare properties side by side. For what this looks like across a market, see our cash-flow ranking of the 50 largest US metros.

What these numbers assume

  • Rent-ready condition. ApriFind's rent estimates assume each home is ready to rent. ApriFind doesn't have condition data yet, so the cost of repairs needed to reach that rent is not included unless you enter a repair budget.
  • The "Verify condition" badge is only a rough flag. It marks listings priced far below similar listings nearby, or with a rent estimate far above what similar listings earn; these are often shells, auctions, co-ops, or restricted units. It can't detect a property's actual condition.
  • Property tax is an estimate. ApriFind uses published average rates for rental property (city-level where available, otherwise the state average). Your county's rate can differ.

Use the screen to find candidates, then verify rent, costs, financing, condition, and local rules before making a decision.

FAQ

How long does it take to analyze a rental property? A first screen takes about five minutes: estimate rent from comparable rentals, add up the expenses, and calculate cash flow, NOI, cap rate, cash-on-cash return, and breakeven price. Full due diligence, including an inspection, insurance quotes, your lender's terms, and the actual tax bill, takes longer and is only worth doing for properties that pass the screen.

What numbers should you look at when analyzing a rental property? Five: monthly cash flow, net operating income (NOI), cap rate, cash-on-cash return, and breakeven price. Cash flow shows whether the property pays for itself, cap rate compares properties regardless of financing, cash-on-cash return measures the return on the cash you put in, and breakeven price shows how much room you have to negotiate.

What is a good cap rate for a rental property? It depends on the market. Many investors start around 5% or more, but in ApriFind's October 2026 analysis of the main cities of the 50 largest US metros, median cap rates ranged from about 1% in Portland, OR to about 7% in Cleveland. A high cap rate can also reflect a property in poor condition or a weaker neighborhood, so treat it as a reason to look closer.

Can you analyze every rental property in a city at once? Yes. ApriFind applies the same assumptions to every active for-sale listing in a city, ZIP code, or radius, estimates rent from comparable rentals nearby, and ranks the results by cash flow, cap rate, or cash-on-cash return, with an Apri Score for each listing's neighborhood.

ApriFind provides informational tools only and does not provide investment, financial, legal, or tax advice. Examples are illustrative; actual results vary.