How to Analyze a Rental Property (Step-by-Step)

Start with the annual gross rent: the total rent if the property were fully occupied every month. Don't use the seller's stated income without verification. Sellers routinely quote the current lease rate, which may be below market, or above market on a soon-to-expire lease.

How to verify market rent: Check 3–5 comparable active listings in the same neighborhood on Zillow or Rentometer. Look for properties with the same bedroom count, square footage, and condition within a half-mile radius. If all comps come in at $1,800/month and the seller is claiming $2,100, use $1,800 in your model.

Then apply a vacancy allowance to arrive at your Effective Gross Income (EGI). Even in high-demand markets, assume at least 5% (roughly 18 days per year). In softer markets, use 8–10%. This accounts for tenant turnover, days on market between leases, and the occasional deadbeat.

This is where most beginners underestimate costs. Every skipped expense is money you thought you were making but weren't. Here is the complete list:

Rule of thumb: Total operating expenses should be 35–50% of gross rent for a typical single-family rental. If a deal shows expenses below 30%, the seller is likely omitting CapEx or management. If expenses are above 55%, there may be deferred maintenance or an expensive HOA.

Continuing the example above: assume $8,500/year in operating expenses on a $250,000 property (taxes + insurance + management + maintenance + CapEx).

With EGI and operating expenses in hand, you can now calculate Net Operating Income (NOI):

Now calculate the cap rate:

Cap rate strips out financing and tells you the unlevered annual yield. Compare it against local market cap rates to quickly see if you're overpaying. If comps in that neighborhood sell at 5.5% cap rates and this one is at 4.6%, you're paying a premium — understand why before you proceed.

Enter your actual mortgage terms: loan amount, interest rate, and term. This translates NOI into the real money-in-your-pocket number.

Annual Cash Flow = NOI − Annual Debt Service

At 7% interest, this deal is cash-flow negative. That doesn't automatically make it a bad deal — but you need a clear appreciation thesis or you need to negotiate the price down. Then calculate cash-on-cash return:

This CoC is negative because of high interest rates. Use the Deal Negotiator to find the maximum purchase price that gets you to a target CoC of, say, 5%.

DSCR tells you whether the property's income can cover its debt payments. Lenders require DSCR ≥ 1.25 on most investment property loans.

A DSCR below 1.0 means the rental income doesn't cover the mortgage — you're subsidizing the property out of pocket. A DSCR of 1.25+ means the income comfortably services the debt with a cushion.

A single year's cash flow is a snapshot. Real estate returns compound over time through rent growth, mortgage paydown, and appreciation. Model your deal over 5–10 years with:

• Rent growth: 2–3%/year is a conservative assumption for most markets
• Expense growth: 2%/year for inflation on operating costs
• Property appreciation: 2–4%/year historically for residential US real estate
• Exit value: Apply your target cap rate to projected Year 5/10 NOI

This gives you IRR, the most complete measure of long-term investment performance. A deal with negative Year 1 cash flow might still generate a 12% IRR over 10 years if appreciation is strong. Conversely, a deal with positive cash flow today may have a mediocre IRR if the market is flat.

The Real-Estate Analyzer calculates a full year-by-year forecast and IRR automatically. You set the horizon (1–30 years) and growth assumptions.

Before committing, run at least three adverse scenarios to understand your downside:

A good deal stays cash-flow positive (or at least tolerable) under reasonable adverse scenarios. If breaking even requires everything to go right, the deal has no margin of safety. Read more about stress testing real estate deals.

There is no universal buy/pass threshold, but here are the benchmarks most experienced investors use for a standard buy-and-hold rental:

These are starting points, not rules. A deal with a 4% CoC in a high-appreciation coastal market might be perfectly sound. A deal with 7% CoC in a declining population market might be a trap. Context matters — use the benchmarks as a starting filter, then dig deeper.