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Is This Rental a Good Deal? How to Know in 60 Seconds

It is the question every buyer asks and most answer with a gut feeling: is this rental a good deal? The honest answer is not "it depends" — it is four numbers and a stress test. Here is exactly how to judge any rental property in about a minute, and how a free AI deal analyzer does the math for you.

A good deal is defined before you buy

Unlike stocks, a rental's outcome is largely knowable up front. The price, rent, expenses, and financing terms are all on the table before you make an offer. That means "is this a good deal?" is a math question, not a hope. Investors who answer it with numbers consistently beat those who fall in love with the house.

The four numbers that decide it

1. Cash flow. After the mortgage, taxes, insurance, vacancy, management, maintenance, and reserves — does money actually land in your account? Negative cash flow on day one is a bet on appreciation, not an investment in income.

2. Cash-on-cash return. Annual cash flow divided by the cash you invested. This tells you how hard your down payment is working. Compare it to safer alternatives before you commit capital.

3. Cap rate. NOI divided by price. A normalized yield that lets you compare this property against others in the same market regardless of financing.

4. DSCR. NOI divided by annual debt service. This is the first number a rental lender checks. Below roughly 1.20–1.25, the property does not comfortably cover its own loan — a warning sign even if you are paying cash. Confirm it with the DSCR calculator.

The expenses that turn "good" deals bad

Most deals that look like winners on a seller's pro-forma are losers in reality, because the pro-forma leaves things out. Always include a realistic vacancy rate, property management (even if you self-manage today), ongoing maintenance, and capital expenditure reserves for the roof and HVAC that eventually come due. Use real rent comps, not the seller's optimistic number. The rental cash flow tool includes all of these fields for exactly this reason.

The 60-second test

Here is the fast version. Drop the price, rent, financing terms, and expenses into the AI property deal analyzer. It returns cap rate, DSCR, cash-on-cash, and cash flow with a BUY / PASS / CONDITIONAL verdict and the reasoning behind it. Then re-run it at an interest rate one to two points higher. If the deal still works under stress, you have a margin of safety. If it only works at today's best-case rate and rent, it is fragile — negotiate the price or walk.

What "CONDITIONAL" really means

A conditional verdict is the most useful outcome of all: the deal can work if specific assumptions hold. Maybe it needs a 5% lower price, $150 more in rent, or a better rate. Now you know exactly what to negotiate before you spend another hour or a dollar of earnest money. That is the difference between a structured analysis and a gut feeling.

Answer the question on a real listing now

Stop guessing on your next lead. Run it through the free AI property deal analyzer and get a clear answer in under a minute. Want the full method first? Read the real estate deal analysis guide, or compare tools in the deal analysis software overview.