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Three Numbers We Check Before Calling a Rental a Good Deal A listing can look great and still be a mediocre investment. The photos are fresh, the rent s...
A listing can look great and still be a mediocre investment. The photos are fresh, the rent sounds strong, the neighborhood is one you'd be happy to own in off Lewisburg Pike or over near Westhaven. None of that tells you whether the deal actually works.
Three numbers do most of that work. We run them before we get excited about anything, and they've talked us out of plenty of properties that looked good at first glance.
The cap rate is the property's annual net operating income divided by its price. Net operating income means rent collected minus the real costs of owning it: taxes, insurance, management, maintenance, vacancy. It deliberately ignores your mortgage.
That's the point. Cap rate tells you how hard the asset works on its own, before you layer financing on top, which makes it a clean way to compare two very different properties.
Here's where people get tripped up. A rental in Franklin that rents for $2,400 a month isn't earning $28,800 a year to your pocket. Strip out taxes, insurance, a management fee, and a realistic maintenance reserve, and that number shrinks fast.
We'd rather use honest operating costs and land on a lower cap rate than use rosy ones and call it a steal. A deal that only works when nothing ever breaks isn't a deal.
Cap rate ignores your loan. Cash flow doesn't, and cash flow is what actually lands in your account.
Take the monthly rent, subtract the mortgage payment, subtract taxes and insurance if they aren't already in the payment, subtract management, and then subtract the costs people leave off the napkin math. Vacancy is one. A unit sitting empty between tenants for a few weeks is normal, not a crisis, but it costs real money and it belongs in the math up front.
Maintenance is the other. Water heaters, HVAC, a roof that's fifteen years into a twenty-five year life. None of those hit every month, so we reserve for them every month, usually a set percentage of rent, so a single repair doesn't wipe out a quarter of returns.
When all of that is subtracted and the number is still positive, you have a property that pays you to own it. When it's barely positive, you own a property that pays itself, which is fine if appreciation is the plan, but you should know which one you're buying.
Before we build a full spreadsheet, we run the fast one: monthly rent divided by purchase price. It's a screening tool, not a verdict, and it saves us from spending an afternoon modeling a property that was never going to pencil.
A lower ratio means you're paying more per dollar of rent, which tends to be the trade in strong, appreciating markets. Franklin is exactly that kind of market. Prices here reflect the schools, the proximity to Nashville, the fact that people genuinely want to live here, so our ratios run tighter than they would an hour further out.
That's not a reason to pass. It's a reason to be honest about what you're buying: a property in Franklin is often as much an appreciation and stability play as a monthly cash-flow play, and the ratio tells you that at a glance.
We use it to sort, not to decide. If the ratio is in a reasonable range for this area, we move to cash flow and cap rate. If it's wildly off, we ask why before anything else.
Any single number can flatter a bad property. A high cap rate can hide deferred maintenance that'll eat you alive in year two. Strong cash flow on paper can rest on rent assumptions last summer's market no longer supports.
A clean rent-to-price ratio can sit on top of taxes you didn't account for.
Run together, they cross-check each other. When cap rate, cash flow, and the rent-to-price ratio all point the same direction, you're usually looking at something real.
The other thing these numbers do is remove the emotion. It's easy to fall for a house because it shows well or sits on a street you'd happily live on yourself. The math doesn't care how the kitchen photographs, and neither should your offer.
The formulas are simple. The inputs are where deals are made or lost, and this is where a lot of first-time investors go sideways through no fault of their own. They're working with the rent the listing claims, not what the unit will actually command, and an insurance quote that isn't theirs yet.
We'd rather pull real comparable rents from what's actually leasing near the property, get a tax figure based on the likely reassessment and not the current owner's bill, and reserve for maintenance like the property is twenty years old even when it isn't. Conservative inputs make the three numbers mean something.
This is a chunk of what our team at Redbird Real Estate does before a client ever makes an offer, and honestly it's where our property management side earns its keep. We manage enough rentals around Williamson County to know what things actually cost to run here, not what a spreadsheet assumes they cost.
Run these three numbers on the next listing that catches your eye. If you want a second set of eyes on the inputs before you decide, that's a conversation worth having early, well before the offer and not after.