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Three Numbers That Tell You If a Rental Is Worth It Most rental deals live or die on three numbers, and you can run all three on your phone in the drive...
Most rental deals live or die on three numbers, and you can run all three on your phone in the driveway before you ever call your agent. They don't require a spreadsheet or a finance degree. They just require you to be honest about what a property actually earns and actually costs.
Plenty of Franklin rentals look great in a listing photo and fall apart the moment you subtract the mortgage, the taxes, and the vacancy months. So before you fall for the porch or the school district, run the math.
This is your fastest gut check. Take the monthly rent a property can realistically command, divide it by the purchase price, and you've got a percentage that tells you at a glance whether the deal is even in the conversation.
A place renting for $2,400 a month at a $400,000 purchase price gives you 0.6 percent. In a market like Franklin, where prices have stayed strong and rents haven't fully kept pace, you'll see a lot of numbers in that range. That doesn't automatically kill a deal, but it tells you the property is leaning on appreciation more than monthly cash.
The mistake people make is guessing the rent high. Pull what comparable homes in the same neighborhood actually lease for, whether that's a townhome near Cool Springs or a single-family place off Hillsboro Road, not what the seller swears it "should" get.
The number that surprises people is what's left over once the property is genuinely paid for month to month. Not rent minus mortgage. Rent minus everything.
Everything means the mortgage payment, property taxes, insurance, and the costs that don't show up until you own the thing: repairs, a management fee if you're not handling tenants yourself, and the months the unit sits empty between leases. A common way to plan for the unglamorous stuff is to set aside somewhere around 8 to 10 percent of rent for maintenance and another 5 to 8 percent for vacancy, then adjust based on the age and condition of the home.
Run a $2,400 rental through all of that and the "profit" you pictured can shrink fast. A property might net you a couple hundred dollars a month, or it might sit right at break-even. Neither is automatically bad.
You just want to know which one you're buying before closing, not after your first plumber visit in year one.
Here's where a lot of Franklin investors get comfortable being wrong on purpose: they'll accept thin cash flow on a well-located home because the appreciation and the loan paydown do the heavy lifting over time. That's a legitimate strategy. It's only a problem when you didn't mean to choose it.
The first two numbers tell you if the property works. This one tells you if your money is working.
Cash-on-cash return measures your annual cash flow against the actual cash you put into the deal, meaning your down payment, closing costs, and any money spent getting the place rent-ready. If you put $95,000 into a property between down payment and fix-up, and it throws off $3,800 a year in real cash flow, that's a 4 percent cash-on-cash return.
Why bother with this one when you already know the cash flow? Because it lets you compare a rental against everything else you could do with that same pile of money. A property with strong monthly numbers can still be a mediocre use of capital if you had to sink an enormous amount in to get there.
The number that looks good to you depends on your goals. Some investors are thrilled with 4 to 6 percent in a stable, low-headache Franklin neighborhood because they're playing the long appreciation game. Others want to see more and are willing to take on older properties or more management to get it.
There's no universal passing grade, only the grade that fits your plan.
Run all three and you'll know whether a rental makes financial sense. What they won't capture is whether it's the right property for the life you want as a landlord.
A duplex near downtown Franklin might pencil out beautifully and still be more turnover and tenant management than an out-of-state owner wants to deal with. A quiet single-family home in a family neighborhood might show a thinner return and be the easiest thing you'll ever own, with tenants who stay for years. The math is the filter, not the whole decision.
Local details move these numbers in ways a generic rent estimate never catches. Property taxes, HOA fees where they exist, how quickly a specific pocket of Williamson County leases up in the fall versus the spring... all of it changes the final picture. That's the part worth pressure-testing with someone who watches these neighborhoods every day.
The honest version of this process is doing the math first and letting the emotion come second, which is harder than it sounds when a place shows well.
At Redbird, we'd rather walk a client through these three numbers on a property they love and have them decide it's not the deal, than watch them buy on a feeling and find out at tax time. A good rental should hold up to a rent-to-price check, produce cash flow that survives real expenses, and put your money to work at a rate you can live with.
If a property clears all three, you've got something worth a serious look. If it only clears one or two, that's not a no. It's a signal to figure out which number is dragging, why, and whether you're comfortable owning that tradeoff on purpose.