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Five Costs First-Time Investors Forget to Add Up The purchase price and the mortgage payment are the easy numbers. They're printed on the listing, they ...
The purchase price and the mortgage payment are the easy numbers. They're printed on the listing, they show up in the calculator, and they're what most people mentally lock onto when they run the math on a first rental. The problem is that they're only about two-thirds of what actually leaves your account every year, and the other third is where the real cash flow gets decided.
None of these are surprises if you know to look for them. They just tend to live outside the two headline numbers, so they slip through when you're doing quick math on a Franklin duplex you're excited about.
The tax figure on a listing is often the seller's number, and the seller may have owned the place for years. Williamson County reassesses, and what a longtime owner paid isn't automatically what you'll pay going forward, especially if the home last changed hands well below current value.
For a rental in the mid-price range around Franklin, this line can swing your monthly math by a meaningful amount once you plug in the current assessed value instead of an old one. Always run your numbers on what the taxes will be under your ownership, not what the prior owner enjoyed.
If you're not sure how to find that current figure, it's a five-minute lookup, and it's one of the first things we check when a client sends us a deal to sanity-check.
A rental needs a landlord policy, sometimes called a dwelling policy, and it prices differently than the homeowner's insurance you'd carry on the house you live in. It covers the structure and your liability as a landlord, but the coverage math changes when the property is tenant-occupied.
Investors who quote themselves a homeowner's rate and drop it into the spreadsheet usually come in low. Get an actual landlord quote before you commit to a number, because the gap is real enough to matter on a tight deal.
Even a well-located Franklin rental in a neighborhood like Westhaven or off Carothers isn't rented 365 days a year, every year. Tenants move. A lease ends, someone relocates for work, and the unit sits empty while you turn it and find the next renter.
A reasonable way to budget for this is to set aside a small slice of each month's rent as if the unit were vacant part of the year, even in months it isn't. That reserve smooths out the stretch when rent stops but the mortgage, taxes, and insurance don't. Skip this line and your cash flow looks great right up until the month it isn't.
People tend to lump these together, but they behave differently. Ongoing maintenance is the water heater, the HVAC service, the leaky faucet, the small stuff that comes up while someone lives there. Turnover is the cost of getting the place rent-ready between tenants: paint, cleaning, a carpet you finally have to replace, the odd repair a departing tenant surfaced.
An older Franklin property with charm often carries higher maintenance than a newer build, and that's fine as long as you priced it in. A common approach is to reserve a percentage of rent for routine maintenance and a separate lump for each turnover, because leaning on one number to cover both is how investors get caught short in a heavy year.
Neither of these means the property was a poor buy. They mean it's a real building with real systems, and every rental has them.
Here's the line most first-time investors zero out entirely: management. If you're managing the property yourself, you might think it costs nothing, but your time has a value and your systems have a cost, from listing and screening to rent collection and the maintenance calls that come at inconvenient hours.
Even if you self-manage on day one, build a management figure into your numbers anyway. It tells you the honest truth about the deal, because a rental that only cash flows when you work it for free isn't cash flowing, it's paying you a small wage. And it means that when life gets busy and you decide to hand the property off, the math already works.
When Redbird Real Estate underwrites a first rental with a client, we plug in a management line whether or not they intend to use us for it, precisely so the deal stands on its own merits. If it works with management priced in, it works. If it only works without, that's worth knowing before you sign, not after.
Add the five together and you get a number that looks smaller than the one you started with. That's not a reason to walk away from Franklin rentals. It's the reason the good ones are worth buying: you knew the real figure going in, and the property still made sense.
The deals that go sideways for first-time investors aren't usually bad properties. They're good properties bought on incomplete math, where taxes reset higher, a landlord policy cost more than a homeowner's quote, the unit sat vacant a couple of months, an older system needed work, and there was no management line to absorb it.
Run the full number first. If you want a second set of eyes on a Franklin deal before you commit, that's exactly the kind of quiet, unglamorous math we're happy to sit down and do with you.