How to Evaluate Franklin Acquisition Deals Using Cap Rate and Cash-on-Cash Return

Start with gross rental income. For a Franklin duplex listed at $525,000 where each unit rents for $1,600 per month, your gross annual income is $38,400.

Next, subtract a vacancy allowance. Many Franklin investors use a range between 5% and 8%, depending on the neighborhood and property type. A property near downtown Franklin or the Cool Springs corridor may experience lower vacancy than one farther from employment centers, but build in a buffer regardless.

Then subtract annual operating expenses:

• Property taxes (Williamson County rates apply — check your specific parcel)
• Insurance
• Maintenance and repairs (a common estimate is 5–10% of gross rent)
• Property management fees (typically 8–10% of collected rent if you hire a manager)
• HOA dues, if applicable

If that duplex carries $6,000 in taxes, $1,800 in insurance, $2,500 in maintenance, and $3,072 in management fees — and you budget 6% for vacancy ($2,304) — your NOI comes to roughly $22,724.

Step 2: Run the Cap Rate Formula

A capitalization rate — or cap rate — is the ratio of a property's NOI to its purchase price, expressed as a percentage. It strips out financing so you can compare properties on a level playing field.

Cap Rate = NOI ÷ Purchase Price

Using our duplex example: $22,724 ÷ $525,000 = 4.33% cap rate.

This single number lets you stack properties side by side. A $400,000 single-family rental in Westhaven with an NOI of $18,000 has a 4.5% cap rate, while a $700,000 triplex off Columbia Avenue with an NOI of $35,000 clocks in at 5.0%.

Cap rates in suburban middle Tennessee markets generally run lower than in higher-risk metros, reflecting the stability and demand Franklin's housing market carries into 2026. A lower cap rate doesn't automatically mean a bad deal — it often signals lower risk and stronger appreciation potential.

What Does a "Good" Cap Rate Look Like in Franklin?

There's no universal answer, because cap rate benchmarks shift with interest rates, local demand, and property class. In 2026, Franklin investors should compare any deal's cap rate against current borrowing costs. If your mortgage rate exceeds the cap rate, you're buying into negative leverage — meaning the debt is dragging returns down rather than amplifying them.

Use cap rate as a screening tool: it tells you whether a property's income justifies the price relative to other options. It does not tell you how your actual cash will perform once you layer in a mortgage.

Step 3: Determine Your Total Cash Invested

Cash-on-cash return answers a different question: what is my out-of-pocket money actually earning? To calculate it, you need to know exactly how much cash you're putting into the deal.

Add up:

• Down payment (e.g., 25% of $525,000 = $131,250)
• Closing costs (budget 2–3% of purchase price in Tennessee)
• Immediate repairs or capital improvements

For our duplex, assume $131,250 down, $12,000 in closing costs, and $5,000 in minor unit turns. Total cash invested: $148,250.

Step 4: Calculate Cash-on-Cash Return

Cash-on-cash return is your annual pre-tax cash flow divided by your total cash invested.

Cash-on-Cash Return = Annual Cash Flow ÷ Total Cash Invested

First, find annual cash flow by subtracting your annual mortgage payments from NOI. If your loan is $393,750 at a 7% rate on a 30-year term, your annual debt service is roughly $31,440.

$22,724 (NOI) – $31,440 (debt service) = –$8,716

That's a negative cash-on-cash return, which means this deal — at this price, this rate, and these rents — doesn't cash flow. The cap rate looked reasonable, but the financing terms flip the picture.

When Should You Walk Away From a Deal?

Negative cash-on-cash return isn't always a dealbreaker if you're buying for long-term appreciation or plan to increase rents after improvements. But it is a clear signal to pressure-test your assumptions. Ask yourself:

• Can rents realistically increase within 12 months?
• Are operating expenses padded too conservatively — or not conservatively enough?
• Does a different loan product (adjustable rate, shorter amortization, larger down payment) change the outcome?

If the numbers only work under best-case assumptions, the deal carries more risk than the return justifies.

Common Mistakes Franklin Investors Make With These Formulas

• Ignoring vacancy. Using 0% vacancy inflates NOI and makes every deal look better than it is.
• Forgetting property management costs. Even if you self-manage today, build in management fees. Your time has value, and your strategy may change.
• Mixing up cap rate and cash-on-cash. Cap rate ignores your mortgage; cash-on-cash depends on it. Comparing one investor's cap rate to another's cash-on-cash return is meaningless.
• Using asking price instead of offer price. Run both formulas at the price you'd actually pay, not the list price.

At Redbird Real Estate, our work with Franklin buyers and investors centers on exactly this kind of analysis — helping you move past gut instinct and into numbers-driven decisions. Whether you're evaluating a duplex near Five Points or a small commercial property along Murfreesboro Road, running cap rate and cash-on-cash return side by side gives you the clarity to make confident, well-informed offers.

For Tennessee-specific guidance on property tax rates and assessment ratios that feed into these calculations, the Williamson County Property Assessor's office publishes current data you can use directly in your underwriting.