How to Calculate Cash-on-Cash Return on a Rental Property

Cash-on-cash return is the single most useful number when you're evaluating a rental property. It's simpler than most guides make it sound.

The formula

Cash-on-Cash Return = Annual Pre-Tax Cash Flow / Total Cash Invested

Annual pre-tax cash flow is what's left after collecting rent and paying every expense: mortgage, taxes, insurance, property management, maintenance reserve. All before income taxes.

Total cash invested is everything you actually put in: down payment, closing costs, and any immediate repair costs. Not the full purchase price.

A quick example

Say you buy a property for $200,000 with 20% down ($40,000), plus $6,000 in closing costs and repairs. That's $46,000 total cash invested.

After collecting rent and paying every expense, you net $4,600 a year in cash flow.

$4,600 / $46,000 = 10% cash-on-cash return

Where each number in the formula actually comes from

This is the part most guides skip. Here's where to actually find each input on a real listing, not a hypothetical one.

Rent: don't trust the listing's stated rent estimate. Pull comps from actual similar units currently renting nearby, or use a real rent-estimate tool. A listing's own rent number is often optimistic, since it's written to make the deal look good.
Mortgage payment: your lender or a basic amortization calculator gives you this once you know the loan amount, rate, and term. Get a real rate quote, not a rate you saw in a headline six months ago.
Taxes and insurance: county assessor sites publish the current tax bill. For insurance, get an actual quote if you can, since rates vary a lot by property age, roof condition, and location, especially near flood zones or coastlines.
Maintenance reserve: a common rule of thumb is 1% of the property's value per year, though older properties or older major systems (roof, HVAC, water heater) should push that higher.
Property management: even if you plan to self-manage, price it in at the market rate (commonly 8-10% of collected rent). Your time isn't free, and if you ever do hand it off, your numbers shouldn't fall apart.
Vacancy allowance: budget for some number of vacant weeks per year, not zero. Even a great tenant eventually moves out, and the gap between tenants costs you real money.

How financing changes the number

Cash-on-cash return isn't a fixed property trait, it moves with how you finance the deal. Same property from the example above (same rent, same operating expenses, a 7% rate on whatever's financed), three different down payments:

20% down ($46,000 invested):  $4,600 cash flow → 10.0% cash-on-cash
25% down ($56,000 invested):  $4,667 cash flow →  8.3% cash-on-cash (a bit more cash flow, lower return)
All cash ($206,000 invested): $5,664 cash flow →  2.8% cash-on-cash (most cash flow, lowest return by far)

Putting more down reduces your mortgage payment, so your monthly cash flow goes up, but only slightly, since the mortgage itself was already a relatively small piece of the expense stack here. Your return drops a lot more than your cash flow rises, because you're tying up far more cash to get there. Neither number is "wrong." They answer different questions: cash-on-cash return measures how hard your invested dollars are working, not how many total dollars land in your account each month. This is also why cash-on-cash return isn't the same thing as cap rate, which ignores financing entirely and measures the property on its own.

What counts as "good"

There's no universal number. Most buy-and-hold investors target somewhere between 8% and 12%, depending on the market and their risk tolerance. Below that, dig into whether the deal actually clears your bar for the effort and risk of owning rental property. Above that, sanity-check the numbers. An unusually high return often means an expense was missed, not that you found a unicorn.

Cash-on-cash return isn't your total return

This is worth being clear-eyed about: cash-on-cash return only measures the cash hitting your account each year. It leaves out two other ways rental property makes you money:

Principal paydown: every mortgage payment includes some amount going toward the loan balance, not just interest. That's real equity building up, even though it never shows up as cash in your pocket.
Appreciation: if the property's value goes up over time, that's additional return, but it's unrealized until you sell or refinance, and it's the least predictable of the three.

Cash-on-cash return is the right number to focus on if you're evaluating whether a deal supports itself day to day, which is exactly why it's the number most first-time investors should anchor on. Just don't mistake it for the full picture of what the property is actually worth to you over a 10-year hold.

The part most beginners get wrong

People forget to fully load their expenses: vacancy allowance, a maintenance reserve, and property management. Even if you plan to self-manage, price it in, because your time isn't free. Skipping these makes every deal look better than it actually is. That's how first-time investors end up disappointed six months in.

A second common mistake: using the listing's advertised rent instead of a real, independently checked rent estimate. A deal that looks like a 10% cash-on-cash return on paper can quietly turn into 4% once you plug in what the unit will actually rent for.

Frequently asked questions

Is a higher cash-on-cash return always better? Not automatically. An unusually high number is often a red flag that an expense got missed (maintenance, vacancy, property management) rather than a genuinely exceptional deal. Always double-check the inputs before trusting a number that looks too good.

Does cash-on-cash return include mortgage principal paydown? No. It only measures actual cash collected minus cash spent. Principal paydown is real value, but it's a separate return stream, not part of this number.

What's a bad cash-on-cash return? Anything meaningfully below your own target, commonly under 6-8% for most buy-and-hold investors, though this depends heavily on your market and goals. A negative number means the property loses money every month before you've even accounted for repairs or vacancy, which is a clear pass in most cases.

This is exactly the kind of calculation we run automatically, every night, against every new listing in your target market. So you're not doing this math by hand for every property you come across.