Cash-on-cash return answers one narrow question: for every dollar of your own money that went into this deal, how many cents come back each year as cash flow? It ignores appreciation, loan paydown and tax effects. That narrowness is its strength — it measures the cash the property actually pays you — and its weakness: a deal can have a fine cash-on-cash return and still be a mediocre investment, or a poor one and still build equity. Use it as a screening number, not a verdict.
On this page
The formula
Annual pre-tax cash flow is what is left after everything: effective rent (rent minus vacancy), minus operating expenses (taxes, insurance, maintenance, management, CapEx reserve), minus the mortgage payment.
Total cash invested is every dollar you put in to own the property: down payment, closing costs, loan fees, and any rehab you paid for before the property started producing rent. This is where most published examples quietly cheat — they divide by the down payment alone and call closing costs free. They are not.
Worked example: a deal with a negative return
This is the sample deal pre-loaded in our analyzer, and it fails on purpose — an honest screening tool has to be able to say "walk away."
| Input | Value |
|---|---|
| Purchase price | $250,000 |
| Rent | $1,800 / month |
| Down payment | 20% ($50,000) |
| Loan | 7%, 30 years |
| Results | |
| NOI | $12,432 / year |
| Cap rate | 5.0% |
| Cash flow | −$294.60 / month (−$3,535 / year) |
| Total cash invested | ≈ $55,200 (down payment + closing costs) |
| Cash-on-cash return | −6.4% |
Yellow = inputs · Green = calculated
The arithmetic is simple: −$3,535 ÷ $55,200 = −6.4%. Every year, this property takes about six cents per invested dollar out of the owner's pocket instead of paying anything back.
Why this deal's cash-on-cash is negative
Three facts combine against it:
- The rent is too low for the price. At $1,800 a month on a $250,000 purchase, the gross rent is 0.72% of the price per month. After vacancy and full expenses, NOI is $12,432 — a 5.0% cap rate.
- The debt costs more than the property yields. The mortgage payment is about $1,331 a month ($15,967 a year). Debt service exceeds NOI by $3,535 a year — exactly the negative cash flow. When the cap rate (5.0%) is below the effective cost of the loan, leverage works against you instead of for you.
- Break-even rent is far away. This deal needs roughly $2,180 a month — $380 more than it gets — just to reach a cash flow of zero, let alone a positive return.
Nothing here is a modeling error. The deal is simply priced too high for the rent it produces at a 7% interest rate.
The levers that change cash-on-cash
- Price. The strongest lever. At a lower purchase price, both the loan and the payment shrink while the rent stays the same. This is why the number belongs in your hands before you negotiate.
- Rent. Higher rent — a below-market unit brought to market, a value-add renovation — flows almost directly into cash flow. Verify it against real comparable listings, not the seller's projections.
- Down payment. More cash down means a smaller payment and better monthly cash flow, but also a bigger denominator. Cash-on-cash can go either way; run both versions instead of assuming.
- Rate and term. A lower rate, or a rate buydown, cuts debt service directly. At the margins, a point of rate can matter more than a point of price.
- Expenses. Shopping insurance, appealing a tax assessment, or self-managing instead of paying a manager all raise NOI. Just don't "save" money by deleting the vacancy or CapEx lines — that changes the spreadsheet, not the property.
What "good" actually means
There is no official threshold. You will see figures like 8–12% quoted in forums and videos as if they were standards; treat them as folklore, not benchmarks. A cash-on-cash return is only meaningful against three comparisons:
- Your alternatives. What would the same cash earn in an index fund or a high-yield account, at what risk and effort?
- The whole return picture. Cash-on-cash excludes principal paydown, appreciation and tax benefits. A low-CoC deal in a strong market can still build wealth — but then say so explicitly, and don't let the spreadsheet call it a cash-flow deal.
- Your own requirement. Decide the minimum return your time and risk demand before you look at listings. A deal that clears your bar is a candidate; one that doesn't is a pass, regardless of what anyone else would accept.
Common mistakes
- Dividing by the down payment only. Closing costs, loan fees and upfront rehab are cash invested. Leaving them out inflates the return.
- Using scheduled rent instead of effective rent. Vacancy is a cost whether you budget it or not.
- Deleting the CapEx reserve. Roofs and HVAC systems do not invoice monthly, but they always invoice eventually.
- Comparing CoC across different leverage. A 20%-down deal and a 5%-down deal are different risks; the same CoC number does not mean the same thing.
- Trusting the seller's expense figures. Taxes reset, insurance reprices, and "the owner manages it free" is not an expense structure you inherit.
Run your own numbers
The free Lite version of the Real Estate Deal Analyzer computes cash-on-cash — with total cash invested, vacancy and a separate CapEx reserve — on one sheet. When you want the rest of the picture, the Full version adds a sensitivity grid, a 5-year projection with IRR, a BRRRR calculator and a 3-deal comparison. Both are on the Real Estate Deal Analyzer page.
Lite first, free — the Full version is the same workbook with the deeper sheets unlocked.
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This guide is an educational calculation aid, not financial, tax or legal advice. Verify all figures against local data before making an offer.