Summary: A $300,000 rental at $2,400 monthly rent, 5 percent vacancy, $700 monthly expenses, 25 percent down, and a 7 percent 30-year loan: $84,000 cash invested, $996 annual cash flow, 1.2 percent cash-on-cash return, 6.3 percent cap rate. Raising rent 10 percent lifts cash-on-cash to 4.5 percent; a 5 percent rate lifts it to 5.3 percent. Small input changes move the answer more than most investors expect.
Formulas are clean; deals are messy. This guide runs one realistic deal through the complete cash-on-cash calculation, line by line, then stress-tests it against the three inputs investors most often get wrong: rent, rate, and expenses.
Purchase price: $300,000. Down payment 25 percent: $75,000. Closing costs: $9,000. Total cash invested: $84,000. Loan: $225,000 at 7 percent over 30 years, for a monthly P&I payment of $1,497 ($17,964 per year).
Gross rent: $2,400 per month, or $28,800 per year. Vacancy at 5 percent: $1,440. Effective gross income: $27,360. Operating expenses at $700 per month: $8,400 per year (taxes, insurance, maintenance, management). Net operating income: $18,960. Subtract annual debt service of $17,964 and annual pre-tax cash flow is $996.
Cash-on-cash return: $996 divided by $84,000 equals 1.19 percent. Cap rate: $18,960 divided by $300,000 equals 6.32 percent. The property is fairly priced as an asset and thin as a financed investment at 7 percent rates, which is exactly the negative-leverage dynamic the previous guide describes.
Raise rent 10 percent to $2,640: effective income rises to $30,096, NOI to $21,696, cash flow to $3,732, and cash-on-cash to 4.4 percent. One rent adjustment quadruples the return. Drop the loan rate to 5 percent: debt service falls to about $14,520, cash flow rises to $4,440, cash-on-cash to 5.3 percent. Refinancing is the highest-ROI activity available to this deal.
Raise expenses 20 percent to $840 monthly ($10,080 annually): NOI falls to $17,280, cash flow goes negative to -$684, and cash-on-cash turns negative. This is why expense underwriting matters more than most beginners think: a $140 monthly expense miss wipes out the entire cash return. Stress-test every deal at 10 percent lower rent and 20 percent higher expenses; if it survives, it is a deal.
Three cash lines routinely go missing from pro formas. Capital expenditures: roofs, HVAC, and appliances are not maintenance, they are lumpy capital costs that average 5 to 10 percent of rent annually over time. Leasing costs: tenant turnover consumes a month of rent plus make-ready costs, which is why the 5 percent vacancy assumption understates true turnover economics. Your time: self-management is a job, and pricing it at zero inflates every return metric on the page.
Add a capex reserve of 8 percent of gross rent ($2,304 here) and the base-case cash flow goes from $996 to negative $1,308. That does not kill the deal; it reprices it honestly. The investors who survive long-term are the ones whose spreadsheets told the truth before closing.
Cash-on-cash is the down payment on the full return picture. On the base-case deal, add the missing wealth builders: principal paydown of roughly $2,400 in year one, appreciation at a conservative 3 percent ($9,000 on $300,000), and depreciation tax benefits worth perhaps $3,000 to $5,000 depending on your bracket. Total first-year wealth creation approaches $15,000 on $84,000 invested, near 18 percent, even though cash-on-cash shows 1.2 percent.
This cuts both ways. Total return is the intellectually honest metric, but only cash-on-cash pays the mortgage when the water heater fails. Underwrite the deal on cash flow to make sure you survive; evaluate it on total return to decide whether the survival is worth it.
Verify every cash-on-cash calculation with two sanity checks. First, cash flow plus debt service must equal NOI: $996 plus $17,964 equals $18,960 here. Second, cash invested plus loan must equal price plus closing: $84,000 plus $225,000 equals $309,000, the $300,000 price plus $9,000 closing. If either identity fails, a line is missing or double-counted. These two checks catch most spreadsheet errors before they become investment decisions.
Compute effective rental income (gross rent minus vacancy), subtract operating expenses to get NOI, subtract annual mortgage payments to get cash flow, then divide cash flow by total cash invested (down payment + closing + rehab cash).
Five to 10 percent is standard for underwriting stabilized rentals. Use higher assumptions for C-class properties, high-turnover markets, and single-family rentals with longer re-lease times.
Yes, as a reserve. Budget 5 to 10 percent of gross rent annually for lumpy capital items (roof, HVAC, appliances). Excluding capex is the most common way pro formas overstate cash-on-cash.
Very. On the $300,000 example, moving from 7 to 5 percent lifts cash-on-cash from 1.2 to 5.3 percent. Rate changes move leveraged returns far more than rent changes of the same proportion.
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Figures: 2026. Sources: standard real estate investment references and lender program guides. This page is for planning only and is not financial, tax, or legal advice. Verify with the cited source or a qualified professional.