Cap rate describes the property. Cash-on-cash return describes your deal. The gap between them tells you whether your financing helps or hurts.
DealWorthIQ Team · 2026-09-21
Cap rate and cash-on-cash return are the two numbers rental investors quote most, and they are often confused. They answer different questions, and the difference between them is one of the most useful signals in a deal.
Cap rate is net operating income divided by the property's price or value. It ignores financing entirely, which is what makes it useful for comparing properties and markets on equal terms.
Cap rate = NOI ÷ property value × 100
A property priced at $400,000 that produces $28,000 of NOI (rent minus vacancy and operating expenses, before any mortgage payment) has a 7.0% cap rate.
Cash-on-cash return divides your annual pre-tax cash flow, after the mortgage, by the cash you actually put in. It is the number that tells you what your money is earning.
Cash-on-cash return = annual cash flow after debt service ÷ total cash invested
Buy that same property with 25% down ($100,000) plus $12,000 in closing costs, so $112,000 of cash. The $300,000 loan at 7% over 30 years costs about $1,996 a month, or $23,951 a year. Cash flow is $28,000 − $23,951 = $4,049, a cash-on-cash return of 3.6%.
The loan costs 7% and the property earns 7% before financing. When the cost of debt is at or above the cap rate, leverage stops boosting your return and starts diluting it. This is called negative leverage. When the cap rate is comfortably above your borrowing cost, the opposite happens and cash-on-cash return climbs above the cap rate.
The same example shows up in a third metric. NOI of $28,000 against $23,951 of debt service is a DSCR of 1.17, below the 1.20 to 1.25 many lenders look for. A lender may ask for a bigger down payment, which would lower the loan payment but also spread the cash flow over more of your money.
Cap rate calculator: Walk through NOI, cap rate, and implied property value on a sample deal.