The cash on cash return formula
The cash on cash return (also called cash yield or CoC) answers one question: for every dollar of my own money locked in this deal, how many dollars of spendable income does it throw off each year? It is the metric leveraged investors quote to each other, because it is measured on actual cash at risk — not on the whole property value.
The formula in full: annual pre-tax cash flow = (monthly rent + other monthly income − monthly operating expenses − monthly mortgage payment) × 12. Total cash invested = down payment + closing costs + upfront renovation. Cash on cash return = annual pre-tax cash flow ÷ total cash invested × 100.
A worked example you can verify by hand. Purchase price $300,000 with 20% down ($60,000), a 30-year loan at 6.5% on $240,000 gives a monthly payment of $1,517. Monthly rent $2,400 and other income $50, minus $500 of operating expenses and the $1,517 payment, leaves $433 of monthly cash flow — $5,196 per year. Add roughly 2% closing costs ($6,000) and the total cash invested is $66,000. That is a 7.87% cash on cash return.