Cash-on-Cash Return

What cash-on-cash measures

Cap rate, covered in Normalized NOI & Cap Rate, measures the asset. Cash-on-cash measures your deal. It's the first metric that knows how you paid for the property, and it answers a simple question: for the cash I actually put in, how much cash did the property pay me back this year? The formula is annual pre-tax cash flow ÷ total cash invested: a levered, one-year cash yield on your own money.

The denominator: every dollar you put in

Both halves of that fraction are places people go wrong, and both errors usually point the same way: a prettier number than the deal deserves. Start with the one people get wrong most often: the denominator. "Total cash invested" means every dollar of cash the deal required to get to day one, not just the down payment. Down payment, closing costs, any upfront repairs or rehab, and any reserves you had to fund at closing all belong in it. Leave out the $5,000 of closing costs and, on a deal that earns cash, your return looks bigger on the same cash flow, but you didn't actually invest less; you just hid part of what you put in. A return means nothing until every dollar you put in is in the denominator.

The numerator: cash flow after the reserve

Now the numerator, and it has its own discipline. It is not "NOI minus the mortgage." It's pre-tax cash flow after reserve = NOI − debt service − CapEx reserve. The CapEx reserve (the money you set aside for the roof, the HVAC, the big-ticket replacements that don't happen every year) is a real economic cost, so it belongs in the cash flow you measure your return against. Skip it and you'll report cash the property didn't really free up, because you're pretending the future replacements are someone else's problem. (One distinction to keep straight: reserving for CapEx is an economic cost in this calculation, not a bookkeeping or tax deduction: you deduct a repair when it is spent, and recover an improvement through depreciation once it is in service, and whether a particular cost is a repair or an improvement is a facts-and-circumstances question for your own tax professional. That is a separate question entirely.)

The example rental, run through it

Put the example rental these guides use through it; it is an illustration, and its full assumption set is listed in The Operating-Expense Build & the 50% Rule. Pre-tax cash flow after reserve in Year 1 is −$913: that's NOI $15,516, minus debt service $15,109, minus the $1,320 CapEx reserve (5% of gross potential rent). Cash invested is $75,000: $70,000 down (25% of $280,000) plus $5,000 in closing. So cash-on-cash = −$913 ÷ $75,000 ≈ −1.2%. The property costs its owner a little money in year one. That's not a broken deal; it's a fairly stated one, a near-break-even buy-and-hold shown after a real reserve, exactly as designed.

Why it sits below the cap rate here

Which raises the obvious question: cap rate on this same deal was +5.5%, so why is cash-on-cash so much lower? Because cash-on-cash includes financing, and here the financing costs more than the asset yields. The loan's annual debt-service constant (required debt service ÷ original loan balance) is about 7.2% ($15,109 ÷ $210,000), while the property's unlevered yield (its yield before any loan) is only 5.5%. When the debt-service constant exceeds the property's unlevered yield, leverage works against you: it pulls the levered cash return below the asset yield.

Be precise about what does what, though: on this deal NOI still exceeds debt service by $407 ($15,516 − $15,109). Negative leverage has depressed the return, but it hasn't by itself made the cash flow negative; it's the additional $1,320 CapEx reserve that takes pre-tax cash flow after reserve to −$913 and cash-on-cash to about −1.2%. There are three separate effects: asset economics (the 5.5% cap), the financing effect (negative leverage, still leaving +$407), and the reserve (what tips this particular deal below zero). (How leverage amplifies returns in both directions is covered in Leverage.)

What cash-on-cash does not tell you

Two boundaries, so cash-on-cash doesn't get asked to do another metric's job. First, it's pre-tax and one-year. It says nothing about the tax treatment of that loss (that question is worked through in The Passive Activity Framework) and nothing about principal paydown or appreciation; those build wealth but aren't cash the property handed you this year. A negative cash-on-cash in year one can sit on top of real equity growth; they're different questions.

Second, don't confuse cash-on-cash with cash return on current equity. Cash-on-cash divides by the cash you invested (fixed at purchase) and answers "how's my original money doing?" Cash return on current equity divides by your current market equity (which grows as you pay down and the property appreciates) and answers "is my built-up equity still working hard enough to keep here?" Same numerator, different denominator, different decision. It is taught in Cash Return on Current Equity & the Wealth Engines.

Cash-on-cash is your annual cash return on the money you actually put in: pre-tax cash flow after reserve over every dollar invested (closing and upfront costs included). Fudge either half and the number lies in your favor. Build both carefully and you get what the example rental shows: about −1.2% in year one, which is exactly what a near-break-even rental looks like before rent growth and paydown go to work.