What does cash-on-cash return mean?
It is the simplest question you can ask about a rental: of the money I actually put in, how much came back this year? The formula is easy. Both halves of it are easier to get wrong than they look.
Cash-on-cash return = annual pre-tax cash flow ÷ total cash invested.
It measures your money, not the property. Two investors buying the same building on the same day compute the same cap rate and completely different cash-on-cash returns, because they put in different amounts of their own cash and took on different payments.
It is a single-year, pre-tax, cash measure. Each of those three words is a limit, and the rest of this page is mostly about them.
The numerator: what counts as cash flow
Annual pre-tax cash flow is net operating income minus annual debt service. Start from NOI — rent collected after vacancy, less the real costs of running the building — and take the mortgage out of it.
The reliable way to get this wrong is to start from gross rent instead of NOI. Rent minus mortgage is not cash flow; it is rent minus mortgage. Taxes, insurance, management, maintenance, turnover and reserves all happen whether or not they appear in the calculation, and a number that skips them describes a property nobody owns.
The denominator: what counts as cash invested
Everything that left your account to get the property producing income:
- the down payment
- closing costs — lender fees, title, escrow, inspection, and any points
- up-front repairs and turnover before the first tenant moved in
- prepaid escrows and any holding costs while the place sat empty
This is where the number can get flattered, and not by dishonesty — the down payment is one memorable figure and the rest are scattered across a closing statement. Omitting the last three shrinks the denominator and lifts the return, which is why the calculator collects them as separate fields rather than asking for one total.
One thing that does not belong in it: the purchase price. Dividing cash flow by the price is a different calculation with a different meaning, and it is not cash-on-cash return.
What is a strong cash-on-cash return?
There is no universal figure, for the same reason there is no universal cap rate — the number that would justify a deal depends on what else you could do with the money and how much risk you are taking to earn it. What you can do is compare it against three specific things.
- What the cash would earn without property risk. The long-dated Treasury yield, published as the Daily Treasury Par Yield Curve Rates, is the floor your deal has to clear before the work and the risk are worth anything. A levered rental returning less than that is asking you to take tenants, repairs and illiquidity for a discount.
- The same deal with no loan. If the financed version returns less than the all-cash version, the debt is costing more than the building earns, and the leverage is working against you. That comparison is the subject of the cap rate versus cash-on-cash page.
- The version of this deal you would accept. Run it at the down payment, rate and rent you actually expect, then again at the ones you are afraid of. A return that only survives the optimistic set is a forecast, not a measurement.
A figure someone quotes as the number to beat may well be describing a different market, a different asset and a different rate environment than yours.
What it leaves out
Cash-on-cash reports one component of a levered return. Here is the same deal with the component it ignores set beside it — the same property and the same financing as the third column on the comparison page, which shows a negative cash-on-cash return.
Scroll the table sideways to see every column.
| Year one | Amount | On cash invested |
|---|---|---|
| Net operating income | $36,000 | — |
| Annual debt service | $36,838 | — |
| Cash flow | -$838 | -0.5% |
| Interest paid | $32,482 | — |
| Principal repaid | $4,355 | 2.7% |
| Cash flow and principal together | $3,518 | 2.2% |
On a cash basis the year is slightly negative. On the same year, the tenant also repaid part of the loan, and that repayment is real: the debt is smaller than it was and the owner's equity is larger by the same amount.
But it is not cash. Principal paydown cannot pay for a new roof, cover a vacancy, or buy anything at all until the property is sold or refinanced. Treating it as though it offsets negative cash flow is how people end up owning an asset that is worth more each year and cannot fund its own water heater. Both figures are true; only one of them spends.
Two further components sit outside this table: appreciation and tax treatment. Neither is calculated anywhere on this site, because both require assumptions — a growth rate, a marginal rate, a holding period — that would have to be invented to produce a number. A calculator that supplies them is supplying you with its guesses wearing the clothes of arithmetic.
Why year one is not the whole picture
Cash-on-cash is often quoted for the first year alone. On fixed-rate debt the payment stays the same while rents can move with the market, so a later year can look quite different from the first — and the principal share of each payment rises every year too.
That cuts both ways. Expenses can rise too, a year with a turnover and a major repair can erase the cash flow of a good one, and nothing about a first-year figure promises the next. It is a snapshot of one year, which makes it useful and makes it partial.