Why cash-on-cash is the metric that matters.
You can compare deals by gross rent multiplier, cap rate, GRM, or a dozen other metrics. But the one that answers "what is this deal actually earning my money?" is cash-on-cash return. It strips away accounting fictions and tells you the cash, in your hand, divided by the cash you put down.
That is why every experienced rental investor opens with CoC. It is honest, comparable across markets, and immediately stress-testable.
Cash-on-cash vs cap rate — when each one wins.
Cap rate is a property-quality metric. It ignores financing and answers "if I paid all cash, what would this property yield?" Use cap rate when you are comparing markets, evaluating commercial deals, or you actually intend to pay cash.
Cash-on-cash is a leverage-aware metric. It answers "with my financing, what is my money earning?" Use CoC when you are financing the property, comparing your equity efficiency, or deciding between a higher down payment and a lower one.
Sophisticated investors track both. A high cap rate with a low CoC is a warning sign that financing is barely working. A low cap rate with a high CoC means leverage is doing the heavy lifting — fine in good times, brutal in bad ones.
What 8%, 10%, and 12% actually mean.
8% CoC is the soft floor for a stabilized rental in most US markets in 2026. Below 8% and you are probably betting on appreciation or paying for an emotional reason. Above 8% suggests the deal is working on cash flow alone.
10% CoC is the comfortable middle. This is where most cash-flow-focused investors aim. You have a buffer for surprise expenses, the deal works without appreciation, and you are getting a real return on your capital.
12%+ CoC is excellent — but verify the numbers. Are you using realistic vacancy and maintenance reserves? Are taxes and insurance accurate? Many "12% deals" become 7% deals once expenses are honest. If the numbers hold up, you have a winner.
How leverage shapes cash-on-cash.
Lowering your down payment from 25% to 20% almost always raises your CoC — because the denominator shrinks faster than the cash flow. But that extra leverage also makes the deal more fragile to rate changes, vacancies, and expense overruns.
Conversely, paying all cash typically gives the lowest CoC but the safest cash flow. Many investors split the difference: 20–25% down, then let cash flow pay the loan down over time.
Use the calculator above to see the trade-off in your specific deal. The "all-cash vs 20% down vs 25% down" comparison row exists for exactly this reason.
Five mistakes that ruin a cash-on-cash projection.
- Skipping closing costs and rehab in the denominator — instantly inflates CoC by 15–25%.
- Using a 0% vacancy reserve. Even a great unit turns over every 2–3 years.
- Forgetting property management even if you self-manage. Your time has a cost.
- Underestimating maintenance. Use 1–2% of property value per year as a floor.
- Ignoring CapEx reserves. Roofs and HVACs do not last forever — set aside 5–10% of rent.