What each metric actually measures
Each number isolates a different part of the deal.
Cap rate is net operating income divided by price. It ignores financing, which makes it a clean way to compare the earning power of properties regardless of how you pay for them.
Cash-on-cash return divides annual pre-tax cash flow by the cash you actually invested, so it does include financing. The 1% rule is not a return metric at all — it is a fast screen that asks whether monthly rent is at least 1% of price.
- Cap rate: income yield on price, ignoring your loan.
- Cash-on-cash: return on the cash you actually put in.
- 1% rule: a quick screen, not a measure of return.
When to lean on which
Match the metric to the decision in front of you.
Use cap rate to compare properties or markets on equal footing, before financing muddies the picture. Use cash-on-cash to judge how hard your specific down payment and loan are working on a specific deal.
Use the 1% rule only to triage a list quickly. It is a filter to decide what deserves a full underwrite, never the basis for an offer.
Why financing splits cap rate from cash-on-cash
The same property can show a modest cap rate and a strong cash-on-cash return, or the reverse.
Because cap rate ignores debt and cash-on-cash includes it, leverage is what drives them apart. Cheap, well-structured financing can lift cash-on-cash well above the cap rate; expensive financing can drag it below.
That is why two investors buying the identical property can report very different cash-on-cash returns. Their cap rate is the same; their financing is not.
Do not compare across metrics
Comparing one property’s cap rate to another’s cash-on-cash tells you nothing. Pick a metric, then compare deals on that same metric.