Cap rate vs ROI on a rental property
Cap rate is a snapshot: one year of income, no financing, no growth. ROI is the whole picture over a hold period — cash flow plus principal paydown plus appreciation, net of selling costs. A property can have a mediocre cap rate and a strong ROI, and the reverse.
Side by side
| Cap rate | Total ROI | |
|---|---|---|
| Formula | NOI ÷ property value | (Cash flow + principal paydown + appreciation − selling costs) ÷ cash invested |
| Includes | One year. Operating only. | The full hold period, financing, growth and exit. |
| Use it for | Is this priced fairly against comparable buildings? | What did this investment actually return? |
Why the difference matters
Most of the return on a leveraged rental over five years does not come from the cap rate. It comes from the tenant paying down your loan and from the value moving. Judging a deal on cap rate alone ignores the two largest components.
The mistake to avoid
Assuming appreciation. Principal paydown is contractual and you can count on it. Appreciation is a forecast, and a model that needs 3% a year to work is a model that fails in a flat market. Set it to zero and see whether the deal still stands up.
Worth knowing
- Cap rate is annual and unlevered. ROI is cumulative and levered.
- Principal paydown and appreciation appear in ROI only — never in cap rate, never in cash-on-cash.
- Selling costs are real: budget around 7% of the sale price.
- IRR is ROI with the timing of the cash flows taken into account, which matters over a long hold.