Ask a room of investors which metric matters most and you will start an argument. The truth is that cap rate and cash-on-cash return answer completely different questions, and using the wrong one for your situation leads to bad offers on good properties — or worse, good offers on bad ones.
Cap Rate: The Property's Report Card
Cap Rate = NOI ÷ Purchase Price
Cap rate measures the unlevered return — what the building earns as a percentage of its price if you paid all cash. Because it ignores financing, cap rate describes the property in the market, not your personal deal.
Example: A fourplex produces $32,000 NOI and lists for $530,000.
- Cap rate = $32,000 ÷ $530,000 = 6.0%
When Cap Rate Is the Right Tool
- Comparing properties across markets or to each other — financing differs, buildings do not
- Estimating value: Value = NOI ÷ market cap rate. If area cap rates are 6% and your NOI is $32,000, income supports ~$533,000
- Assessing risk: higher cap rates generally signal more risk (worse area, older building, weaker tenants); lower cap rates signal stability and appreciation expectations
- Commercial lending: lenders size loans off NOI
When Cap Rate Misleads You
- It ignores leverage entirely. A 5% cap property with cheap, fixed debt can outperform a 7% cap property with expensive variable debt.
- It ignores your capital improvements and closing costs.
- On 2-4 unit properties, sales are still partly comp-driven, so "market cap rates" are fuzzier than in commercial.
Cash-on-Cash Return: Your Money's Report Card
CoC = Annual Pre-Tax Cash Flow ÷ Total Cash Invested
Cash-on-cash measures what your actual dollars earn after financing — the metric for a leveraged investor.
Example: Same fourplex, but you put 25% down plus closing costs:
- Cash invested: $132,500 down + $15,000 closing = $147,500
- Annual debt service: $28,400
- Cash flow = $32,000 NOI − $28,400 = $3,600
- CoC = $3,600 ÷ $147,500 = 2.4%
Notice: a healthy 6% cap rate produced a weak 2.4% cash-on-cash because the debt cost nearly ate the spread. That tension is exactly why you need both numbers.
When Cash-on-Cash Is the Right Tool
- Deciding whether to buy a specific deal with your specific financing
- Comparing real estate against stocks, bonds, or savings on a cash-yield basis
- Evaluating value-add plays: will $30,000 of renovations raise rents enough to move CoC from 3% to 9%?
The Quick Decision Framework
| Question | Use |
|---|---|
| Is this building priced fairly vs. others? | Cap rate |
| Will this deal make me money with my loan? | Cash-on-cash |
| What could I sell it for in 5 years? | Cap rate (on projected NOI) |
| Should I pay all cash or leverage? | Both |
| Does it qualify for a DSCR loan? | NOI vs. debt service (DSCR) |
Rules of Thumb for 2-4 Unit Properties
- In most Midwest/Southeast markets, 6-8% cap rates are common for small multifamily; coastal metros often trade at 4-5%.
- A cash-on-cash return of 8-12% is a solid target for a leveraged small multifamily purchase; below 4-5%, you are relying entirely on appreciation and paydown.
- If cap rate is below your mortgage interest rate, leverage will reduce your cash flow — the deal must be justified by appreciation, amortization, or rent growth.
Calculate Both Instantly
Our Multifamily Cash Flow & NOI Calculator outputs cap rate and cash-on-cash return side by side, so you can see exactly how your loan terms convert a property's cap rate into your personal return.