NOI vs Cap Rate vs Cash-on-Cash: Which Return Metric to Use

Real estate investors use several return metrics interchangeably, but they actually measure different things. NOI is a dollar figure, cap rate is a percentage, gross yield ignores vacancy, net yield matches cap rate, and cash-on-cash return only makes sense for financed deals. This article explains when to use each one and walks through the same property producing four different "return" numbers depending on the metric.

Quick Comparison Table

What NOI Tells You (And What It Doesn't)

NOI is a dollar figure: the property's annual income after vacancy and operating expenses, but before financing. It's the building block for cap rate, valuation, and lender underwriting.

NOI answers: "How much money does this property generate from operations?"

NOI does NOT answer: "Is this a good deal?" (that's cap rate's job), "Will I make money?" (that's cash-on-cash's job), or "Is this property worth the asking price?" (that requires cap rate or DCF).

Two properties can have the same NOI but wildly different cap rates. A $50,000 NOI on a $500,000 property is a 10% cap (probably a deal); the same $50,000 NOI on a $1,500,000 property is a 3.3% cap (probably overpriced). NOI alone tells you nothing about value.

What Cap Rate Tells You (And What It Doesn't)

Cap rate is the unleveraged yield on the property — the annual return as a percentage of the total purchase price. It's the metric used to compare properties on an apples-to-apples basis because it ignores financing (which varies by buyer).

Cap rate answers: "What's the inherent yield profile of this property, ignoring how it's financed?"

Cap rate does NOT tell you: "What's my actual return on the cash I put in?" (that's cash-on-cash), "Can I afford the mortgage?" (that's DSCR or debt service coverage), or "Is this cap rate sustainable?" (that's underwriting judgment based on submarket fundamentals).

The leverage-blindness is the key limitation. A 5% cap rate on a property bought all-cash is a 5% return. The same 5% cap rate on a property bought with 80% leverage at 7% interest generates negative cash flow. Cap rate doesn't care about financing; cash-on-cash does.

What Gross Yield and Net Yield Tell You

Gross yield is the simplest screen: gross rent ÷ property value × 100. It ignores vacancy and operating expenses, which makes it imprecise — every property looks better on gross yield than on net yield.

Gross yield answers: "Is this property in the right yield ballpark at all?" Use it for first-pass screening of a large pipeline of listings. If a property is at 4% gross yield, it's likely a low-cap deal — move on or underwrite carefully. If it's at 12% gross yield, dig in — either it's a deal or there's a problem.

Net yield is the same formula as cap rate (NOI ÷ property value × 100), just with different terminology. "Net yield" is the standard term in residential real estate and in international markets (UK, Australia, Singapore). "Cap rate" is the standard in US commercial real estate. They produce identical numbers from identical inputs.

What Cash-on-Cash Return Tells You

Cash-on-cash return measures the actual annual cash flow as a percentage of the cash you invested. It includes financing, which makes it the most relevant metric for personal portfolio decisions.

Cash-on-cash answers: "What return am I getting on the cash I actually put in?"

Cash-on-cash does NOT tell you: "Is this property a good buy?" (a high CoC with a 4% cap on the property itself is likely a fragile deal), "What's the total return including appreciation?" (you'd need IRR or equity multiple), or "How does this compare to other properties?" (use cap rate for that).

When financing is favorable (low rates, high leverage, low-cap property in a growth market), cash-on-cash return can dramatically exceed cap rate. A 5% cap rate property with 75% leverage at 5% interest can produce 12%+ cash-on-cash. When financing is unfavorable (high rates, low leverage), cash-on-cash can be lower than cap rate — or even negative.

Which Metric to Use When

Four common scenarios, with the right metric for each:

1. Comparing multiple properties in different markets. Use cap rate. It's the only metric that strips out financing and lets you compare inherent yield profile. If two properties in two cities have similar cap rates but different cash-on-cash returns, the difference is financing — not the property.
2. Deciding whether to finance a deal. Use cash-on-cash. This is the metric that tells you what you're actually earning on your out-of-pocket cash at different leverage levels. Run the numbers at 25%, 50%, and 75% LTV and see where your return maximizes.
3. Negotiating the purchase price. Use cap rate. Calculate what cap rate the asking price implies and compare to the submarket range. Your offer should anchor to a cap rate that matches comps.
4. Calculating total return to a partner or LP. Use cash-on-cash for current-year distributions, but pair with IRR and equity multiple for the full picture. Cap rate doesn't capture appreciation; cash-on-cash doesn't capture exit.

The Common Confusion: Cap Rate vs Yield

Cap rate and net yield are the same number with different names. If someone tells you a property has a "5.5% cap rate" and another investor calls it a "5.5% yield," they're describing the same metric.

Where the confusion arises: gross yield looks similar but is calculated differently (using gross rent, not NOI). If a listing says "10% yield," the question is whether they mean gross or net. Always ask. The difference between the two is vacancy plus operating expenses — which is typically 30-40% of gross rent for residential. A 10% gross yield might be a 6% cap rate after the math.

Worked Example: Same Property, Four Different Numbers

Consider a duplex bought at $400,000 with $36,000 annual gross rent, 5% vacancy, and $12,000 operating expenses.

Income and expense math:

• Effective Gross Income (EGI) = $36,000 × 0.95 = $34,200
• NOI = $34,200 − $12,000 = $22,200

Unleveraged returns (all-cash purchase):

• Gross Yield = $36,000 ÷ $400,000 × 100 = 9.00%
• Net Yield = $22,200 ÷ $400,000 × 100 = 5.55%
• Cap Rate = same as net yield = 5.55%

Leveraged returns (75% LTV at 6.75% interest, 30-year term):

• Down payment = $100,000 (25%)
• Loan amount = $300,000
• Annual debt service = ~$23,350
• Annual cash flow = $22,200 − $23,350 = −$1,150
• Cash-on-Cash = −$1,150 ÷ $100,000 × 100 = −1.15%

Same property, four different "return" numbers: 9% (gross yield), 5.55% (net yield / cap rate), and −1.15% (cash-on-cash). The first two ignore financing and vacancy; the third captures everything. None of them are wrong — they answer different questions.

Use our free Cap Rate Calculator to model these scenarios with your own numbers and see how each metric shifts with different inputs.

Frequently Asked Questions

Is cap rate the same as yield?

Cap rate and net yield are mathematically identical (NOI ÷ property value × 100). The terms come from different markets: "cap rate" is the standard US commercial real estate term, while "yield" is more common in residential and international markets (UK, Australia). The distinction is purely semantic — they produce the same number.

Which is more important: cap rate or cash-on-cash?

Both matter, but they answer different questions. Cap rate tells you the unleveraged yield of the property itself — useful for comparing deals and market analysis. Cash-on-cash tells you the actual return on your out-of-pocket cash — useful for personal portfolio decisions. Use cap rate to screen deals, then use cash-on-cash to decide whether the financing works for you.

Why is my cash-on-cash negative but cap rate positive?

Because debt service exceeds NOI. If your annual mortgage payment is higher than the property's NOI, you're feeding the property every month before any cash flow hits your account. This happens when interest rates are high relative to cap rates, or when you've taken on too much leverage. A positive cap rate with negative cash-on-cash means the property is sound but the financing isn't.

Should I use gross yield or net yield for screening?

Use gross yield only for a quick first-pass screen (it ignores vacancy and expenses, which makes it imprecise). For actual evaluation, use net yield (or cap rate — same thing). If you can only remember one number, use net yield / cap rate.

Disclaimer: This article provides general educational information about real estate return metrics. Calculations and examples are illustrative. Actual numbers depend on specific properties, financing terms, and market conditions. Nothing here is investment advice or a recommendation. Always consult a licensed real estate professional before making investment decisions.