Cap Rate vs IRR

The cap rate, short for capitalization rate, is the first number a broker quotes and the first number a buyer should distrust. The cap rate vs IRR comparison is not a contest between two versions of the same thing, but it is NOI divided by price, nothing more. NOI is net operating income, the cash flow before debt service and before income tax. The price is what you actually pay, not what the appraisal says. If a building throws off $100,000 in NOI and you pay $1,000,000, the cap rate is 10%. That is the entire definition. It is a snapshot of current yield, not total return. It ignores financing, taxes, and future appreciation. Newcomers mistake it for a measure of total profit. It is actually a measure of risk and unlevered return that must be compared against a dated, market-specific benchmark to be useful.

IRR, the internal rate of return, is the answer to a different question. It is the discount rate that makes the net present value of all cash flows, including the resale price, equal to zero. The cap rate looks at one year of income as if it will repeat forever. The IRR looks at every dollar you put in and every dollar you get back over the life of the deal. That includes the purchase price, the annual cash flow after debt service, and the exit proceeds. It is the total return, expressed as an annual percentage. A serious buyer uses it to decide whether a deal beats the stock market or a bond. The cap rate vs IRR comparison is not a contest between two versions of the same thing. It is a contest between a photograph and a film.

The formal distinction comes from Geltner et al., Commercial Real Estate Analysis and Investments, which defines the cap rate as the current yield, NOI divided by price. It contrasts it with total return, which adds income and appreciation. The cap rate is a yield, not a return, because it ignores the resale price entirely. A 5% cap rate can produce a 0% or a 10% total return depending on what happens to rent growth and the exit cap rate. That single sentence is the reason the cap rate vs total return distinction matters. It is also the reason a low cap rate on a stable asset can be smarter than a high cap rate on a risky one.

Run the Numbers on a Concrete Case

Assume you buy a small multifamily building for $1,000,000. The NOI in year one is $80,000, which puts the going-in cap rate at 8%. You put down $250,000 and finance the rest at 6% interest-only for five years.The cash-on-cash return in year one is ($80,000 - $45,000) / $250,000, which is 14%. That looks like a great deal. But it is a levered return. It says nothing about what happens when you sell.

Now assume NOI grows at 3% per year.At the end of year five, you sell at a terminal cap rate of 7%. The resale price is the year six NOI divided by the exit cap rate. Year six NOI is $90,041 times 1.03, which is $92,742. Divide that by 0.07 and the sale price is $1,324,886. You pay a 2% selling commission. The net proceeds before paying off the loan are $1,298,388. Pay off the $1,000,000 mortgage and you receive $298,388 in equity from the sale.

Compare the Cap Rate and the IRR

Your cash flows are the $14,000 difference between NOI and debt service each year, which is the cash-on-cash return, and the $298,388 at sale.0%. The IRR, which solves for the discount rate that makes the present value of those five annual payments plus the final sale proceeds equal to the $250,000 invested, comes to roughly 21%. The unlevered IRR, which ignores the debt entirely and looks at the total property value, is different again. The table below shows the cash flows.

Year	NOI	Debt Service	Cash Flow	Resale Proceeds
0	-	-	-$250,000	-
1	$80,000	$45,000	$14,000	-
2	$82,400	$45,000	$14,000	-
3	$84,872	$45,000	$14,000	-
4	$87,418	$45,000	$14,000	-
5	$90,041	$45,000	$14,000	$298,388

The cap rate on this deal is 8% going in and 7% at exit. The IRR is 21%. The cap rate vs IRR comparison shows why the cap rate is a starting point, not a verdict. The buyer who quotes only the 8% cap rate is missing the 21% return that comes from the exit sale. The buyer who quotes only the 21% IRR is missing the risk that the exit cap rate moves from 7% to 8%, which would cut the resale price to $1,159,275 and the IRR to roughly 15.0%.

A low cap rate is not automatically a bad deal. The cap rate measures the yield on the purchase price. The IRR measures the return on the entire investment, including the resale. Buy at a 4% cap rate and sell at a 3% cap rate. The appreciation from the cap rate compression alone can produce a double-digit IRR. Conversely, buying at an 8% cap rate and selling at a 10% cap rate can produce a negative IRR even if the income stream is stable. The cap rate vs total return distinction is the entire game.

The mechanism is the terminal cap rate. The exit cap rate is an assumption. A 100 basis point change in that assumption can swing value by 10% to 15%. A property bought at a 5% cap rate with NOI growing at 5% per year and sold at a 4% exit cap rate produces a far higher IRR than the same property bought at a 7% cap rate with NOI flat and sold at an 8% exit cap rate. The first deal looks expensive on the surface. The second looks cheap. The IRR tells you which is actually better.

This is why the cap rate vs cash on cash return distinction matters. The cap rate is unlevered, meaning it ignores debt. Cash-on-cash is levered and includes the debt service. Borrowing at a rate below the cap rate increases the cash-on-cash return above the cap rate. Borrowing at a rate above the cap rate decreases it. A building with a 5% cap rate financed at 4% produces a positive spread. The same building financed at 6% produces a negative spread. The cap rate alone cannot tell you which, because it has no debt in it. The IRR, which includes the actual financing costs, can.

The failure case for the low cap rate buyer is the assumption that appreciation will bail out a thin yield. Buy at a 4% cap rate and interest rates rise. The exit cap rate will likely rise too. The resale price will fall. The NOI growth that would have offset that rise is not guaranteed. A low cap rate on a stable asset with long-term leases and credit tenants can be a sound investment. A low cap rate on a building with short leases and volatile income is a gamble. The cap rate spread over the 10-year Treasury, which has historically run between 100 and 800 basis points depending on property type and cycle, is the first place to look. A spread at the tight end of that range is a warning, not an opportunity.

Lenders Use the Cap Rate to Measure Risk

Lenders quote the cap rate because it is the cleanest measure of the asset's ability to cover debt service. A lender underwriting a loan will look at the debt service coverage ratio, which is NOI divided by the annual debt service, and the loan-to-value ratio, which uses the appraised value. The cap rate is the bridge between NOI and value, so it appears in every term sheet. The lender is not using the cap rate to measure your return. The lender is using it to measure the risk of the income stream. A lower cap rate means a higher price per dollar of NOI. That means a smaller loan relative to the asset's income. That means a safer position for the lender. The lender quotes the cap rate because it is the market's pricing of risk, not because it is your return.

Appraisers Derive the Rate From Comparable Sales

Appraisers quote the cap rate because they are required to. The Appraisal Institute's The Appraisal of Real Estate defines the overall capitalization rate as the ratio of net operating income to the sale price. The direct capitalization method values a property by dividing NOI by the market-derived cap rate. An appraiser will derive the rate from comparable sales. They adjust for differences in property condition, lease terms, and location. They then apply it to the subject property's stabilized NOI. The appraiser is not predicting the future. The appraiser is reading the market's current pricing. The going-in cap rate, the rate at purchase, is a fact. The exit cap rate, the rate at sale, is an assumption. The appraiser will use the market's expectation for that assumption, not a guess.

Investors Weight the Two Differently

Investors quote both, but they weight them differently. A broker will lead with the cap rate. It is comparable across deals. It is the number a seller's agent knows the buyer will see first. An institutional investor will run a full discounted cash flow model and focus on the IRR. The IRR captures the timing of the cash flows and the resale. A private equity fund with a five-year hold will underwrite a going-in cap rate and a terminal cap rate. The difference between the two is often the source of the return. A value-add investor will quote the cap rate on the stabilized NOI, not the trailing NOI. The business plan is to increase the income and sell at a lower cap rate. The seller who quotes a pro-forma NOI that assumes full occupancy and market rents is quoting a different asset from the one the buyer is underwriting. The 10% to 20% gap between trailing and pro-forma NOI is where deals fall apart.

The cap rate vs IRR question is not about which is better. It is about which is appropriate for the decision at hand. The cap rate is a snapshot of the current yield. It is the right tool for comparing two properties with similar risk and growth profiles. The IRR is the total return. It is the right tool for deciding whether a specific deal, with its specific financing and exit plan, meets a required return. The two will rarely agree. The cap rate says nothing about appreciation. The IRR says nothing about the market's current pricing. Use the cap rate to screen. Use the IRR to decide. Use the difference between the going-in and exit cap rates to understand where the return is coming from.

Buyers miss the cap rate vs total return distinction because the cap rate is so easy to quote and so hard to interpret. A 7% cap rate sounds like a 7% return. It is not. It is a 7% yield on the purchase price. The actual return depends on whether the NOI grows, whether the exit cap rate stays flat, and whether the building needs a new roof. The total return has two components: the income return and the appreciation return. The cap rate only captures the first. Geltner et al. make this explicit: the cap rate is the current yield, and the total return adds the change in value. A building with a 7% cap rate and 2% NOI growth, sold at the same cap rate, produces a total return of roughly 9% before financing. A building with a 7% cap rate and flat NOI, sold at an 8% exit cap rate, produces a total return below 7%, possibly negative.

The failure case is the buyer who underwrites the deal on the cap rate and ignores the exit. That buyer will pay a price based on the going-in cap rate. At sale, the terminal cap rate may have moved 50 basis points. The equity return has been cut in half. Build a sensitivity table in Excel using the Data Table function. Show how the IRR changes with different exit cap rates and NOI growth rates. A grid that runs the exit cap rate from 6% to 8% and the NOI growth from 1% to 5% will show the range of outcomes. If the IRR is acceptable across the whole grid, the deal is robust. If it only works at the optimistic corner, the deal is a gamble.

The buyers who get this right quote the cap rate as a market indicator and the IRR as a decision metric. They know that the cap rate is the market's current pricing of risk. The spread over the 10-year Treasury is the actual measure of that risk. They also know that the cap rate is a pre-leverage yield. The cash-on-cash return, which is the annual pre-tax cash flow divided by the cash invested, is the levered version. The cap rate vs cash on cash return comparison is the difference between the asset's performance and the equity's performance. The cap rate is the same regardless of how you finance the deal. The cash-on-cash return changes with the loan terms. The IRR includes both the debt service and the resale. It is the only one that tells you whether the equity is being paid for the risk.

The going-in cap rate is a fact. The exit cap rate is a forecast. It is the single most important assumption in the deal. A 100 basis point increase in the exit cap rate, from 6% to 7%, reduces the resale value by roughly 14%, assuming NOI is unchanged. That swing is larger than most operating income over a five-year hold. The cap rate vs IRR relationship is dominated by the exit assumption, not the purchase yield. The resale proceeds are typically 60% to 80% of the total return in a leveraged deal.

The exit cap rate is not the going-in cap rate plus a fixed spread. It is a function of the prevailing interest rates, the risk of the specific asset, and the market's expectation for future NOI growth. A building with long-term leases to credit tenants will trade at a lower exit cap rate than a building with short leases in a secondary market. The risk is lower. The cap rate spread over the 10-year Treasury, which CBRE publishes in its semi-annual survey, has historically been 300 to 400 basis points for core properties. That spread widens and narrows with the cycle. The 2024 spread, as published by CBRE, was roughly 350 basis points for multifamily. That figure is revised every six months. Check it against the latest survey.

The failure case is the seller who quotes a going-in cap rate based on a pro-forma NOI that assumes full occupancy and market rents. The buyer discovers that the trailing NOI is 15% lower. The cap rate on the trailing NOI is approximately 17.6% higher. The deal falls apart. Underwrite the trailing NOI. Add back only the capital expenditures that are clearly deferred. Use that number for the going-in cap rate. The exit cap rate should be the current market rate for similar assets, not the going-in rate minus a discount. A buyer who assumes the exit cap rate will compress is making a bet on the market, not an investment in the property.

Cap rates move with interest rates, but not one-to-one. When the 10-year Treasury yield rises, cap rates tend to rise, but by less. Real estate investors accept a narrower spread when the alternative is a bond. When the Treasury yield falls, cap rates tend to fall, but again by less. Investors demand a floor for the risk of owning a building. The cap rate spread, the difference between the cap rate and the 10-year Treasury, is the market's compensation for the risk of illiquidity, leasing, and operational leverage. A spread of 100 basis points means the market is paying almost nothing for the risk. A spread of 800 basis points means the market is pricing in distress.

The relationship is not a law. It breaks down during periods of credit stress. In 2020, the 10-year Treasury fell to 0.5% while cap rates for core multifamily fell to 4%, a spread of 350 basis points. In 2023, the 10-year rose to 4.5% and cap rates rose to 5.5%, a spread of 100 basis points. The spread tightened because investors believed that NOI growth would outpace inflation and that the Fed would cut rates. The cap rate vs IRR analysis must account for this. A cap rate that looks low in a low-rate environment can be high in a high-rate one. The buyer who underwrites a 5% cap rate with a 4% Treasury yield and a 100 basis point spread is assuming the spread will hold. If the Treasury rises to 5% and the spread stays at 100 basis points, the cap rate goes to 6% and the property loses 17% of its value. The IRR will be negative even if the NOI grows.

The 10-year Treasury yield is published daily by the Federal Reserve Bank of St. Louis on FRED. The 2024 average was 4.2%. The cap rate spread, as measured by CBRE's survey, was 350 basis points for multifamily in the second half of 2024. That figure is revised every six months. Use the current Treasury yield, not a historical average. Stress-test the deal with a 100 basis point widening in the spread. If the deal fails that test, it is not a good deal at the current price.

The cap rate vs IRR framework suits the investor who is buying a stabilized income property with a defined hold period and a clear exit plan. It suits the small landlord who wants to know whether a 5% cap rate on a stable building is better than a 7% cap rate on a risky one. The answer is the IRR, not the cap rate. It suits the commercial analyst who needs to compare a 10-year hold with a 5-year hold. The IRR accounts for the time value of money and the cap rate does not. It suits the student of real estate finance who wants the formal definition, the band-of-investment derivation, and the distinction between the cap rate and the discount rate.

It does not suit the day trader looking for a quick yield on a REIT. The cap rate on a public REIT is not the same as the cap rate on a private building. The IRR on a stock is driven by earnings growth, not NOI. It does not suit the homeowner trying to value a primary residence. There is no NOI and no resale assumption that matters. It does not suit the buyer who wants a single correct cap rate for a property without doing a market survey. The cap rate is a market-derived number that changes with every comp and every lease. The cap rate vs total return distinction is a tool for people who are buying income, not for people who are buying a place to live or a stock ticker.