A cap rate is the most-cited number in real estate. Brokers quote it on every listing. Underwriting templates ask for it. Market reports describe entire submarkets in terms of where cap rates have moved. It is also the metric most commonly misread by retail investors — partly because the formula is simple, partly because the same number means different things depending on context, and partly because the institutional investors who set the benchmarks don’t talk about it the way podcasts do.
This guide is the standing reference for cap rate analysis on the AtlasTerminal blog. It pulls together the foundational definition, the contextual reading, and the related metrics into one place, with links into the deeper analytical posts at each step. If you are coming to cap rates for the first time, read top-to-bottom. If you are using this as a desk reference, jump to the section you need.
What a cap rate actually is
Capitalization rate — almost always shortened to “cap rate” — is a single ratio:
Cap Rate = Net Operating Income ÷ Property Value
NOI is the property’s annual income after operating expenses but before mortgage payments or taxes on the investor’s income. Property value is what someone would pay for it today — the purchase price on an acquisition, the appraised value on a refinance, or a market-derived value on a stabilized hold. Run them through that formula and you get a percentage: the property’s unleveraged yield.
The first surprise for most investors is that cap rate is a property metric, not an investor metric. It describes what the building earns as an income stream, independent of who owns it, how it was financed, or what the investor’s tax situation is. Two investors looking at the same property at the same price calculate the same cap rate. The cap rate doesn’t change based on the loan you take or the cash you put down — only the numerator (NOI) and the denominator (value) move it.
For a worked example and a walk-through of the formula step by step, the Cap Rate basics post covers the math and four common mistakes beginners make.
What cap rate deliberately leaves out
Cap rate is useful precisely because of what it strips out. It ignores:
- Financing. The mortgage doesn’t appear. Two buyers with the same cap rate but different leverage have very different returns. That’s what cash-on-cash return measures.
- Time value. Cap rate is a snapshot of one year’s yield. It says nothing about how income grows, how the property appreciates, or what happens at exit. That’s what IRR and equity multiple capture.
- Tax position. Depreciation, 1031 treatment, capital gains — none enter the cap rate. The same cap rate produces different after-tax returns for different investors.
- Capital expenditures. NOI excludes major capex (roof replacement, HVAC, unit turns). A property with deferred capex looks better on cap rate than its real economics warrant.
These omissions are features. The metric is built to compare properties on their core income economics, with all the investor-specific variables stripped out. The mistake is reading it as a complete picture of a deal’s return.
Reading a cap rate in context
A 6.0% cap rate is not “good” or “bad” in isolation. It is a number that means different things in different contexts.
Context 1 — Cycle position. Cap rates compress (move lower) when capital is plentiful, interest rates fall, or supply is constrained. They expand (move higher) when rates rise, capital flees, or new supply hits the market. A 6.0% cap in 2022 when the market was at peak compression meant something very different than a 6.0% cap in 2026 with rates elevated and capital cautious. Cap rate compression is the deeper post on this.
Context 2 — Asset class. A 6.0% cap for stabilized core multifamily in a primary market is institutional pricing. A 6.0% cap for a Class C fourplex in a tertiary market with deferred maintenance is rich. The asset’s risk profile sets what cap rate is appropriate, and “appropriate” varies by asset class far more than by absolute number.
Context 3 — Spread over Treasury. Institutional underwriters often think about cap rates as a spread over the 10-year Treasury yield rather than as absolute numbers. Historically, that spread has run 150–300 basis points; spreads outside that range warrant explanation. A 5% cap when the 10-year is at 2% is a wider spread than a 6% cap when the 10-year is at 4.5%.
Context 4 — In-place vs market rents. If a property’s NOI reflects rents 10% below market, the in-place cap rate understates the property’s earning power once rents are reset. This is where the entry cap rate diverges from the stabilized cap rate, which is what yield on cost makes explicit for value-add deals.
A cap rate without context is noise. A cap rate with cycle, asset class, spread, and rent context is signal.
Compression and expansion — what moves cap rates
Cap rates are set by capital markets, not by income. When sale prices rise faster than NOI grows, cap rates compress. When prices fall faster than NOI shrinks, cap rates expand. Three forces drive most cap rate movement:
- Interest rates. When the 10-year Treasury falls, the required spread over Treasury can also fall — pushing cap rates lower. The 2020–2022 compression cycle was largely a rate-driven event.
- Capital flows. When institutional capital rotates into a sector (single-family rentals 2020–2022, industrial 2021–2024), cap rates compress in that sector independent of fundamentals.
- Supply. When new supply meets demand growth, cap rates hold. When supply exceeds demand (Sun Belt multifamily 2024–2025), cap rates expand.
The diagnostic question for any cap rate movement is: which of the three forces is driving it, and is that force durable? A compression driven by a rate cycle reverses when rates rise. A compression driven by supply scarcity persists longer. The full mechanics are in Cap Rate Compression Is Not a Signal — It Is a Symptom.
Going-in vs exit cap rate
Every hold-period model has two cap rates: the one at acquisition (the going-in cap, observed at purchase) and the one at sale (the exit cap, assumed at exit). The going-in cap is grounded in real comps. The exit cap is a forecast — and it is the single largest swing factor in most pro formas.
Retail underwriting almost always sets the exit cap equal to the going-in cap, or nudges it 25 basis points higher as a token gesture. Institutional convention is to add 25–50 basis points for a 5-year hold and 50–75 for a 7–10 year hold, reflecting physical depreciation, capital markets uncertainty, and the asymmetric cost of optimism at exit.
A 50 basis point miss on the exit cap can wipe out half a decade of 3% NOI growth in a single moment. This is why Your Exit Cap Is Doing More Work Than Your Rent Growth is required reading before any 5+ year underwriting.
Cap rate vs related metrics
Cap rate is one of a family of return metrics. Each answers a different question. Mixing them up — or using the wrong one for the question being asked — produces systematic errors.
Cap rate vs rental yield. Rental yield (gross or net) is the percentage return based on rent alone or on rent minus expenses. Cap rate uses NOI specifically, which has a standardized expense treatment. Gross rental yield is the loosest comparison; cap rate is the strictest. Rental yield vs cap rate unpacks when each is the right tool.
Cap rate vs yield on cost. Cap rate uses market value in the denominator; yield on cost uses total project cost (purchase + renovation + soft costs + holding). For a stabilized acquisition with no value-add, the two converge. For any deal involving renovation or development, yield on cost is the more honest metric. Yield on Cost — The Metric That Tells You If Your Renovation Math Works covers the framework.
Cap rate vs cash-on-cash return. Cap rate is unleveraged property yield; cash-on-cash is the after-debt-service cash flow as a percentage of the cash equity invested. A property with a 6% cap rate and 75% leverage at 7% interest produces a sharply different cash-on-cash than the same property bought all-cash. Cash-on-Cash Return — The Yield on the Cash You Actually Put In walks through the math.
Cap rate vs DSCR. DSCR is a credit metric — the ratio of NOI to annual debt service. Cap rate prices the property; DSCR measures whether the property can service its loan. A high cap rate doesn’t guarantee a strong DSCR if leverage is aggressive. The full framework — the lender vs investor DSCR, stress testing for rate and vacancy shocks, and the relationship to debt yield — is in the DSCR & Debt Coverage pillar guide.
Cap rate vs debt yield. Debt yield is NOI divided by loan balance — it strips out rate and amortization, which DSCR includes. For refinance risk, debt yield is the more durable metric, especially in rising-rate environments. Debt Yield Is the Refinance Stress Test Retail Investors Skip is the full treatment, and the broader framing sits inside the DSCR & Debt Coverage pillar guide.
A workflow for using cap rates
For an acquisition decision, run cap rate analysis in this order:
- Compute the in-place cap rate from the actual trailing-twelve NOI and the asking price. This is the listing’s headline number.
- Compute your underwritten cap rate using your own NOI assumption (re-quoted insurance, current taxes, realistic vacancy, real management fee, reserve allowance). This is often 50–150 basis points wider than the listed cap.
- Benchmark against market. Pull comps for the same asset class and submarket. If your underwritten cap is meaningfully tighter than market, you may be overpaying. If wider, the seller may know something.
- Set an exit cap. Convention is going-in + 25–50 bps for a 5-year hold. Stress at +75–100 bps for a hard case.
- Compare to development spread if value-add is involved. Yield on cost should run 150–250 bps above stabilized market cap.
A deal that survives these five steps is a deal that respects what cap rate can and cannot tell you. A deal that only works at the listing cap rate, with no underwriting of your own and no exit stress, is a deal whose math depends on the seller and the market being kind.
Where to go next
The posts referenced throughout this guide each cover one slice of cap rate analysis in depth. For a structured path through them by reader level:
- Beginners: start with Cap Rate basics, then NOI and Cash-on-Cash Return.
- Intermediate: move to Yield on Cost, Exit Cap Sensitivity, and DSCR Stress Testing.
- Professional: read Cap Rate Compression, Rental Yield vs Cap Rate, and Debt Yield.
Related pillar guides: the DSCR & Debt Coverage guide covers the financing-and-coverage layer that pairs with property-level yield; the Rental Property Underwriting framework puts cap rate inside the full institutional underwriting workflow.
Frequently Asked Questions
What is a good cap rate?
There is no single answer. A “good” cap rate depends on asset class, market, cycle position, and the property’s risk profile. Core multifamily in primary markets in 2026 trades around 4.5–5.5%. Value-add in secondary markets prices 6–8%. Tertiary-market single-family rentals can clear 8–10%. The right reference point is comparable stabilized assets in the same submarket and the spread over the 10-year Treasury.
How is cap rate different from ROI?
Cap rate is the property’s unleveraged yield for one year. ROI is a broader return measure that can include appreciation, leverage, and any time horizon. Cap rate is a snapshot; ROI is a calculation over a period. The two are not interchangeable.
Does cap rate include the mortgage?
No. Cap rate uses NOI, which is calculated before mortgage payments. Two buyers using different financing on the same property compute the same cap rate. To see how the mortgage affects returns, look at cash-on-cash return or DSCR.
Why do cap rates differ so much between markets?
Cap rates reflect perceived risk and growth expectations. Markets with high rent growth potential, strong demand fundamentals, and deep capital markets trade at lower (tighter) cap rates. Markets with weaker fundamentals or more risk price wider. Within a single asset class, cap rate dispersion across markets often spans 200–400 basis points.
Should I use the in-place cap rate or the stabilized cap rate?
For an acquisition decision, both — and they should diverge meaningfully on a value-add deal. The in-place cap reflects current income. The stabilized cap projects post-improvement income at the same purchase price. For value-add specifically, yield on cost is more honest than either because it also captures the cost of the improvements.
How does cap rate relate to property value?
The cap rate is the inverse of the price-to-NOI multiple. A 6% cap is the same as paying 16.7× annual NOI. When you hear “cap rates compressed by 50 basis points,” what happened is buyers are now paying a higher multiple of NOI for the same property — sale prices went up without NOI going up.
AtlasTerminal computes in-place cap rate, stabilized cap rate, yield on cost, and exit cap sensitivities side-by-side for any acquisition. Underwrite your next deal with the same metrics institutional buyers use.