Vacancy rate is the percentage of rentable units that are unoccupied in a given period. Healthy US residential markets typically run 6.5–7.5%. A portion—usually 4–6%—is unavoidable frictional vacancy from tenant turnover. Misreading vacancy versus occupancy data is one of the most common underwriting mistakes Israeli investors make when entering US markets.
- US national residential vacancy rates range from 6.5–7.5% in healthy markets, according to Federal Reserve data.
- Frictional vacancy—normal turnover gaps between tenants—accounts for 4–6% of rental supply and cannot be eliminated.
- In a 100-unit building with 6% vacancy, investors lose approximately $1,800/month in revenue assuming $300/unit average rent.
- For every 1% vacancy increase above market norms, cap rate typically declines 0.3–0.5 percentage points when income was underwritten at full occupancy.
- A 92% occupancy rate is mathematically identical to an 8% vacancy rate—always verify which metric a source is reporting.
What Is Vacancy Rate — and Why It Belongs in Every Investor's Toolkit
Vacancy rate is the percentage of rentable units in a property or market that are sitting empty at a given point in time. If a 100-unit apartment building has 7 units unoccupied, the vacancy rate is 7%. Simple math — but what that number tells you about a deal, a market, or a timing decision is anything but simple.
For investors underwriting rental properties, vacancy rate is a core input into net operating income (NOI) — the income a property generates after operating expenses but before debt service. If your NOI projection assumes every unit is rented every day of the year, you're not underwriting a real deal; you're underwriting a best-case fiction. Vacancy rate is how you correct for that.
The metric also flows directly into cap rate (capitalization rate — the ratio of NOI to property value) and cash flow (what's left after all expenses and debt payments). Get vacancy wrong, and your entire return model breaks.
What Is a Good Vacancy Rate for Rental Properties?
A healthy US rental market typically runs a vacancy rate of 6.5–7.5% according to Federal Reserve data, and that range isn't a sign of trouble — it's the cost of having a functioning rental market.
This baseline exists because of what analysts call frictional vacancy: the unavoidable gap between one tenant moving out and the next one signing a lease. Even in tight markets, units need to be cleaned, repaired, listed, screened, and leased. The Census Bureau puts this normal frictional floor at 4–6% of rental supply. Below that range, you're looking at an exceptionally supply-constrained market. Above 8–10%, you're looking at either weak demand or a supply glut — and your underwriting should reflect the risk.
The practical takeaway: if a property has been running at 5–6% vacancy for several years, that's normal business. If it's sitting at 12%, dig into why — it's either a property-specific issue (deferred maintenance, poor management, weak location) or a market-wide signal worth investigating before you commit capital.
How Does Vacancy Rate Affect Property Value and Cap Rate?
Every empty unit is a direct revenue leak, and in investment real estate, lost revenue flows straight through to valuation.
Here's the mechanics: in a 100-unit apartment building where units rent for $300/month on average, a 6% vacancy rate means 6 units are empty — costing $1,800 per month in lost rent revenue. Over a full year, that's $21,600 in income that never arrives, which reduces NOI, which lowers the value a buyer will assign to the property when applying a cap rate.
The compounding effect is sharper than most new investors expect. For every 1% increase in vacancy above a market's norm, cap rate typically declines 0.3–0.5 percentage points if the original underwriting assumed 100% occupancy. On a $2 million apartment complex underwritten at a 6% cap rate ($120,000 NOI), each 1% of unexpected vacancy erodes roughly $6,000–$10,000 in annual income — and, at the same cap rate, that translates to $100,000–$167,000 in lost property value.
This is why experienced investors stress-test their models: what does the deal look like at 8% vacancy? At 12%? A property that pencils only at 100% occupancy isn't a deal — it's a bet.
What Is the Difference Between Vacancy Rate and Occupancy Rate?
Vacancy rate and occupancy rate are mathematical inverses. A 92% occupancy rate is identical to an 8% vacancy rate. They describe the same building from opposite directions.
This sounds obvious until you're comparing market reports from different sources. One CoStar report might say "multifamily occupancy in Tampa hit 94%." A Census Bureau release might report "vacancy at 6.5%." If you don't catch which metric each source is using, you'll misread the market signal — sometimes dramatically.
The rule: always verify which metric a source is reporting before drawing conclusions. When in doubt, convert: subtract vacancy rate from 100 to get occupancy, or subtract occupancy from 100 to get vacancy. Treat them as interchangeable only after you've confirmed which one you're looking at.
In deal underwriting, most operators work in occupancy terms because leases and rent rolls are framed that way ("93 of 100 units leased"). In market analysis, vacancy rate is the standard. Know which language your data source is speaking.
How Do I Calculate Vacancy Rate for My Rental Property?
The formula is straightforward:
Vacancy Rate = (Vacant Units ÷ Total Units) × 100
For a single-family rental or small portfolio, the calculation works in time rather than units: if a unit sat empty for 3 weeks out of a 52-week year, its vacancy rate for that year was about 5.8%.
A few things to watch when running your own numbers:
- Use a trailing 12-month average rather than a single month's snapshot. Monthly vacancy can spike during turnover and compress during lease-up — the annual average gives you the stable signal.
- Separate physical vacancy (units literally empty) from economic vacancy (units occupied but not paying — delinquency, concessions, free months). Economic vacancy is almost always higher, and it's the number that matters for your cash flow projections.
- When evaluating a seller's rent roll, ask for both occupancy history and delinquency reports. A building that shows 97% occupancy but 8% in delinquency or concessions is effectively running at a much weaker economic position than the headline suggests.
For a market-level rental market analysis, pull vacancy data from the Census Bureau's American Community Survey (ACS), Zillow's market reports, or CoStar for commercial multifamily assets. Local real estate boards and county planning departments sometimes publish supply/demand data that isn't in national databases.
What Causes High Vacancy Rates in a Real Estate Market?
High vacancy is almost always the result of a supply-demand imbalance — either demand fell, supply grew too fast, or both happened at once.
The most common causes:
- Oversupply: Developers overbuild in response to a demand signal, and the new inventory floods the market before absorption catches up. Austin and Dallas saw this dynamic play out in 2023–2024, when rapid construction completions pushed vacancy up sharply before absorption started compressing it again in 2025.
- Demand shocks: Job losses, corporate relocations, or population outflows reduce the pool of renters. This is the structural risk in single-employer markets.
- Seasonal patterns: Coastal and college markets often see vacancy spike between academic or vacation seasons — a natural rhythm, not a structural problem.
- Property-level issues: Poor management, deferred maintenance, or pricing out of range with the local market can create high vacancy in a building even when the surrounding market is healthy.
- Affordability ceiling: When rents rise faster than local wages, renters double up or move away, pushing vacancy up even in otherwise strong metros.
Understanding why vacancy is elevated matters as much as the number itself. An investor who buys a poorly managed building in a healthy market is underwriting a management fix — a solvable problem. An investor who buys into a market with structural demand erosion is underwriting a much harder turn.
How Do I Find the Vacancy Rate for a Specific Market or Property?
Market-level data and property-specific data require different sources, and conflating them is a common underwriting mistake.
For market-level vacancy:
- Census Bureau ACS — the most comprehensive and granular US housing data, updated annually, with metro and county breakdowns
- Zillow Research — strong for residential and multifamily; regularly publishes metro-level vacancy and rent growth trends
- CoStar / CBRE — institutional-grade multifamily data; typically subscription-based but referenced in brokerage reports
- Federal Reserve regional reports (Beige Book) — qualitative but useful for reading demand trends by region
For property-specific occupancy:
- The property's rent roll (current leases and vacant units)
- Historical leasing records from the property management company
- County tax assessor records (can indicate number of units; occupancy must be inferred or obtained directly)
- Conversations with local property managers — often the fastest source of real-time market color
One non-obvious layer: Florida multifamily vacancy tends to run 0.5–1.5 percentage points below the national average, driven by consistent retiree migration demand. A Florida market reporting 5.5% vacancy isn't outperforming — it's performing normally for that context. Anchoring to the national 6.5–7.5% range and treating 5.5% as a "tight market" could lead you to overpay for a property that's simply operating at its regional norm.
The principle is the same everywhere: vacancy rate is only meaningful in context. Know your market's baseline, track the trend, and build your underwriting around realistic occupancy expectations rather than optimistic projections. That discipline is what separates investors who consistently hit their return targets from those who are perpetually surprised by "unexpected" vacancies.
In short
Vacancy rate is the percentage of rental units sitting empty at a given time. In healthy US residential markets, Federal Reserve data shows a normal range of 6.5–7.5%, with 4–6% attributable to unavoidable frictional vacancy from tenant turnover. Every 1% of excess vacancy above market norms typically reduces cap rate by 0.3–0.5 points when income was underwritten at full occupancy. Vacancy rate and occupancy rate are inverses—8% vacancy equals 92% occupancy—so verifying which metric a data source reports is essential for accurate market analysis.
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SubscribeFAQ
What is a good vacancy rate for rental properties?
In healthy US residential markets, a vacancy rate of 6.5–7.5% is considered normal, per Federal Reserve data. Within that, 4–6% is expected frictional vacancy from routine tenant turnover. Rates consistently below 5% signal strong demand; rates above 10% warrant closer scrutiny of local market fundamentals.
How does vacancy rate affect property value and cap rate?
Vacancy directly reduces net operating income, which drives cap rate and valuation. When income is underwritten at 100% occupancy, every 1% increase in vacancy above market norms typically reduces cap rate by 0.3–0.5 percentage points. This makes conservative vacancy assumptions critical during due diligence.
What is the difference between vacancy rate and occupancy rate?
They are two sides of the same metric: vacancy rate + occupancy rate = 100%. A 92% occupancy rate is identical to an 8% vacancy rate. Different data providers report one or the other, so always confirm which measure a source uses before comparing markets or properties.
How do I calculate vacancy rate for my rental property?
Divide the number of vacant units by total rentable units, then multiply by 100. For example, 6 empty units in a 100-unit building equals a 6% vacancy rate. You can also calculate it on a time basis: vacant unit-days divided by total available unit-days over a period.
What causes high vacancy rates in a real estate market?
Common drivers include economic slowdowns reducing renter demand, oversupply from new construction, seasonal patterns, misaligned rents above market rates, or poor property condition. Structural factors like population decline or major employer exits can create persistently elevated vacancy that is harder to reverse.
How do I find the vacancy rate for a specific US market or property?
Federal Reserve FRED database publishes rental vacancy data by region. The US Census Bureau Housing Vacancy Survey provides quarterly metro-level figures. CoStar and Yardi Matrix offer submarket-level multifamily data for a fee. For a specific property, request trailing 12-month rent rolls and calculate directly from actual unit occupancy history.