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Vacancy is the lever behind your rent assumptions. If you know how to read vacancy data, you can underwrite rent growth and concessions with a lot more discipline.
By RentalAnalytics Editorial Team · Published July 8, 2026
The rental vacancy rate is the percent of rental housing units that are vacant and available for rent at a specific point in time. It is different from "occupied but for-sale" units or units that are vacant but not for rent. As a landlord or investor, it is one of the cleanest top-down indicators of how much leverage tenants have.
When vacancy rises, landlords typically respond by offering concessions, reducing asking rent growth, and accepting less qualified demand. When vacancy falls, the opposite happens: fewer concessions, faster leasing, and stronger rent growth.
Vacancy is a direct haircut to revenue. If scheduled gross rent is \(R\) and vacancy is \(v\), then effective gross income starts at \(R \times (1 - v)\) before you even account for concessions and bad debt.
Vacancy also signals how fragile your rent assumptions are. A deal underwritten to aggressive rent growth in a loosening vacancy environment is usually just a deal underwritten to a future price cut.
Physical vacancy is about units. It asks: how many units are empty and available? Economic vacancy is about dollars. It asks: how much revenue did you fail to collect because of vacancy, concessions, and nonpayment?
Physical vacancy is the better market-timing indicator. Economic vacancy is the better property performance indicator. In underwriting, you need both: physical vacancy for market stress testing and economic vacancy for your pro forma.
The best free national series is the Census Bureau Housing Vacancies and Homeownership Survey (HVS), distributed through FRED as "Rental Vacancy Rate in the United States."[1] It is quarterly and easy to pull for charts and backtests.
For local underwriting, use vacancy as a triangulation exercise. Combine the national HVS series with your metro's historical vacancy range (often available in local market reports) and what you see on the ground in leasing velocity, days-on-market, and concessions.
Vacancy is not a magic formula for rent growth, but it is a strong constraint. In a tight market, rent growth can stay positive even if expenses rise. In a loose market, rent growth usually has to slow because tenants have alternatives.
One disciplined approach is to anchor your rent growth assumption to a broad inflation signal, then scale it by your vacancy view. For example, the BLS reported CPI shelter up 3.4% over the 12 months ending May 2026.[2] If your submarket is looser than normal, you might underwrite below that national shelter growth, not above it.
Stress testing vacancy is less about finding the perfect number and more about protecting against downside. The easiest workflow is to model your base case and two downside cases, then see what breaks first: DSCR, reserves, or cash-on-cash.
If you want a quick way to run this, the RentalAnalytics cash flow analyzer lets you toggle vacancy and rent growth assumptions and see the impact on cash flow and DSCR in one screen.
The most common mistake is using a market average as if it were a property-specific forecast. A good property can beat its market and a bad one can underperform it. Vacancy data tells you the direction and the base pressure, not your exact leasing outcome.
The second mistake is treating vacancy as the only income risk. In soft markets, economic vacancy can widen because of concessions and bad debt even if physical vacancy does not look catastrophic.
The rental vacancy rate is the percent of rental housing units that are vacant and available for rent at a point in time. It is a market tightness indicator: higher vacancy generally means tenants have more leverage, while lower vacancy tends to support faster leasing and stronger rent growth.
There is no single universal target, but many landlords underwrite a stabilized vacancy assumption around 5% to 8% depending on market and property type. The most defensible benchmark is your local market's historical range, then a downside stress test above it.
For national rental vacancy, use the Census Bureau Housing Vacancies and Homeownership (HVS) series that is distributed through FRED. For metro-level context, pair that with ACS vacancy measures and local market reports. Government series are free, but they often lag the current market.
Vacancy is often a coincident-to-leading indicator for rent growth because landlords adjust asking rents and concessions when units sit longer. The caveat is data timing: official vacancy series are survey-based and released quarterly or annually, so you should also track leasing velocity and advertised rent changes.
Start with your base vacancy assumption and run scenarios at +2 and +5 percentage points. Translate vacancy into effective income by applying \((1 - v)\) to scheduled rent, then layer concessions and turn costs. A tool like the RentalAnalytics cash flow analyzer helps you see DSCR and returns under each scenario quickly.
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