Vacancy rate is the percentage of time a rental property, or the share of units in a portfolio, that sits empty and earning no rent over a given period. It is a core measure of rental risk: the higher the vacancy rate, the more income a property loses to empty months, which directly reduces cash flow and returns.
How does vacancy rate work?
Vacancy rate turns the risk of empty units into a single number you can plan around. For a single property, it usually measures the fraction of the year the unit is unrented. For a building or portfolio, it measures the share of total units, or total potential rent, that is unoccupied. Either way, it tells you how much of your expected income you are likely to lose to gaps between tenants.
How it is calculated
- For one unit over a year: divide the number of vacant days by the total days available, then multiply by 100. Example: 30 vacant days out of 365 is roughly an 8% vacancy rate.
- For a portfolio: divide vacant units by total units (or lost rent by potential rent) and multiply by 100.
- Physical vacancy counts empty units; economic vacancy also captures rent lost to non-payment and concessions.
- The opposite figure, occupancy rate, is simply 100% minus the vacancy rate.
Vacancy matters because it flows straight through to your bottom line. Every vacant month reduces the property's net operating income, which in turn drags down its cap rate, its cash flow, and ultimately its cash-on-cash return. This is why experienced investors never underwrite a deal at 100% occupancy.
Physical vs economic vacancy
Two properties can show the same physical vacancy yet perform very differently, because being occupied is not the same as being paid. Understanding both views prevents nasty surprises.
Physical vacancy is the straightforward count: how many units, or how many days, sit empty. It is easy to measure and is what most people mean by vacancy rate. But it can flatter a property that is full of tenants who pay late, pay partial rent, or received heavy discounts to sign.
Economic vacancy captures the rent you actually failed to collect, including non-payment, concessions, and below-market leases. A building can be 100% physically occupied yet suffer meaningful economic vacancy if tenants are not paying full freight. When you assess real returns, economic vacancy is the more honest figure.
Using vacancy in your projections
Prudent investors build a vacancy allowance into every projection, often a few percentage points based on local data, so the numbers survive real-world gaps. That assumption feeds directly into the property's rental yield and its ability to cover debt, which lenders test through the DSCR. Setting it too low is one of the most common ways new investors overstate a deal.
Why vacancy rate matters and who should watch it
Vacancy rate matters to anyone buying, holding, or lending against rental property, because it is the difference between projected income and collected income. It is also a fast read on a market: a low, stable vacancy rate signals healthy demand, while a rising one warns of oversupply or weakening tenants.
Pros | Cons |
|---|---|
A low local vacancy rate signals strong, reliable tenant demand. | High or rising vacancy directly erodes income and returns. |
Building a vacancy allowance into projections keeps your numbers realistic. | Physical vacancy alone can hide payment and concession problems. |
Comparing vacancy across markets helps you pick stronger locations. | Vacancy is volatile for short-term rentals and seasonal markets. |
Tracking it over time flags problems before they hit cash flow hard. | Underestimating it in projections leads to overpaying for a deal. |
For diaspora investors evaluating markets from afar, vacancy rate is one of the most useful screening tools, since it captures demand you cannot judge by walking the neighborhood. It is especially critical for a short-term rental, where occupancy swings hard with season and events, and it is a key metric to verify independently when a seller or a turnkey property provider presents rosy income projections.
Frequently asked questions
It depends heavily on the market and property type, so treat any single number as an example. A low single-digit rate generally signals healthy demand, while a persistently high rate suggests oversupply, weak demand, or management problems. Always compare against the local average rather than a universal benchmark.
Directly and immediately. Every vacant period reduces the rent you collect, which lowers net operating income, cash flow, and cash-on-cash return. Because vacancy hits the top line, even a few extra empty weeks a year can turn a marginally profitable rental into a losing one.
They are two sides of the same coin. Occupancy rate is the percentage of time or units that are rented, and vacancy rate is the percentage that are empty. Together they always add up to 100%, so a 95% occupancy rate means a 5% vacancy rate.
Yes. Underwriting a property at full occupancy overstates its income, because turnovers, repairs between tenants, and slow lease-ups are inevitable. Build a vacancy allowance based on local data into your projections so the numbers hold up under real conditions.
Short-term rental occupancy swings sharply with season, events, and local demand, so vacancy is both higher and less predictable than for a long-term lease. Estimating it conservatively is essential, since a few extra empty nights each month can erase the income advantage over a standard rental.
Updated July 21, 2026
Disclaimer
Dara provides this glossary for general educational purposes only. It is not financial, legal, or tax advice, and availability, fees, and terms vary by country and corridor.
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