Vacancy rate

The share of rental units sitting empty at a given time, either for a specific property or a whole market. Included in underwriting as a percentage of gross rent that won't get collected.

Investment terms · Updated September 2026

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Part 1 of 4

Why a seller cares

Buyers of a rental subtract a vacancy allowance from the rent whether or not the building is full, because tenants leave. A seller quoting full occupancy as permanent income is quoting a number no underwriter will use.

Part 2 of 4

A simple example

Your fourplex has been full for two years. The buyer still underwrites 5% vacancy, about $2,400 a year, because that is the market's rate.

Vacancy rate: a simple example
The situationWhat the buyer uses
Full for two yearsThe market vacancy rate anyway
One unit empty for monthsTheir own estimate, and a question about why
A market with 10% vacancy10%, whatever your building shows

Vacancy is an assumption, not an observation. Buyers assume some even when they see none.

Part 3 of 4

What people get wrong

That full occupancy means 0% vacancy in the numbers. It means 0% today, and underwriting is about the next ten years.

Part 4 of 4 · where to read next

Where it appears in the sale

What a definition is, and what it isn't

Keighbor is a software company, not a law firm, brokerage, or tax adviser. This is general information, not legal, tax, financial, or real estate advice about your sale. Your situation may differ. Before acting on a contract, disclosure, title, tax, or pricing question, ask an appropriately licensed professional in your state.

Written and researched by Keighbor Research · drawn from the reference glossary · how we research and check what we publish

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