What Is Vacancy Rate?
Vacancy rate is the share of time a rental property - or the share of units in a market - sits empty and earns no rent. Investors subtract an expected vacancy allowance from gross rent to estimate realistic income, because even well-run rentals lose some rent between tenants.
Vacancy Rate in plain English
Vacancy rate measures how much of the time a unit is empty. For one rental, it is the share of the year with no tenant paying rent; for a market, it is the share of units that are empty.
Investors subtract an expected vacancy allowance from potential rent to estimate realistic income, because even well-run rentals lose some rent between tenants.
Formula
Vacancy Rate = Vacant Days ÷ Total Days × 100- Vacant Days
- Days in the period the unit earned no rent.
- Total Days
- Days in the period, such as 365.
Many analyses combine vacancy with credit loss - rent owed but not collected.
Worked example
A reserve budget for a $2,000-a-month rental
Illustrative example - round numbers, not current market data. Calculated with Reaixo's calculator engines.
Assumptions
- Rent
- $2,000 a month
- Expected vacancy
- 3 weeks a year between tenants
- Routine maintenance and repairs
- 8% of rent (illustrative)
- Roof replacement
- $12,000 every 25 years
- Furnace and AC replacement
- $9,000 every 18 years
- Water heater replacement
- $1,800 every 12 years
- Flooring and paint replacement
- $6,000 every 8 years
| Step | Calculation | Result |
|---|---|---|
| 1. Vacancy allowance | $2,000 × 12 ÷ 52 × 3 weeks | $1,385 (5.8%) |
| 2. Maintenance allowance | $24,000 × 8% | $1,920 |
| 3. Capital reserve (cost ÷ life, summed) | $12,000 ÷ 25 + $9,000 ÷ 18 + $1,800 ÷ 12 + $6,000 ÷ 8 | $1,880 |
| 4. Total yearly set-aside | $1,385 + $1,920 + $1,880 | $5,185 |
Set aside each month: $432. About $432 of every $2,000 rent payment (22%) should be treated as already spent. Budgeting from the property's own components and local turnover is more reliable than a single rule of thumb.
What this calculation leaves out
- Component costs and lifespans are illustrative; use quotes and the age of the actual systems.
- Reserves are for expected wear; keep a separate emergency fund for surprises such as a sewer line.
Try it: Vacancy Rate with your own numbers
Interactive and illustrative: change any value and the results update instantly in your browser. The figures come from the same engines as REAIXO's full calculators.
From rent to cash flow: the NOI waterfall
Gross rent shrinks at every step: vacancy, operating expenses, the mortgage and reserves. NOI is the property's income before financing; cash flow is what you keep.
- Net operating income
- $23,454
- Per year, before the mortgage
- Estimated cash flow
- $3,064
- $255 a month
- Cap rate on the price
- 7.33%
Show the numbers as a table
| Step | Per year | Per month |
|---|---|---|
| Gross scheduled income | $36,000 | $3,000 |
| Vacancy and credit loss | −$1,800 | −$150 |
| Effective gross income | $34,200 | $2,850 |
| Operating expenses | −$10,746 | −$896 |
| Net operating income | $23,454 | $1,955 |
| Debt service (principal and interest) | −$18,680 | −$1,557 |
| Capital-expenditure reserve | −$1,710 | −$143 |
| Estimated cash flow | $3,064 | $255 |
Formula
Effective gross income = Gross scheduled income − VacancyNOI = Effective gross income − Operating expensesCash flow = NOI − Debt service − Capital-expenditure reserveAssumptions
- 30-year fixed loan, no points; one unit with no other income, HOA or utilities.
- Vacancy is taken off gross rent; management, maintenance and the capital-expenditure reserve are a share of collected rent.
- The capital-expenditure reserve sits below NOI: it is cash set aside, not an operating expense.
- Income taxes, depreciation and appreciation are left out.
Why it matters
A few extra weeks of vacancy can erase a year of thin cash flow. Turnover also brings cleaning, repairs and leasing costs on top of lost rent.
Common mistakes
- Assuming zero vacancy because the unit is rented today.
- Using a market-wide rate for a property with higher turnover.
- Forgetting make-ready costs between tenants.
Compare and common questions
Vacancy Rate: frequently asked questions
What vacancy rate should I assume?
Use local evidence - how long similar units take to rent and how often tenants move. A few weeks a year is a common starting assumption, not a standard.
How do I lower my rental vacancy rate?
Price at market, keep the unit in good repair, respond quickly to maintenance requests and start marketing before the current tenant leaves.
Is vacancy the same as credit loss?
No. Vacancy is rent lost while the unit is empty; credit loss is rent owed by a tenant but not collected. Many budgets combine them.
Related Terms
Where it fits
- Investing, Leasing & Operations: before this, Gross Rental Income; next, Operating Expenses.
More Investing Terms
Recommended next step
Build a vacancy allowance from your own market.
How much to budget for vacancy and maintenance →Sources and review
No regulator defines this term; the page follows common industry practice.
Where this applies: Not regulated. Investment ratios and budgeting conventions are industry practice; lenders and analysts may define inputs differently.
Last reviewed: · Updated:
Examples use illustrative figures; rules of thumb are labelled as such. Rates, limits and program rules change - confirm current figures with your lender or a qualified professional.
This definition is provided for general educational purposes and is not financial, legal, tax, or real estate advice. Verify important decisions with appropriately qualified professionals.
Apply these investment calculations to a real property
Run the numbers with the free calculator, or get a property-specific analysis built on the same calculations.
- Free calculatorRental Cash Flow Calculator →Runs in your browser; nothing to sign up for.
- Paid reportRental Property Analysis →Model rent, cash flow, cap rate and returns. Price shown before checkout.
Or analyze a specific property: Essential Property Analysis, $19 · Property Decision Analysis, $49 · Professional Property Analysis, $99. You choose the depth before you pay.