Quick answer
For a single rental, vacancy rate can be calculated as vacant rentable days divided by total rentable days for the period. Economic vacancy compares rent not collected with potential rent. Budget lost rent together with utilities, marketing, cleaning, repairs and leasing costs.
Vacancy is more than an empty unit
A unit can be physically vacant, occupied but not producing expected rent, unavailable during renovation or leased below the modeled amount. Each condition affects cash flow differently. A useful landlord model labels the measure instead of using one unexplained percentage.
Three vacancy measures
| Measure | Basic calculation | Best use |
|---|---|---|
| Physical vacancy | Vacant rentable days ÷ total rentable days | Operations and leasing speed |
| Economic vacancy | Lost rent and concessions ÷ potential gross rent | Cash-flow performance |
| Turnover downtime | Days from possession to rent commencement | Vendor and make-ready planning |
Define whether days under major capital work are rentable. Consistency matters more than choosing a flattering denominator.
Example for one unit
If a property was rentable for 365 days and vacant for 24 of them, the physical vacancy rate is 24 ÷ 365, or about 6.6%. If concessions, delinquency or partial collections also occurred, the economic vacancy rate can be higher even though the unit was occupied.
Do not use the U.S. Census Bureau's national rental vacancy rate as the forecast for one unit. Census describes a broad market measure of vacant-for-rent inventory; property type, neighborhood, season, price and management create a different result.
Calculate the full vacancy cost
- Contract rent not collected during downtime.
- Owner-paid utilities, lawn, snow, security or HOA costs.
- Cleaning, repairs, painting and lock work.
- Advertising, photography, screening and leasing fees.
- Travel, inspections and vendor coordination.
- Concessions or a lower starting rent used to reduce downtime.
Some expenses would exist even with a tenant, while others are caused by turnover. Track them separately so the next forecast is based on real history.
Choose a planning assumption
- Calculate at least 12–36 months of property-specific vacant days when available.
- Separate planned renovation from normal leasing vacancy.
- Review comparable local listings and time-on-market cautiously.
- Model a base case and a stress case.
- Update after every turnover.
For a new acquisition without history, document the assumption and show how cash flow changes if vacancy lasts longer than expected.
Connect vacancy to cash flow
Use the rental cash-flow calculator to model an allowance and the turnover cost checklist for the one-time work. Keep the rental reserve large enough to cover both downtime and an urgent repair.
Ways to reduce avoidable downtime
- Schedule the move-out inspection and vendors before possession when lawful.
- Use a repeatable repair scope and approval process.
- Price the property from current, relevant local evidence.
- Prepare accurate photos and listing information promptly.
- Track application bottlenecks without weakening lawful screening standards.
- Document why each vacant day occurred.
Do not solve vacancy with unsafe shortcuts
Habitability, safety, fair housing, screening and deposit rules still apply when downtime is expensive. Do not advertise unfinished conditions inaccurately or skip required repairs. Local law and the lease control.
Track a small vacancy dashboard
For each turnover, record notice date, possession date, make-ready completion, listing date, approved application, lease signing and rent commencement. Calculate days spent in owner work, vendor work, marketing and applicant processing. The breakdown shows whether the problem is price, condition, scheduling or administration.
Separate market vacancy from operational vacancy
Market conditions influence demand, but preventable days can still occur after the former tenant leaves. A delayed scope, missing appliance or slow approval is operational. A well-prepared unit that takes longer to lease at a realistic price may reflect market vacancy. Use the distinction to choose the right remedy.
Model a multiunit property carefully
For multiple units, calculate rentable unit-days: number of rentable units multiplied by days in the period. Divide vacant unit-days by that total. Keep units removed for major renovation in a separate line so a capital project does not silently distort normal leasing performance.
Frequently asked questions
What is a “good” vacancy rate?
There is no universal target for one property. Compare the unit with its own history, local competition and a financially sustainable stress case.
Should delinquent rent count as vacancy?
It is not physical vacancy, but it affects economic vacancy or collection loss. Track both.
Should capital renovation days count?
Label them separately. Mixing strategic renovation with normal turnover can hide operational performance.