Why It Matters
You budget for vacancy before you buy. Every unit will sit empty at some point — between tenants, during renovations, or in slow-season markets. The standard underwriting assumption is 5-8% of gross rental income allocated to vacancy, which accounts for roughly 2-4 weeks of lost rent per year per unit. On a property collecting $2,200/month, a 5% vacancy factor means you're planning for $1,320/year in lost income — money that never arrives.
Vacancy isn't just lost rent. Every turnover triggers a cascade of costs: cleaning, repairs, painting, marketing, showing the unit, screening applicants, and the opportunity cost of your time. A single turnover on a $1,800/month unit can cost $2,500-$4,000 when you add the vacant weeks to the make-ready expenses. That's why experienced investors obsess over tenant retention as much as tenant acquisition.
The national rental vacancy rate runs around 6-7%, but your specific market, property type, and management quality matter far more than the national average. A well-managed duplex in a supply-constrained market might run 2% vacancy. A Class C apartment complex in an oversupplied metro might run 12%. Know your local numbers.
At a Glance
- What it is: Any period a rental unit is unoccupied and not generating income
- Underwriting standard: Budget 5-8% of gross rent for vacancy in deal analysis
- Cost per turnover: $1,500-$4,000+ including make-ready, marketing, and lost rent
- National average: Roughly 6-7% rental vacancy rate across the U.S.
- Why it matters: Even one extra vacant month per year can cut annual cash flow by 15-25% on a typical rental
How It Works
The vacancy cycle. Every vacancy follows the same sequence: tenant gives notice (or doesn't), you inspect the unit, perform make-ready work (cleaning, paint, minor repairs), list the unit, show it to prospects, run tenant screening, sign a new lease, and collect the first month's rent. Each step takes time. A tight operation completes this in 14-21 days. A sloppy one takes 45-60. The difference between those two timelines on a $1,800/month unit is $1,200-$2,400 in vacancy loss.
Physical vs. economic vacancy. Physical vacancy means the unit is literally empty. Economic vacancy is broader — it includes units occupied by non-paying tenants, units under renovation, and concessions like free rent months. Your rent roll might show 100% occupancy, but if two tenants haven't paid in three months, your economic vacancy is far worse than it looks. Smart investors track both, because economic vacancy tells the truth your occupancy number hides.
Seasonal patterns. Vacancy clusters around lease expirations, and most leases expire in the months tenants prefer to move — May through September. Winter turnovers in cold-climate markets take longer to fill because fewer people apartment-hunt in January. Structure your lease terms so expirations land in peak rental season. A 14-month lease signed in March expires in May the following year, right when demand spikes.
The compounding effect. Vacancy doesn't just cost you one month's rent. On a leveraged property, you still owe the mortgage, insurance, taxes, and HOA during the vacant period. A $1,600/month rental with $1,200/month in fixed costs means every vacant month costs you $1,200 out of pocket — you're paying to own an empty box. Two vacant months per year on that property eat 60% of the annual cash flow you'd earn at full occupancy.
Real-World Example
Maria Gonzalez owns a fourplex collecting $1,750/month per unit — $7,000/month gross, $84,000/year. Her fixed costs (mortgage, taxes, insurance, management) run $5,100/month. At full occupancy, she nets $1,900/month in cash flow.
In March, a tenant in Unit 3 breaks their lease with 30 days' notice. Maria's property manager inspects the unit and finds moderate wear: scuffed walls, stained carpet in the bedroom, a dripping kitchen faucet. Make-ready costs hit $1,850 (paint: $650, carpet patch: $400, faucet: $85, cleaning: $350, marketing photos: $175, listing fees: $190).
The unit sits vacant for 26 days before a new tenant signs. That's $1,517 in lost rent ($1,750 x 26/30) plus $1,850 in turnover costs. Total cost of this single vacancy event: $3,367.
But the story doesn't end there. In August, the tenant in Unit 1 moves to another city with no warning — just stops paying and disappears. It takes Maria 18 days to regain possession through the legal process, then another 22 days of make-ready and re-leasing. That's 40 days of lost rent: $2,333. Make-ready on this unit runs $2,400 because the tenant left damage beyond normal wear.
Maria's annual vacancy tally: two events, 66 total vacant-unit days, $5,700 in combined turnover and lost-rent costs. Her effective vacancy rate for the year: 5.2% — right in line with the 5-8% she budgeted. The budget held because she planned for it. The investors who get hurt are the ones who underwrote at 0% vacancy and then panic when reality arrives.
Pros & Cons
- Budgeting for vacancy forces conservative underwriting — Allocating 5-8% to vacancy in your deal analysis builds a margin of safety that protects you when units turn over
- Vacancy tracking reveals management quality — High vacancy signals problems you can fix: slow make-ready, weak marketing, poor tenant retention, or above-market rents
- Seasonal vacancy can be managed with lease timing — Structuring lease expirations to land in peak rental season gives you the largest applicant pool and fastest re-leasing
- Short vacancies between tenants allow upgrades — A planned 2-week vacancy for improvements can justify a rent increase that more than covers the lost income over the next lease term
- Lost rent is permanent — Unlike a late payment, a vacant month's rent can never be recovered; that income is gone forever
- Fixed costs continue during vacancy — Mortgage, taxes, insurance, and HOA payments don't pause when the unit is empty, so every vacant day costs real money
- Turnover costs compound the loss — Beyond lost rent, every vacancy event triggers $1,500-$4,000 in make-ready, marketing, and administrative expenses
- Extended vacancy can trigger lender concerns — On commercial loans or DSCR loans, prolonged vacancy can breach debt service coverage covenants and create refinancing problems
Watch Out
Never underwrite a rental at 0% vacancy. New investors sometimes project full occupancy to make the numbers work. If a deal only pencils at 0% vacancy, it doesn't pencil — every property will have turnover. Use 5% minimum for A/B markets with strong demand, 8-10% for C/D markets or properties with higher turnover. If you need 0% vacancy to break even, the deal is too thin.
Track your actual vacancy rate quarterly. Budget assumptions are starting points, not finish lines. Calculate your real vacancy rate every quarter: total vacant-unit days divided by total available-unit days. If you're consistently running above your budgeted rate, something is broken — your rents are too high, your make-ready process is too slow, or your tenant screening is letting in short-tenure renters.
Don't confuse physical vacancy with economic vacancy. A fully occupied building where two tenants haven't paid in 90 days has worse economics than a building with one empty unit and three strong payers. Economic vacancy — which includes non-payment, concessions, and loss-to-lease — is the number that actually hits your bank account.
Ask an Investor
The Takeaway
Vacancy is the tax every landlord pays for the privilege of rental income. You can't eliminate it, but you can control it — through fast make-ready processes, competitive pricing, strategic lease timing, and rigorous tenant screening that selects tenants who stay. Budget 5-8% of gross rent for vacancy loss in every deal analysis, track your actual vacancy rate quarterly, and never fall into the trap of underwriting at 0% occupancy loss. The difference between a 3% vacancy rate and a 10% vacancy rate on a $200,000 property collecting $1,800/month is $1,512/year in cash flow — real money that separates well-managed portfolios from struggling ones.