A landlord owns 12 rental units. Ten of them are rented. Two have sat empty for two months, and each empty month costs 1,400 dollars in lost rent.
That is 2,800 dollars a month gone, before mortgage, tax, insurance, and maintenance. The landlord asks a simple question. How bad is this, really?
Vacancy rate answers that question with one number. It tells you what share of your rental space is empty, how much rent you are losing, and whether your rent, your marketing, or your market is the problem.
This guide gives you the formula, a worked example, and the decision that follows from the number.
What Is the Short Answer?
Vacancy rate is the percentage of your rental units, or rental time, that is empty and not earning rent.
A low rate usually means strong demand, or rent that is priced well for the market. A high rate usually means rent is too high, marketing is weak, turnover is slow, or the local market is soft.
A rate of zero sounds perfect. It is not always good. Zero vacancy can mean rent is far below market, and you are leaving money on the table every month.
The Formula, in Plain Terms
Vacancy rate equals vacant units divided by total units, multiplied by 100.
Write it like this: vacancy rate = vacant units / total units x 100.
For a single property over time, use days instead. Vacancy rate equals vacant days divided by total available days, multiplied by 100. That version catches a unit that is empty for part of a year, not just on one count date.
A Numbered Example, Step by Step
Take a landlord with 12 units. Two units are vacant on the count date. Ten units are rented.
Step 1: divide vacant units by total units. Two divided by 12 equals 0.1667.
Step 2: multiply by 100. That gives 16.7 percent. That is the vacancy rate.
Now add dollars. Each unit rents for 1,400 dollars a month. Two vacant units mean 2,800 dollars lost that month. Over a year, if those units stay empty, that is 33,600 dollars lost.
Now take the same landlord with one vacant unit instead of two. One divided by 12 equals 0.0833, or 8.3 percent. Lost rent falls to 1,400 dollars a month, or 16,800 dollars a year.
Halving vacancy halves the loss. That is why a small change in rate matters far more than it looks on a chart. A landlord who cuts vacancy from two months to two weeks saves real money fast. At 1,400 dollars a month, two weeks empty costs about 650 dollars, not 2,800 dollars, and that gap pays for better photos, a faster listing, and a quicker showing schedule.
A Second Example, Using Days
Take one single family rental, available for 365 days in a year. It sits empty for 45 days between tenants, for cleaning, repairs, and marketing.
Divide 45 by 365. That equals 0.1233, or 12.3 percent. That is the time based vacancy rate for that home.
If rent is 1,800 dollars a month, or about 60 dollars a day, 45 empty days cost about 2,700 dollars. That cost is real, even though the home is rented for the other 320 days.
What Does a High Vacancy Rate Tell You?
A high rate is a warning, not a verdict. It tells you to check four things, in order.
First, check rent. If similar units nearby rent for 1,300 dollars and yours is listed at 1,600 dollars, the market has already told you the answer. A 300 dollar gap will keep a unit empty far longer than a better listing photo will fix.
Second, check marketing. Is the listing on the sites tenants actually use?
Are the photos current? Is the description honest about size, parking, and pets? A unit that no one sees cannot be rented, whatever the price.
Third, check condition. A unit with a broken appliance, stained carpet, or a smell that hits you at the door will lose to a cleaner unit at the same rent, every time. Tenants decide in minutes, not after a careful spreadsheet.
Fourth, check turnover time. If cleaning and repairs take six weeks after every move out, your vacancy rate will stay high even with strong demand. A two week turnover, with a cleaner booked before move out day, can cut vacancy sharply.
How Vacancy Rate Affects Cash Flow
Vacancy hits cash flow twice. First, rent is missing. Second, fixed costs keep running.
Mortgage, tax, insurance, and maintenance do not pause when a unit is empty. A landlord with 12 units and two empty still pays the same building costs, spread over ten paying tenants instead of twelve.
What Does It Cost If You Do Nothing?
Doing nothing about a high vacancy rate costs rent every month, and it can cost more than rent.
An empty unit still needs heating in winter, security, and basic upkeep. Pipes can freeze, leaks can go unnoticed, and vandalism is more likely in a building that looks empty.
A landlord who waits six months to cut rent by 100 dollars, while losing 1,400 dollars a month in rent, has lost 8,400 dollars to save 600 dollars in rent over those six months. That maths rarely works, once you write it down.
State Variation You Must Check
Vacancy itself is a market number, but the rules that create vacancy vary by state. Notice periods, eviction timelines, and rent rules all change how long a unit stays empty.
California notice rules and local rent rules can lengthen turnover, especially in rent controlled cities. A landlord there should plan for longer gaps between tenants, and check city rules before setting a move out date.
Texas generally has shorter notice and eviction timelines than California or New York, which can shorten turnover, but it also has its own notice forms and deadlines that must be followed exactly. A mistake in a notice can add weeks to a vacancy.
New York, especially New York City, has strong tenant protections and longer court timelines. A disputed eviction there can keep a unit in legal limbo for months, and that time counts as vacancy in cash flow terms, even if the unit is not listed as available.
Florida has its own notice periods and a seasonal rental market in many areas. A unit that is hard to rent in summer may rent quickly in winter, and an annual vacancy rate can hide that swing.
Check your state notice rules before you plan turnover. Notice to vacate rules, deadlines, and tips explain what a valid notice must contain, and a valid notice is the fastest lawful way to start a turnover.
What If Your Vacancy Is Seasonal?
Seasonal vacancy is not the same as a pricing problem. A beach town unit may sit empty in winter and rent in days in summer, and an annual rate will hide that swing completely.
Track seasonal properties by month, not just by year. Compare this January to last January, not to last July. That comparison tells you whether the market moved, or whether the season simply changed.
How to Lower Vacancy Rate, Step by Step
Step 1: price from the market, not from your costs. Tenants pay market rent, not your mortgage. If market rent is below your costs, that is a buying problem, not a pricing problem.
Step 2: list the unit before it is empty, where the law and the lease allow it. Photos of a clean, staged unit, taken before move out, rent faster than photos taken after a tenant has left and the unit is bare.
Step 3: shorten turnover. Book cleaners and repair workers before move out day. Have paint, locks, and basic parts ready. A unit that is ready in seven days rents sooner than one ready in seven weeks.
Step 4: screen quickly and fairly. A slow screening process loses good applicants to faster landlords. A fair, consistent process, applied to every applicant, also protects you from discrimination claims.
Step 5: keep good tenants. A small, lawful rent increase, a fast repair response, and clear communication keep a tenant longer than a discount on a new listing. Retention is the cheapest way to cut vacancy.
How Eviction Affects Vacancy Rate
Eviction is one of the most expensive causes of vacancy, because it combines lost rent, legal costs, and a long gap before a new tenant moves in.
A tenant who stops paying, then fights an eviction, can leave a unit empty for months while the case runs. During that time, rent is missing, legal fees grow, and the unit cannot be listed to a new tenant.
How long does the eviction process really take gives a realistic timeline, and that timeline should be part of your vacancy planning, not a surprise after a case starts.
If a case is filed, the eviction process step by step guide for tenants explains hearings, defenses, and timelines from the tenant side, which helps a landlord understand why a case may take longer than expected.
Should You Count a Unit Under Repair as Vacant?
Yes, if it cannot be rented. A unit under repair is not earning rent, whatever the reason it is empty. Counting it as occupied hides the cost of slow repairs.
Track vacancy by cause, month by month. Marketing problems need better listings.
Repair problems need faster contractors. Eviction problems need better screening and earlier communication. One rate, three different fixes.
Common Mistakes Landlords Make With Vacancy Rate
The most common mistake is counting only the count date. A building with two units empty on the first of the month, but rented by the tenth, looks worse on a count date than it really is. Use the days version as well, for the full picture.
Another mistake is ignoring partial months. A unit rented on the 20th was vacant for 19 days that month. That loss is real, even if the month end count shows zero vacancy.
A Practical Checklist for Landlords
Calculate vacancy every month, the same way, and record it by cause. Compare it to similar properties in your area, not just to last month.
Price from market evidence, list early, shorten turnover to days not weeks, and screen quickly and fairly. Keep good tenants with fast repairs and clear communication.
The Bottom Line
Vacancy rate is a simple number with a hard message. It tells you, in one percentage, how much rent you are losing, and whether your rent, your marketing, your turnover, or your market is the cause.
A landlord who tracks it monthly, by cause, and acts on it quickly, will lose less rent than a landlord who checks it once a year and wonders where the money went.
Price from the market, turn units over in days, keep good tenants, and treat eviction as a last resort, not a first response. That is the decision rule behind the formula, and it is what turns a vacancy number into cash flow.
