Margin analysis
The real cost of a vacant month
A vacant month gets filed in most owners' heads as "one month's rent." It is not. It is lost rent plus the cost of refilling the unit plus the carrying costs that never pause, and once you stack them the true bill on a single vacancy routinely runs two to three times a month's rent. Here is the whole stack, worked to the dollar.
Vacancy is the one loss that leaves no invoice. Every other cost on a rental arrives as a bill you can point at: the tax notice, the insurance renewal, the plumber. Vacancy just quietly removes a number that should have been there and adds a few small ones that should not have been, and because nothing lands in the mailbox, most owners price a vacant month at the rent they see on the lease and stop counting. That is the expensive mistake, and it is entirely an arithmetic one.
The honest way to price a vacancy is to build it as a stack, one line at a time, and to be careful about which lines are new money out the door and which are money that would have been paid anyway. Both matter, but they are not the same thing, and conflating them is how the internet's tidy "vacancy costs 1.5 to 2 times the rent" claim gets built. This guide builds the stack from the bottom and keeps the two apart.
The first lineLost rent is a daily number, not a monthly one
Start with the rent itself, because even this line is usually mis-stated. A vacancy almost never lands neatly on the first of the month and end on the last. It runs from the day the old tenant hands back the keys to the day the new tenant's rent starts, and that gap is measured in days. So the right unit for lost rent is the day, not the month.
That daily figure is what makes vacancy sneak up on owners. A turnover that "only took six weeks" is not a fraction of a problem. Six weeks is 45 days, and 45 × $59.18 = $2,663 of rent gone, which is already 1.5 months of rent before a single other cost is added. The calendar, not the lease, sets the size of the loss, and the calendar rarely cooperates.
The stackEverything a vacant month actually costs
Now build the full bill for one realistic vacancy on that $1,800 unit. The scenario: the tenant leaves, the unit needs a normal make-ready, it is marketed and shown for a few weeks, a new tenant is placed through a manager, and the whole gap runs about 45 days. The dollar inputs below are stated assumptions for one plausible property, not surveyed benchmarks; the market ranges they sit inside are sourced in the next section. Rerun it on your own actuals.
| Line | What it is | Amount |
|---|---|---|
| Lost rent, 45 days | 45 × ($21,600 ÷ 365) | $2,663 |
| Turn / make-ready | Paint, clean, minor repairs between tenants | $1,200 |
| Marketing and listing | Photos, syndicated listing, showing time | $150 |
| Leasing / placement fee | 75% of one month's rent to refill | $1,350 |
| Utilities shifted to owner | Power, water, gas the tenant used to pay, ~1.5 months | $180 |
| Total on one vacancy | Everything above | $5,543 |
Five thousand five hundred dollars, on a unit whose rent is eighteen hundred. The "one month" vacancy cost three months of rent, and nothing in the list is exotic. The single largest line is not even the lost rent; it is the two refill costs, the turn and the placement fee, which together come to $2,550 and land whether the gap is one week or ten. Those two lines are the reason a fast re-let still hurts and a slow one is a disaster: the fixed cost of refilling is paid in full at any speed, and only the rent line rewards you for moving quickly.
The honest correctionWhat is new money and what was owed anyway
Here is where most vacancy math quietly cheats, and where being straight about it is the whole point. That $5,543 mixes two different kinds of cost, and only one of them is caused by the vacancy.
The turn, the marketing, the placement fee, and the shifted utilities are incremental: they exist only because the unit went empty. That is $2,880 of genuinely new money out the door. The lost rent, $2,663, is real but it is an opportunity loss, income that failed to arrive, not cash you wrote a cheque for. Meanwhile the mortgage, the property tax, the insurance, and the HOA kept running through all 45 days, but those you owed whether the unit was full or empty, so they are not a cost of the vacancy at all. Counting lost rent and the carrying costs together, as the popular "two times rent" rule of thumb does, double-counts: the rent was supposed to cover the carrying costs, so you either lose the rent or you fail to cover the carrying, not both.
Why belabour this? Because the version that stacks carrying costs on top of lost rent produces scary numbers that fall apart the moment a sharp owner checks them, and a number that falls apart teaches nobody. The real figure is bad enough without inflation: one ordinary turnover on a modest unit is a mid-four-figure event, and it repeats every time a tenant leaves.
The compoundingHow a vacancy rate eats the annual return
A single vacancy is a shock. A vacancy rate is a tax, and it compounds against the thing that actually matters, the annual return, far harder than the raw percentage suggests. The trap is that owners read "7 percent vacancy" as "I keep 93 percent," when the loss lands on the thin layer of profit at the top, not on the whole rent roll.
Work it on the same unit. Suppose at full occupancy it throws off $3,600 of annual cash flow after every operating cost and the mortgage, a respectable result on a single door. Now introduce vacancy at three levels and watch what it does to that $3,600, not to the rent.
| Scenario | Days vacant | Lost rent | Refill cost | Total hit | Cash flow left |
|---|---|---|---|---|---|
| No turnover this year | 0 | $0 | $0 | $0 | $3,600 |
| One clean 21-day turn | 21 | $1,243 | $2,550 | $3,793 | −$193 |
| One 45-day turn | 45 | $2,663 | $2,550 | $5,213 | −$1,613 |
| Two turns in one year | 60 | $3,551 | $5,100 | $8,651 | −$5,051 |
Read the "cash flow left" column. A single fast, well-run 21-day turnover, the kind an owner would describe as a success, is enough to erase the entire year's profit and tip the door slightly negative. A 45-day gap does not cut the return in half; it puts the year $1,600 in the hole. This is the compounding that the headline vacancy rate hides: because the loss is charged against the profit layer and not the rent, a vacancy rate in the single digits can swing a positive year into a negative one. A property that "cash-flows" at full occupancy and turns its tenants even once a year may not cash-flow at all.
The lever this exposes is tenant tenure, not rent. Every extra year a good tenant stays spreads that $2,550 of fixed refill cost across more months and removes a shot at a 45-day gap entirely. A modest rent increase that pushes a reliable tenant out the door can cost more in one turnover than it gains in a year of higher rent, which is the exact trade the arithmetic above prices.
Where the vacancy stack meets the rest of the P&L
The daily rent figure and the fixed refill cost are the two numbers to carry out of here, because they connect straight to the other margins on the property. A vacancy is just occupancy failing, and every rental has a specific occupancy it must clear before profit exists at all; if that break-even occupancy is already high, there is almost no room for a turnover before the year goes red. And the refill costs, the turn and the placement fee, are two of the quietest lines in the whole operation, which is exactly the kind of cost that leaks the margin without ever announcing itself. Vacancy is not a separate problem from the profit-and-loss statement. It is the fastest-moving line on it.
A note on what we could not verify
The dollar inputs inside the worked examples, the $1,800 rent, the $1,200 make-ready, the $150 marketing, the $3,600 base cash flow, and the utility figure, are illustrative assumptions for a single plausible property, not surveyed benchmarks, and they are labelled as such in the tables. They demonstrate the method; substitute your own actuals before drawing any conclusion about your property. Only the market ranges attributed inline, the leasing fee as a share of a month's rent, the national vacancy rate, and the reported all-in turnover figure, are sourced claims, each checked against the publisher named beside it on 5 September 2026. Make-ready cost in particular varies so widely by unit condition and market that we quote it only as a modeled input, not a benchmark; no single figure for it could be traced to a primary source we were willing to stand behind.
Sources
- Property-management fee breakdown, Baselane, 2026 (baselane.com). Leasing or tenant-placement fees "typically range from 50–100% of one month's rent"; long-term management fees of 8 to 12 percent of monthly rent.
- Quarterly Residential Vacancies and Homeownership, second quarter 2026, US Census Bureau Housing Vacancy Survey, released 28 July 2026 (census.gov). "National vacancy rates in the second quarter 2026 were 7.3 percent for rental housing."
- Cost-of-vacancy analysis for landlords, Findigs, 2026 (findigs.com). Reports "each unit turnover costing approximately $4,000 in lost rent, concessions, and maintenance," and that a 7 percent vacancy rate can represent a 10 to 12 percent drain on potential revenue.