When one of my units sits empty for 45 days, most landlords do the same quick math I used to do: multiply the monthly rent by 1.5 and call that the damage. But after 15 years managing all 9 of my properties myself, I’ve learned that the real number is usually 30 to 40 percent higher than that simple calculation. Lost rent is just the headline cost u2014 the supporting costs are the ones that quietly eat your margin.
I started tracking vacancy costs line by line about seven years ago after a 90,000 yen shortfall confused me at tax time. Once I broke it down, I realized I’d been ignoring several categories of spending that only exist because a unit was empty. Here’s everything I now track, and how I keep it organized so it never surprises me again.
Lost Rent Is Only the Starting Point
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Say a unit rents for 78,000 yen a month and sits vacant for 50 days. That’s roughly 130,000 yen in lost rent. Most spreadsheets stop there. But that figure assumes the unit would have been occupied at full rent with zero turnover expenses, which almost never happens in practice. I now treat lost rent as one line among five, not the whole story, and I’ve found that landlords who only track this one number consistently underestimate their true vacancy losses by a wide margin.
Utilities You Keep Paying With Nobody Living There
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An empty unit still needs electricity for showings and occasional lighting, and in winter I run a small dehumidifier or minimal heating to prevent mold and condensation damage on the tatami and walls. Across my properties this runs 3,000 to 6,000 yen a month per vacant unit. On a 2-month vacancy that’s 6,000 to 12,000 yen that never shows up in a basic lost-rent estimate but comes directly out of my pocket every single time. I also keep the water running at a trickle in winter months to protect the pipes, which adds a small but real minimum charge even with zero usage.
Turnover Costs: Cleaning, Repairs, and Marketing
Between tenants I almost always do a deep clean myself to save the 25,000 to 35,000 yen a cleaning company would charge, but I still buy supplies u2014 tatami mat refresh sheets, wax for flooring, caulk for the bathroom u2014 that typically run 8,000 to 15,000 yen per turnover. Add in small repairs a departing tenant didn’t flag, like a sticking door or a dripping faucet, and I budget another 10,000 to 20,000 yen. On top of that, every time I list a unit I pay a listing fee to my property management partner equal to about half a month’s rent, plus photography touch-ups I do myself with my phone and basic editing to keep the online listing sharp. If a unit takes longer than 30 days to fill, I’ll sometimes drop the rent by 3,000 to 5,000 yen just to stop the bleeding, which is itself a cost worth tracking separately from the vacancy days themselves.
Financing Costs Don’t Pause for an Empty Unit
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This is the one that catches new landlords off guard. My mortgage payments, fire insurance, and property tax reserve keep accruing whether or not a tenant is paying rent. On a typical unit with a 65,000 yen monthly loan payment, a 60-day vacancy means I’m covering two full mortgage payments from savings or from other units’ cash flow. I treat this as an opportunity cost even when I’m not technically writing a new check, because it’s capital that isn’t earning anything during that stretch, and over 9 properties that opportunity cost compounds faster than most owners expect.
How I Track All of This in One Place
I used to keep vacancy notes scattered across text messages and receipts, which made it impossible to see the true cost of any single vacancy. Now every empty unit gets its own row in a tracking sheet with these categories:
- Lost rent (days vacant times daily rate)
- Utilities paid during vacancy
- Cleaning supplies and turnover repairs
- Marketing, listing fees, and rent reductions offered to fill faster
- Mortgage and tax carrying cost for the vacancy period
Adding these up on a recent 62-day vacancy showed a total cost of about 168,000 yen against a lost-rent estimate of only 129,000 yen u2014 a 30 percent gap that would have gone completely unnoticed under my old method. Once I started seeing that gap on paper, it changed how aggressively I price rent renewals and how quickly I move on repairs before a tenant moves out, since delaying even a week can now be measured in real yen rather than a vague sense of urgency.
What I Do Differently Now
Since I started full-cost tracking, I’ve cut my average vacancy period from around 38 days down to 24 days across my portfolio, mainly by starting the re-listing process 30 days before a known move-out instead of waiting until the keys are returned. I also now keep a small reserve fund per property, about 50,000 yen, specifically earmarked for vacancy-related expenses so they don’t quietly drain my operating cash flow without me noticing. It’s a small habit, but it turned vacancy from a vague dread into a number I can actually plan around.
That’s the approach I use across all 9 of my properties, and it’s the difference between guessing at vacancy losses and actually managing them.
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15 years of landlord experience u00b7 3 apartment buildings u00b7 DIY renovations that saved millions of yen. Browse all articles at diytosan.com
