Depreciation vs Loan Principal: Surviving the Dead Cross on a Japanese Rental

When I bought a wood-frame unit built in 1998 for 9.8 million yen, my tax accountant circled a month on the projection sheet: January 2024. That was when the building depreciation would run out, and my monthly cash flow on that one unit was set to drop by about 38,000 yen. The rent was still 62,000 yen. The tenant had not moved. Nothing about the building had changed. The only thing that changed was that I could no longer deduct the structure, and my tax bill on that property jumped while the cash in my account did not.

Landlords in Japan call this the dead cross, and if you buy older wood-frame buildings on a loan, you will meet it. Over 15 years and 9 properties I have walked into it three times. Here is exactly what happens, why wood-frame units hit it so fast, and the two moves that pulled that unit back from a 38,000 yen monthly hole to roughly a 9,000 yen one without touching the rent.

What the Dead Cross Actually Is

Your loan payment splits into interest, which is tax-deductible, and principal, which is not. Your depreciation is a paper expense that lowers taxable income without costing you cash. Early in a loan, depreciation is large and the principal portion of your payment is small, so your taxable income sits below your real cash flow and life feels comfortable. Over time two things move against you at once. The principal portion of every payment grows each year, and the depreciation eventually stops entirely. The point where non-deductible principal repayment overtakes your remaining depreciation is the dead cross. After it, you are paying income tax on money you never actually received, because it went straight to the bank as principal.

Why Wood-Frame Units Hit It So Fast

The statutory useful life for a wood-frame residential building in Japan is 22 years. When you buy one that is already past that age, the simplified method gives you a depreciation period of just 4 years. Buy one that is 20 years old, like mine, and you get 6 years. Either way, the clock is short. My building portion worked out to 4.2 million yen of the 9.8 million yen price, written off over 6 years at 700,000 yen a year. That deduction was doing a lot of work, and I always knew it had an expiry date. An RC building bought new depreciates over 47 years, so the same investor barely notices the effect. On a 1998 wood-frame unit, it arrives like a wall.

The Numbers on My Own Unit

Here is what the projection looked like on that property in the two years straddling the cross:

• Annual rent: 744,000 yen, unchanged before and after
• Depreciation through 2023: 700,000 yen a year, then 0 from 2024
• Loan interest deduction: about 190,000 yen in 2023, falling to about 150,000 yen by 2025 as the balance dropped
• Annual loan principal repayment: about 470,000 yen in 2023, rising past 500,000 yen after
• Extra taxable income created at the cross: roughly 740,000 yen a year
• My combined marginal rate at the time: about 43 percent, so an added tax bill near 320,000 yen a year, close to 27,000 yen a month, with the shrinking interest deduction adding the rest of that 38,000 yen gap

None of this showed up as a rent problem. It was purely a tax-timing problem, and it would have quietly eaten a third of my cash flow on the unit.

Why I Did Not Just Raise the Rent

The obvious answer is to push rent up 5,000 yen and move on. I did not, for a specific reason. That tenant had been in place four years, always paid by the 27th, and comparable units nearby were only asking 2,000 to 3,000 yen more than mine. Raising rent by enough to cover a 38,000 yen monthly swing was never realistic, and even a modest increase risked a turnover. A vacancy on that unit costs me about one month of rent plus 90,000 yen in cleaning, small repairs and re-listing. Chasing a tax problem with a rent hike that triggers a move-out is how you turn a paper loss into a real one.

The Two Moves That Closed the Gap

First, I refinanced the remaining balance. In late 2023 the loan had about 5.9 million yen left with 7 years to run at 2.6 percent. A local shinkin bank took it over at 2.1 percent stretched back to 14 years. That single change dropped the annual principal repayment from over 500,000 yen to about 330,000 yen. It means paying interest for longer in total, but it directly shrinks the non-deductible chunk that drives the dead cross, and it freed up cash every month starting immediately.

Second, I brought forward a capital improvement I was going to do anyway. The unit bath was original and tired, so I had it replaced for 680,000 yen. Equipment like that depreciates over about 15 years, which gave me a fresh deduction of roughly 45,000 yen a year, plus the interest on the small loan I used to fund it. It is not a huge number, but stacked on the refinance it was enough. The combined effect brought the monthly cash flow hit down from 38,000 yen to about 9,000 yen, and the unit now shows better for the next tenant too.

A Checklist I Now Run Before Buying Older Wood-Frame

The dead cross is survivable, but only if you see it coming before you sign. On every wood-frame building over 20 years old, I now do this first:

• Calculate the exact depreciation period under the simplified method and mark the year it ends on a calendar
• Build a year-by-year table of principal repayment versus depreciation and find the crossover year
• Confirm the crossover lands at least 5 years out, or negotiate the price down to compensate
• Check whether the loan term can realistically be extended later at that bank or another
• Keep a cash reserve of at least 6 months of that unit’s payments to ride out the transition year
• Plan one capital improvement to land near the crossover so a new deduction starts as the old one ends

That last point has become a habit. I now schedule water heaters, unit baths and kitchen swaps not just by age but by tax year, so the deduction shows up when I need it most.

The dead cross caught me by surprise on my second property years ago, and it cost me a nervous tax season before I understood it. On this one I saw it coming from six years out, and it turned into a spreadsheet exercise instead of a crisis. That is the approach I now use across all 9 of my properties.

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