Every time I take out a loan for a new rental purchase or a big renovation, my bank hands me the same two offers: a 15-year term at a slightly lower rate, or a 25-year term that drops my monthly payment by close to 38,000 yen. I have made this call more than a dozen times across my 9 properties over the past 15+ years, and I stopped deciding by gut feeling a long time ago. Now I run the same three checks every single time before I sign anything.
The right answer is almost never obvious, and it is not just about who can brag about paying off a mortgage faster. It comes down to cash flow, how long I plan to hold the property, and how much cushion I have if a tenant moves out or a water heater dies at the worst possible moment.
The real cost difference, not just the monthly number
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On a recent 12 million yen loan for a renovation, the bank quoted me 1.2% over 15 years or 1.6% over 25 years. The 15-year option came to roughly 71,500 yen a month. The 25-year option came to about 48,900 yen a month. That 22,600 yen gap looks small until you multiply it out: over the life of the loans, the 25-year term costs me around 1.9 million yen more in total interest. I always ask the bank for both amortization tables side by side before I decide, because the monthly figure alone hides that gap completely. Banks also tend to price shorter terms at a lower rate in the first place, since they are taking on less risk over a shorter window, so the true cost gap is usually bigger than the headline rate difference suggests.
When I choose the shorter term
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I go shorter when a property already has strong, stable occupancy and I want to own it outright before I slow down. Two of my 9 units are fully paid off now because I pushed hard on 15-year terms in years when rent income was solid. Building equity faster also matters if I want to refinance later and pull cash out for the next purchase; a property with 60% equity gives the bank much more confidence than one sitting at 20%. If my reserve fund already covers 6 months of expenses on that property, the higher payment does not scare me. I also lean shorter on smaller loans, under about 8 million yen, where the payment gap between the two terms is only a few thousand yen a month and the interest savings are worth locking in.
When I choose the lower monthly payment instead
I go longer when I am stretching to close on a new property and want breathing room. A vacant unit for even 2 months can wipe out a tight cash flow margin fast, so a lower fixed payment gives me a buffer while I find a tenant. It also matters when I know a big repair is coming; I once had a roof replacement quoted at 850,000 yen right after taking on a new loan, and I was glad my payment was the lower of the two options that year. Lower payments also make sense on properties I expect to sell within 7 to 8 years, since I will not be around long enough to benefit much from the faster payoff anyway.
A 20-year term taught me to stop splitting the difference
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Early on, around property number 3, I tried to compromise by picking a 20-year term instead of choosing properly between the two extremes. It felt balanced at the time, but it gave me neither the low payment I needed during a slow leasing season nor the interest savings a 15-year term would have delivered. I ended up refinancing that loan 4 years later, which cost me roughly 180,000 yen in fees and paperwork time. Since then I only compare the two real options, short or long, and pick based on the checklist below rather than reaching for a middle ground that solves nothing well.
The checklist I run before signing
Before I pick a term, I walk through the same short list every time. It takes about 20 minutes and has saved me from at least 2 loans I would have regretted.
- Current occupancy and rent stability on the property being financed
- Cash reserves on hand, in months of expenses covered
- Planned holding period, roughly under 10 years or over 10 years
- The actual rate difference between the two terms, not just the payment difference
- Upcoming major repairs already known about, such as roofing or plumbing
- How close I am to wanting to reduce my total debt load before retirement
My rule of thumb after 9 properties
If the shorter term pushes my monthly payment cushion below 15% of rental income, I go longer, no exceptions. If a property is fully occupied, has a healthy reserve, and I plan to hold it more than 10 years, I lean toward the shorter term almost every time. Anything in between gets the full checklist treatment rather than a quick decision at the loan desk, and I would rather spend 20 extra minutes with an amortization table than spend the next 15 years regretting a payment I chose in a hurry. That’s the approach I use across all 9 of my properties, and it’s kept me from overextending on any single one of them.
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