Buying a home in Japan as a US person: the mortgage, and the yen-loan tax trap nobody warns you about
The short version. Foreigners can get a mortgage in Japan, but the practical gates are permanent residency (or a Japanese spouse), one to three years of stable local employment, and paperwork that is entirely in Japanese. The part almost nobody mentions: a yen-denominated mortgage is a foreign-currency debt in the eyes of the IRS. Under IRC §988, repaying or refinancing that loan after the yen has weakened can create a taxable FX gain — ordinary income on your US return — even though you received no cash and, in yen, nothing happened. Whether ordinary monthly payments trigger this is genuinely disputed among cross-border preparers, so it’s a question to raise before you sign, not after. I’m writing this from my own research and from owning a home in Japan myself — not as tax advice.
I’m Jin. I’m Japanese, I spent four years working in US manufacturing, and I own a house in Japan. So I’ve paid Japanese property taxes firsthand, and I’ve spent a lot of time researching the US-tax side for readers who are moving the other way — Americans buying in Japan. That second half is where the expensive surprises hide.
Can foreigners actually get a mortgage in Japan?
Yes, but access is tiered. Lenders care about your residency status, how long you’ve held a stable Japanese job, and whether you can handle Japanese-language documents.
| Your situation | Realistic access | Typical terms |
|---|---|---|
| Permanent resident (or married to a Japanese national) | Treated roughly like a citizen by most major banks | Down payment closer to standard; approval ~2–4 weeks |
| Non-PR resident, 1–3 yrs stable local employment | Possible with foreigner-friendly lenders | Down payment often 20–30%; approval ~4–8 weeks |
| Short tenure / unstable income | Difficult | Expect rejection or steep conditions |
The government-backed Flat 35 program is, in practice, restricted to citizens and permanent/special-permanent residents. Names that come up repeatedly as more foreigner-friendly are Suruga Bank, Aeon Bank, and SMBC Prestia — but bank policies change without notice, so treat those as examples to call, not guarantees. Rates as of my research run roughly 0.18%–1.4% (needs verification — confirm directly with lenders before acting), which is cheap by global standards. All the loan paperwork is Japanese.
The trap nobody warns you about: your yen mortgage is a US tax event
To the IRS, a yen mortgage isn’t just a mortgage — it’s a §988 foreign-currency debt obligation. When the yen weakens against the dollar between the day you borrow and the day you repay, you pay back fewer dollars than you borrowed. The IRS can treat that difference as a taxable FX gain, taxed as ordinary income at your marginal rate (reported on Schedule 1, Form 1040, Line 8z).
A simplified illustration:
| Event | Yen | USD/JPY | Dollar equivalent |
|---|---|---|---|
| Borrow | ¥30,000,000 | 110 | $272,727 |
| Repay same balance | ¥30,000,000 | 150 | $200,000 |
In yen, nothing changed. In dollars, repaying cost you ~$72,727 less than you borrowed — and that “gain” can be ordinary income on your US return. No cash ever hit your account.
Two things make this genuinely dangerous:
- A refinance is a hidden trigger. Refinancing when the yen is weaker than at origination can crystallize the gain on the old, extinguished loan — people never see it coming.
- The primary-residence exclusion won’t save you. Section 121 shelters the gain on the property; the mortgage FX gain is a separate event it doesn’t touch.
Now the honest part. Whether each ordinary monthly amortizing payment is its own realization event, and how §988(e)(3)‘s “personal transaction” carve-out applies to a home loan, is an area where cross-border practitioners genuinely disagree. What’s clear: FX gains are taxable, while losses on a personal loan may not be deductible — an asymmetric whipsaw. This is the same posture the site takes on currency gains everywhere else (see spending USD in Japan under a weak yen): I don’t pretend it’s settled. Put it in writing to a US–Japan preparer before you sign. Getting this wrong can turn a phantom $70K into a five-figure ordinary-income tax bill — an hour of professional time up front is cheap insurance.
What it costs to buy and hold in Japan
Budget ~5% of the purchase price in transaction costs on the way in, then recurring annual taxes. Assessed value (固定資産税評価額) is usually below market price, which softens the tax figures.
| Item | Rate (on assessed value unless noted) |
|---|---|
| Real estate acquisition tax (residential) | 3% (reduced rate through Mar 31 2027) |
| Registration tax — ownership | 0.4% (higher for mortgage registration) |
| Agent commission | up to 3% of price + ¥60,000 + 10% tax |
| Fixed asset tax (固定資産税) — annual | 1.4%, billed to whoever holds title on Jan 1 |
| City planning tax (都市計画税) — annual | up to 0.3% |
I pay that annual fixed asset tax on my own place. The first thing to internalize: it never stops — ownership has a running cost baked in.
Buy vs rent doesn’t work the way it does in the US
This is the structural difference Americans get wrong. Japanese tax law assigns statutory useful lives to buildings — 22 years for wood, 47 years for reinforced concrete — and the building depreciates while the land does not. An older wooden house can have a near-zero book value on the structure, with the residual value sitting entirely in the land.
So you can’t assume Japanese real estate appreciates like a US home. The structure you live in is losing value on a schedule; the land under it may appreciate — major metros like Tokyo, Osaka, and Fukuoka have kept climbing — or may not, depending on location. The US “buy-vs-rent break-even” model doesn’t transfer unless you split land and building and treat them as two different assets. My own honest take, as someone who owns here: buying can be right for reasons that aren’t purely financial, but don’t tell yourself the building is a nest egg. It usually isn’t.
The Japanese mortgage deduction (住宅ローン控除)
Japan offers a real perk: a deduction of 0.7% of your year-end loan balance, claimable annually for up to 13 years on qualifying new homes (10 for some existing homes — needs verification).
- You must actually live in the property — move out (including abroad) and the deduction stops. It isn’t recaptured, but future years are gone.
- Floor area generally ≥ 50 m²; total income must stay under ¥20 million (~$133K at 150).
- Critical for US persons: this reduces your Japan-side tax only. It is not a US credit or deduction. Coordinating Japanese and US tax is exactly the kind of thing that trips people up in their first tax year after leaving the US.
If you later leave: selling as a non-resident
Say you buy, then move on. Selling Japanese property as a non-resident triggers two separate machines:
- Japan side: the buyer must withhold and remit 10.21% of the gross sale price (not the gain) to the tax office as an advance payment. You appoint a tax agent (納税管理人), file between Feb 16–Mar 15, and often get a partial refund — 10.21% of gross frequently exceeds the 20.315% long-term capital-gains rate on your actual net gain.
- US side: computed entirely in dollars, using the spot rate on your purchase date for basis and the sale date for proceeds. In a weak-yen environment your USD gain can be far smaller than your yen gain — or even a USD loss while you show a yen gain. The §988 mortgage FX gain is calculated separately from the property gain.
Keep clean records of the exchange rate on every relevant date. When you actually move money, a service like Wise makes the real conversion rate easy to document — which matters when your US basis depends on it. This two-currency, two-rate mess is the same reason Japanese pooled funds bite US persons as PFICs: the US tax code doesn’t care that, in yen, everything looked fine.
FAQ
Can foreigners get a mortgage in Japan without permanent residency?
Sometimes — with a Japanese spouse or one to three years of stable local employment, and usually a larger down payment (often 20–30%). Permanent residents get much smoother access. Confirm current terms directly with individual lenders; published summaries go stale fast.
Does the yen mortgage FX gain apply even to my own home?
The gain is taxable regardless — the primary-residence exclusion (§121) shelters the property gain, not the loan’s currency gain. Whether ordinary monthly payments each trigger it, and how the “personal transaction” rules apply, is disputed. Get it in writing from a US–Japan preparer before signing or refinancing.
Is buying in Japan a good investment like it is in the US?
Not automatically. The building depreciates on a fixed schedule (22 years wood, 47 concrete) while only the land may hold or gain value. Separate the two before you run any buy-vs-rent math — the US appreciation assumption doesn’t hold.
This reflects my own research and lived experience as a Japanese homeowner, not investment or tax advice. Cross-border property tax is genuinely unsettled in places — confirm against official NTA/IRS pages and a professional who handles US–Japan cases before you act.