Getting Married in Japan as a US Citizen

In Japan, getting married is an act of paperwork, not a ceremony — you become legally married the instant a city office accepts your 婚姻届kon’in todoke, with or without a wedding. For a US citizen there are three cross-border wrinkles worth knowing before you go: you have to prove you’re free to marry with a document the US government doesn’t issue (and just changed how it handles), marriage by itself gives you no right to live in Japan, and marrying a non-American quietly rewires your US tax return. (For the family paperwork that often comes next, see Having a Baby in Japan.)

In Japan, the registration is the marriage

Japan has no concept of an officiant pronouncing you married. Under the Civil Code (Art. 739), a marriage takes legal effect when you file the notification — the 婚姻届kon’in todoke — at a city, ward, or town office and it’s accepted. A chapel ceremony, a shrine wedding, a 200-guest reception: none of those is the legal marriage. The filing is.

What it takes:

• The completed 婚姻届kon’in todoke form, signed by both spouses and by two adult witnesses (証人shōnin). The witnesses can be anyone aged 18 or over — friends, a parent — and they just sign; seals are now optional.
• Photo ID for whoever brings the form in.
• You can file at either spouse’s registered domicile or current address, on any day — offices accept the 婚姻届kon’in todoke around the clock at the after-hours window, which is why couples can pick a meaningful date as their official anniversary.

The marriage is effective the moment the office accepts the form — there’s no waiting period.

The document the US won’t give you — and the 2025 change

Here’s where Americans get tripped up first. Every foreigner marrying in Japan must prove they meet their own country’s legal requirements to marry — that you’re of age and not already married. Japan calls that proof a 婚姻要件具備証明書kon’in yōken gubi shōmeisho, a “certificate of legal capacity to marry.” Most countries issue one. The United States does not — there is no US “certificate of single status,” and no US equivalent of the Japanese family register (戸籍koseki) to draw it from.

For decades the workaround was a sworn Affidavit of Competency to Marry: you’d appear at the US Embassy or a consulate, swear before a consular officer that you were free to marry, and they’d notarize it. That ended on September 1, 2025. The embassy and consulates no longer notarize the affidavit. Instead:

• You download a statement (PDF) from the embassy explaining that the US government issues no such certificate, and you present that to your city or ward office.
• If your particular office won’t accept the PDF and insists on a notarized document, the embassy’s own suggestion is to use remote online notarization offered by some US states (several will notarize over video for citizens abroad).
• Whether the unnotarized statement is accepted is up to the individual office — some front-line clerks haven’t caught up to the change. Call your specific city or ward office before you go and ask exactly what they want.

Two practical notes. Anything in English you hand the office must come with a Japanese translation, and Japan lets you do the translation yourself as long as you note who translated it. And because the embassy was still mid-transition when this was written — its older “notarials” page even still listed the affidavit — check the embassy’s current “Marriage in Japan” page before you rely on any of this.

Marrying a Japanese national vs. another foreigner

The most common case is a US citizen marrying a Japanese national:

• Your Japanese spouse historically attached a copy of their 戸籍koseki to the 婚姻届kon’in todoke. Since March 2024, nationwide register linkage means that copy is often no longer required — but whether you still need it depends on where you file relative to their registered domicile, so ask the office.
• You bring your passport, the embassy statement (the capacity-certificate substitute) with its Japanese translation, and — some offices ask for this — your birth certificate with a translation. Your passport itself stands in as proof of nationality.

Two non-Japanese can also marry each other in Japan by this same route: each of you brings your own country’s capacity proof and passport, plus the two witnesses. (You also have the alternative of marrying through your own embassy by your home country’s method, in which case a Japanese 婚姻届kon’in todoke isn’t filed — but that’s a separate path, not a requirement.)

Your proof of marriage afterward

As soon as the office accepts your filing, ask for a 婚姻届受理証明書kon’in todoke juri shōmeisho — a “certificate of acceptance” that proves the marriage was registered. It’s your interim marriage certificate, and it’s specifically the document a foreign spouse uses to evidence the marriage — for immigration, a name change, a US bank. A plain copy is about ¥350; a decorative version about ¥1,400.

Keep two similar-looking terms straight:

• 婚姻要件具備証明書kon’in yōken gubi shōmeisho means “you’re eligible to marry” — the thing the US doesn’t issue.
• 婚姻届受理証明書kon’in todoke juri shōmeisho means “you did marry” — your actual proof.

Within a week or two, the marriage is written into your Japanese spouse’s 戸籍koseki, which becomes the durable record. As a non-Japanese you aren’t entered as a member of the register, but the marriage and your details are recorded in its remarks. For anything you’ll send back to the US, get a certified (or embassy-notarized) English translation of the 婚姻届受理証明書kon’in todoke juri shōmeisho or a copy of the 戸籍koseki.

The US side: recognized automatically, but nothing updates itself

Good news first: a marriage that’s valid in Japan is automatically valid in the United States. There’s no US federal registry of overseas marriages, the State Department keeps no record of them, and you never “report” your marriage to the embassy. Your Japanese 婚姻届受理証明書kon’in todoke juri shōmeisho (with a translation) is simply the proof, anywhere in the US, that you’re married.

The flip side: because nothing in the Japanese system talks to the US system, anything in your US name is yours to change. The 戸籍koseki won’t touch your US passport or your Social Security record. If you take your spouse’s name, you separately update your US passport (with the marriage certificate as evidence) and your Social Security card — neither happens by itself, and it’s worth keeping your Japanese residence-card name and your US passport name matched to avoid friction at banks and borders.

Marriage is not a visa

This one matters and routinely surprises people: marrying a Japanese national gives you no automatic right to live in Japan. The 日本人の配偶者等nihonjin no haigūsha tō (“Spouse or Child of Japanese National”) status of residence is a separate application to Immigration, granted only after they examine the marriage — they want to see a genuine, ongoing relationship, not merely a registered one, and they can refuse. When granted it comes in periods of 5 years, 3 years, 1 year, or 6 months, and must be renewed.

If you’re already in Japan on a work visa, you don’t have to switch to the spouse status — but it usually allows a freer life here (any kind of work, easier job changes) and it’s a faster track toward permanent residency. For that path, see Staying Long-Term in Japan.

The US tax turn: marrying a non-American

The quiet one. The day you marry, your US filing status changes — and if your spouse is Japanese (a “nonresident alien” in US terms), the default is awkward:

• Your default status becomes Married Filing Separately, which carries a very low filing threshold and disqualifies you from several tax breaks. Your spouse, as a nonresident alien with no US income, simply stays outside the US system.
• You can elect to treat your spouse as a US resident and file jointly, which can lower your rate. But the price is steep: it pulls your spouse’s entire worldwide income — their Japanese salary, their Japanese accounts — into the US tax net, and into your FBAR and FATCA reporting. For most Japan-based couples that’s a bad trade, and it’s a deliberate, hard-to-reverse choice — not a default to stumble into.
• Either way, to even list your spouse on a US return they need a US tax ID — an ITIN (Form W-7) if they’re not eligible for a Social Security number.
• And gifts between spouses aren’t unlimited when your spouse isn’t a US citizen. The unlimited marital exemption Americans assume doesn’t apply; instead there’s an annual cap ($190,000 for 2025). Move more than that to your spouse in a year — funding a joint home purchase, say — and you have a US gift-tax return (Form 709) to file. See Sending Money Between the US and Japan.

The takeaway: before you marry — or at least before your first joint tax year — get one cross-border tax conversation in. The choices made that first year (filing status, the resident-spouse election) are easy to get wrong and expensive to unwind. See Filing US Taxes from Japan.

The short version

• In Japan, the registration is the marriage — you’re married when a city office accepts your 婚姻届kon’in todoke (two adult witnesses required); no ceremony needed, no waiting period.
• The US won’t give you a “free to marry” certificate — and as of September 1, 2025 the embassy no longer notarizes the Affidavit of Competency to Marry. You download a PDF statement instead; if your office demands a notarized one, use a US state’s remote online notarization. Call your office first, and bring a Japanese translation.
• Your proof of marriage is the 婚姻届受理証明書kon’in todoke juri shōmeisho (then your spouse’s updated 戸籍koseki) — don’t confuse it with the eligibility certificate. Get a certified translation for US use.
• The US recognizes a Japanese marriage automatically — there’s nothing to report — but you must update your US passport and Social Security record if you change your name.
• Marriage isn’t a visa — the 日本人の配偶者等nihonjin no haigūsha tō status is a separate Immigration application that examines a genuine relationship.
• Marrying a non-American rewires your US taxes — default Married Filing Separately; the joint-filing election drags your spouse’s worldwide income into US tax (usually avoid); your spouse needs an ITIN; gifts to a non-citizen spouse are capped at $190,000/yr (2025).

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This guide is general information, not legal or tax advice. Marriage-registration requirements vary by municipality, US embassy procedures were mid-transition as of 2025, and the cross-border tax choices turn on individual facts — verify against the sources below, confirm requirements with your specific city or ward office and the embassy’s current page, and consult a cross-border tax professional before making the filing-status or gift decisions.