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  • For Spouses

How Japan Taxes Your 401(k) and IRA: What Changes the Day You Become a Resident

By Dako A 401(k) is an American object. It lives at an American custodian, follows American rules, and reports to the IRS on American forms. Ask most people in our position what happens to it after a move to Japan…

  • Dako
  • 2026年9月21日
  • For Spouses

Joint Finances Across Two Tax Systems: A Practical Guide for Mixed-Nationality Couples

One Pot, Two Tax Systems

By Dako & Jay Nearly everything we own has both our names on it. The checking account, the savings, the taxable brokerage. The retirement accounts are the exception, and only because the law insists they belong to one person each.…

  • Dako
  • 2026年9月17日
  • Exit Tax & Green Card

US Exit Tax vs Japan Exit Tax: Two Different Taxes People Confuse

Two Exit Taxes, Two Different Triggers

By Dako Somebody in a forum thread will tell you Japan has an exit tax. Somebody else will tell you the US has one. Both are right. If you’re a household like ours, one American passport, one green card, a…

  • Dako
  • 2026年9月14日
  • Portable Wealth

US-Japan Tax Treaty Basics for Cross-Border Households

What Does the Tax Treaty Actually Do?

By Dako Somewhere in the back of my head, for years, lived a comforting sentence: there’s a tax treaty, so we’ll be fine. Move to Japan, split our lives across two countries, whatever. The treaty would catch us. Recently I…

  • Dako
  • 2026年9月10日
  • For Spouses

Inheritance Law Differences: What Non-Japanese Spouses Need to Know Before Moving to Japan

Whose Law Decides Who Inherits?

By Dako On paper, we’re the prepared couple. We have a trust. The wills are signed, and so are the powers of attorney. I’d filed “what happens if one of us dies” under handled, the way you file a fire…

  • Dako
  • 2026年9月7日
  • For Spouses

What Is an Apostille and When Do You Need It: A US–Japan Family’s Guide

What Is an Apostille? A US–Japan family's guide to getting one in time

By Dako The word usually arrives in a sentence that also contains a deadline. Some office on the Japanese side of your life, a city hall, a bank, a legal affairs bureau, asks for a US document, and then adds…

  • Dako
  • 2026年9月5日
  • Our FIRE Journey

Our FIRE Number in Two Currencies: Planning Retirement Spending in Yen

Our FIRE Number in Two Currencies — planning retirement spending in yen

By Dako & Jay We have a FIRE number. It’s in dollars, because every account we own is in dollars. Two 401(k)s. A taxable brokerage of US-listed funds and US stocks, a traditional IRA, a Roth, an HSA, a high-yield…

  • Dako
  • 2026年9月3日
  • Exit Tax & Green Card

Keeping Your Green Card for a Dual-Base Life: The Real Tax Cost of Not Deciding

The Real Cost of Keeping the Card — green card, dual-base life, and the clock you can't pause

By Dako For a long time I filed the green card question under “not urgent.” We haven’t decided whether we’re moving to Japan, splitting the year, or staying put. So the card just sits there, doing its job, waiting for…

  • Dako
  • 2026年8月31日
  • For Spouses

Navigating Japanese Bureaucracy When You Don’t Speak Japanese: A Survival Guide

Featured image: Navigating Japanese Bureaucracy When You Don't Speak Japanese — Two Countries, One Plan (For Spouses)

By Jay Let me describe my role in Japanese government offices, because “survival guide” implies more heroism than I can honestly claim. Dako walks up to the counter. Dako talks. The person behind the counter talks back. Papers appear, get…

  • Dako
  • 2026年8月27日
  • Portable Wealth

Splitting the Year Between the US and Japan: Who Counts You as a Tax Resident?

Featured image: Splitting the Year Between the US and Japan — Who Counts You as a Tax Resident? Two Countries, One Plan (Portable Wealth)

By Dako The dual-base dream has a specific shape in our house: cherry blossoms and my parents’ kitchen for part of the year, our life in the US for the rest. Somewhere along the way of imagining it, the unromantic…

  • Dako
  • 2026年8月24日
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