United States

Due to the US using the rare method of taxing its citizens and people with permanent residency whether they are resident in the US or not, the options for US investors are different than for non-US investors.

Although PFIC rules make investing in non-US funds impractical, it may be possible to invest in Japan-domiciled mutual funds as part of a corporate DC pension plan. See the discussion on the Retire Japan forum.

SOFA

• The Immigration Control and Refugee Recognition Act does not apply to people who are resident in Japan under the Wikipedia:U.S.–Japan Status of Forces Agreement.
• People who lose their SOFA status and want to remain in Japan will need to apply to acquire a status of residence.

See Also

• US Citizens and Green Card Holders on RetireJapan.com
• Investing from Japan for US citizens and US permanent residents on the Bogleheads wiki
• US Page on Reddit's r/JapanFinance community

Credits

Many thanks to the following RetireWiki.jp users for writing this article:

Adamu