I may be wrong but if you were born in the US, which I assume you were since you hold a US passport but you were registered at birth in Japan in your family registry, I think you can register in Japan as a Japanese because of your parents' family registry. Thus doing so, you will automatically verify your Japanese citizenship. While living in Japan you would need to live as a Japanese national, paying Japanese taxes, retirement, and the National Health Insurance on your income in Japan. You would also file with the IRS but you would get a $78,000 foreign income exclusion if you qualify. About trading income from the US.....I'm not sure about........
If you are a US citizen, holding a trading account in the US but live in Japan and daytrade, what rate are you taxed for capital gains?
Yes, the U.S. does allow dual citizenship. In the past, you needed to choose which citizenship you wanted to keep when reaching 18 years of age. The US changed this many years ago. BTW, I have two citizenships... SCM
Yes, the US does but Japan does not. My understanding is that a Japanese citizen who acquires another citizenship loses his/her Japanese citizenship. I have known Japanese green-carders in the US who did not naturalize because they didn't want to lose their Japanese citizenship. Elvis
Yes, I believe the Japanese gov't doesn't recognize nor allow dual citizenship. If you were in the US and your parents are from Japan and you were registered in the 'family registry' in Japan, you may maintain both but when in Japan, reside as a Japanese National. When travelling in or out of Japan, you must use your Japanese passport.