If I understand your situation correctly you have an inherited IRA. There is no step-up in cost basis for an inherited IRA in the US and Japan doesn't have a step-up in basis for inherited financial assets. Although there is some debate about how Japan taxes IRA accounts, I doubt that you can get a step-up in basis for an inherited IRA that would have meaning in either the US or Japanese tax systems.japantous wrote: ↑Tue Nov 28, 2023 2:54 am After talking with the US-side financial planners, I believe I will take a withdrawal of a certain % of the IRA in Jan 2024, before moving back to Japan. For the 2024 tax year I should be earning close to nothing in the US in terms of wages, so this makes sense from a tax bracket perspective.
They will look into doing an adjustment called a step-up in basis, in which the original cost of shares, etc. is adjusted to the price at the date of the decedent's death. This could help reduce capital gains tax in Japan.
I think the most common practice for couples who have only one of the spouses in the US tax system is to file MFS. If you don't your foreign spouse is subject to the same tax reporting requirements and limitations regarding things like PFIC's that we US persons face. However, if your wife is the equivalent of a "green card" holder (long term US resident) she has to file form I-407 to give up her US tax status. She hasn't actually left the system and its reporting requirements just because she leaves the country or the green card expires. If she has not had a green card then she leaves the US system more easily but you may want to just confirm that this is not an issue for you.One interesting point is the question of filing status for US taxes. My wife is Japanese, so for 2023 we will file as Married filing Jointly. Once we are back in Japan, it seems like it's the norm to file US taxes as Married filing Separately, which lowers the amount for the relatively advantageous 10% and 12% brackets (before it jumps to 22%). From what I've read, it's still an option to continue using Married filing Jointly, but the non-US citizen spouse is then subject to US taxes? Need to double check on that one in case we want to withdraw more in a certain year.
https://www.goldinglawyers.com/form-i-4 ... ation-tax/
https://jp.usembassy.gov/ja/visas-ja/im ... r-i407-ja/