Tax on Remote work

In Japan on a Spouse Visa, full remote work for a US company, paid in USD to US bank account. Nonpermanent tax resident, with only my income to consider (120k USD)

First year filing, searched through various posts and believe I understand the filing process.

1) Despite income being remote, it is considered “Japan-sourced” as it was performed while physically living here.

Wife is adamant that this is not the case and said she confirmed via local tax office that I only have to count the amount actually remitted/used to live in Japan. Want to believe her (because that’s a ton less owed on our end, but also want to make sure I don’t do anything wrong)

Can you help me put this to rest.

// when converting salary to Yen for tax purposes, I should be using the TTM rate as of the date of the paycheck or will I be fine using the NTA annual average?

by The_Cyrinishad