@pk @DoninGA @TomD8 @Anonymous_ Thanks all.
I saw below details about "Married Filing Jointly with a nonresident alien spouse" :
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/file-taxes-spouse...
If this is the first year that you’ll file jointly with your spouse, you’ll need to tell the IRS that you’re electing to both be treated as U.S. residents for tax purposes. This election is permanent unless it’s suspended or revoked. Once revoked, the nonresident alien can’t elect to be treated as a resident in the future, even if married to someone else.
A quick question about the bold sentence above. What happens when a nonresident alien later becomes a US national(Citizen/GreenCard) either thru the current US spouse or another marriage with someone else, does it mean this US person will be treated as a nonresident alien for tax purposes for the rest of their life ?
