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Can I amend a 2021 "Married-Separate" tax return later at next filing year into a 2021 "Married-Joint" filing status and still get back the refund as if I filed it in 2021 as Joint?   There is just not enough time to get my spouse's papers together before the 2021 deadline in order to file Jointly.  So I will need to file Married-Separate but will take a $2255 hit vs  if filed Jointly.   I am a US citizen (no dependents) married in 2021 to a non-resident alien spouse who has no SSN or ITIN and who remains overseas for the foreseeable future.