I am a US citizen and have been married to a foreign spouse since 2018. I found out in January of this year that I could include her on my taxes and file as MARRIED FILING JOINTLY. I included her income on our tax return as well. This is my first year to apply for her to get an ITIN. Can I amend my tax filings from the last 3 previous years once I receive my Her ITIN ? I've filed married filing separately before , I never knew of the huge tax break. I have her pay statements for the last 3 years as well.
