You can still amend a 2021 return. Again---if you and your spouse LIVE APART you may be able to amend/file as Head of Household. If you live together you should not be filing as HOH, and your spouse is all wrong to file as Single if you are legally married.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
