Legally, I am still married. I have no taxable income, only non-taxable spousal support. I understand I may not be required to file, but would it be advisable to file a zero-income return in my situation?
It depends on several items. Check out this article on our community that address when and why it might be beneficial to file.
https://community.freetaxusa.com/kb/articles/116-do-i-need-to-file-a-tax-return
