Should I file under FL if i live here all year, but never formally filed to be a resident? From OH, but never returned after separating from active duty.

[DawnC]

If you are no longer on active duty, then you no longer have a legal state of residence in OH.  If you reside in FL all of 2020, you are a Florida resident.   Have you had a residence in Florida, do you have a FL license?   Do you intend on going back to Ohio?  

[14near-korie-kr]

I do own a home in Fl. I do not have a FL license an do not plan on going back within the next few years.

[DawnC]

If you lived in FL all of 2020 and you intend of remaining there, you should claim FL residency.   You should have a FL license if you are not going back to OH anytime soon.  Also, if you are a registered voter, transfer that to FL, otherwise, OH may still think you are a resident and expect a tax return.