How to file back taxes and married filing separately?

[kklondon2013-gma]

Haven't filed since 2016, what is the process to get caught up?

[DoninGA]

Your best option is to find a local tax professional in your area to assist you in completing all of those tax returns.  You will especially need their assistance if you have back taxes owed from the returns.

Any tax refund has been forfeited on tax returns for tax years prior to 2020.