"....the program broke...."? What program?
For tax year 2020? You cannot use the current online software for that. Online is only for 2021, and the results you would get for 2020 would be all wrong no matter what you do.
If you want to try preparing a 2020 return both ways--jointly and separately---you need the CD/download software for 2020 on a full PC or Mac.
And you have to follow all of the rules for MFS if you prepare separate returns. If one spouse itemizes, you both have to itemize, even if one of you does not have enough itemized deductions to exceed your standard deduction. Or you both have to use standard deduction.
You cannot get education credits or earned income credit if you file MFS.
If you have the desktop software for the right tax year you can also use the what if feature
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/compare-married-filing...
**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.**
