FreeFillableForms is great and has saved me a ton of time, but it does not do the calculations automatically for every field. You still have to manually lookup certain things from tables. It's freakin' frustrating, because there's no reason why it couldn't automate those as well.
Even more frustrating because it doesn't tell you that you haven't done the calculation or worse, you haven't transferred a field from one form to another.
I failed to copy my self-employment tax back to my 1040 for 2020, despite having calculated it correctly. No warnings, the form filing went smoothly, and 4 months later I got a notice from the IRS.
