I have the same question. The calculation seems wrong. TT is reducing my SE tax by the amount I'm allowed to defer (but have chosen not to). It then adds that to regular taxes after credits and is calling that 100% of my 2020 taxes. But actually, it is about $8000 low vs. the total tax shown on 1040 line 24.
TT reported the correct 2020 total tax number on the "Your estimated tax bill for 2021" screen, then 3 screens later on the "Which method?" screen, it tells me 100% of my actual 2020 taxes is $8000 lower than it actually is.
This is the kind of thing I expect TT to protect me from. I was logged into EFTPS to make my payments when I realized it just didn't seem like the right amount. Sure enough, it's $2000 per payment low. Please take a look at this and fix it please.
