did you enter your prior year tax.
Illinois works differently than federal
the required total payments are the lesser of 100% of your 2020 tax or 90% of your 2021 tax
1/4 must be paid in each quarter
so based on 2021 taxes being higher than 2020. 1/4 of your 2020 taxes need to be paid in each quarter.
if you had withholding Turbotax automatically allocated 1/4 to each quarter regardless of the amount actually withheld each quarter.
you can override this on the form line 10a if your withholding varied from quarter to quarter.
note. that when I this some years ago Illinois disallowed the specific allocation. I had to actually send it paystubs that showed the withholding I was claiming. I did prevail in the end.
then you have to look at penalty w/s 1 for the calculations. Turbotax as far as I can see uses the actual estimated tax payments each quarter based on the entries in the tax payment worksheet.
so what's occurring in your version of TT is different than what occurs in my desktop version as far as the estimated tax payments credited to each quarter.
no one except a Turbotax agent can review your return to see what is happening.
