Did you pay estimated tax ? Check the amounts/dates they have on your payments under your account at irs.gov lines up with what you put into TT. IRS recalculates the penalty based on information they have - any discrepancy in 2023 AGI/tax, estimated tax payments etc vs. TT may result in a different penalty calculation. If you are using TT desktop you can double click in Forms mode on 1040 line 38 then double click again on the worksheet to show the Form 2210 calculations used by TT in your filing.
