TurboTax does not calculate tax penalties as these are not a part of the tax return itself. The IRS does not have a specific form or process for calculating these along with your return, which is why TurboTax does not calculate this with your return. TurboTax will only calculate the original tax liability on the return.
If you are subject to failure to file or failure to pay penalties, the IRS will calculate these separately, including interest rates (which fluctuate quarterly), and will send you a notice detailing the penalty, as you have experienced.
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