Penality / Interest

TurboTax does not assess penalties; the IRS and state tax authorities assess penalties. Are you referring to an underpayment penalty on your balance due? 

According to the IRS:

Generally, most taxpayers will avoid this penalty if they either owe less than $1,000 in tax after subtracting their withholding and refundable credits, or if they paid withholding and estimated tax of at least 90% of the tax for the current year or 100% of the tax shown on the return for the prior year, whichever is smaller. 

the IRS does not assess interest on an underpayment of tax penalty unless the entire balance due, if any, isn't paid by 7/15/2020.   if you had a stare return, that might have been due at an earlier date. Not all states extended the due date to 7/15.  so now if you owe you have penalties and interest on the late payment.