Taxes owed can only be paid by the taxpayer, not by TurboTax.
If there was a calculation error in the TurboTax software then TurboTax would pay any penalties and interest assessed.
See this TurboTax support FAQ for the Accuracy Guarantee - https://ttlc.intuit.com/community/charges-and-fees/help/what-is-the-turbotax-100-accurate-calculatio...
However, in most all cases it is either an incorrect entry by the user of the software or an omission of taxable income by the user that would cause the IRS to assess more taxes owed.
What exactly does the IRS letter you received state for why the IRS changed your tax return? What is the IRS letter or notice number located in the upper right corner of the first page, usually preceded by either a CP or LTR?
