You would need to contact the IRS or request an account transcript from the IRS in order to know how much is owed.
That would not be listed anywhere within TurboTax or your prior returns. If the funds owed consisted of a prior year balance due and it remains unpaid, there will be additional penalties and interest added to the total.
In addition to the resources provided by Champion DoninGA, you can use the following link to request a tax account transcript from the IRS:
Get Your Tax Record
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