If you did not have Form 2210 last year and no underpayment penalty, than you should enter $0 in the "prior year tax" field. If you had an underpayment penalty in 2024, you should enter that amount.
TurboTax calculates your underpayment penalty using Form 2210 based on your current year's information. If you don't file the form, the IRS will calculate it and send you a bill.
See also:
How to Avoid Penalties for Underpayment of Taxes
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