refer to Form 1040 Line 38. If it is empty, IRS will calculate your penalty.
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Always print a copy of your completed tax return for your records, and review it carefully before e-Filing.
You will need it if you are audited by the IRS, to contact the IRS, or to amend if a TurboTax update changes your return or for any other reason,
AND, to find your AGI next year.