Yes, if you have been issued an IP PIN by the IRS, then you do need to enter it on your mailed tax return. The place to put it is in the signature area of the Form 1040. See the following information from the IRS to learn more:
Where do I enter the IP PIN on my tax return?
Also, the following TurboTax help article will tell you how to get your IP PIN for the current tax year. You do need to get one from the IRS every year.
How do I get my 6-digit IP PIN?
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