The Self-Select PIN and the IP PIN are two different things, as you surmised. The Self-Select PIN acts as a kind of electronic signature when you file your return online using software such as TurboTax. The IP PIN is a number the IRS issues to taxpayers who have reported identity theft or who wish to use this special PIN to better protect their identity.
If you forgot last year's Self-Select signature ID, you'll need to provide your 2021 adjusted gross income (AGI) for verification purposes. See this help article for information on how to obtain your 2021 AGI.
See this help article for more information about the Self-Select signature ID.
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