If you need to retrieve your IP PIN from the IRS to use on your tax return, you can check your account and retrieve the number by using the Get an IP PIN.
If you need help with this, check the IRS site for more information.
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If you mean the IP PIN for identity protection, you lost or never got your CP01A letter, retrieve your IP PIN online at the IRS's Get an IP PIN website. Scroll to the bottom to retrieve.