I have a question regarding IRS IP PINs and timing. The notice instructs the taxpayer to go online and obtain an IP PIN, but in this situation the return has already been filed using that Social Security number.

How does obtaining an IP PIN now apply for the current filing season if the return has already been accepted? My understanding was that IP PINs are preventative and apply to future filings rather than retroactively.

For those of you who have encountered this scenario, have you seen cases where a taxpayer obtained an IP PIN after filing and it still had an impact for the current year? Or is this strictly something that will only apply going forward?

Appreciate any insight or real-world experience on this