Where's my refund code 9001 meaning and how long does it does it stay on there

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What IRS Code 9001 Really Means

The actual code tells you exactly what it means – you filed a tax return that had multiple Social Security numbers attached to it. Typically, this is a husband and wife, but it could also include children as well (you never know, adult dependents may be checking the status of the refund). When you file your tax return, you have to specify a primary taxpayer, and the spouse or children all are secondary.

If you login to Where’s My Refund or on the IRS App and try to use the secondary Social Security number, you’re going to get this error message.