IRS Lock-In Dates
When the IRS detects an error in a person's withholding, they issue forms 2800C and 2801C to you and the person.
For further info, see the IRS website.
If you receive a form 2800C:
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Update the person's Tax Withholding card with the maximum withholding allowances specified by the letter.
Do this by the lock-in date.
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In IRS Lock-In Details on the card, enter this date in IRS Lock-In Date.