If an employee files an amended W-4, the employer must make the W-4 effective no later than the

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According to the IRS, the employer must make the W-4 effective no later than the start of the first payroll period ending on or after the 30th day from the W-4 receipt date. This gives the employer sufficient time to process the new withholding rate and ensure that the correct amount of taxes is withheld from the employee's wages.

If an Employee Files an Amended W-4, the Employer Must