877-850-2832. Visit: California Tax Education Council.
If you file Form 941 and make a mistake on tax withholding, file Form 941-X, Adjusted Employer's Quarterly Federal Tax Return or Claim for Refund. You can either use this form to report overreporting and underreporting and pursue the adjustment process, or you can claim a refund from the IRS.
Contact Your Employer's Payroll Department: Reach out to your HR or payroll department to explain the situation. They may be able to correct the withholding on their end and issue a refund for the incorrectly withheld taxes.
If the amount under/over withheld is deemed too excessive, the IRS can send a lock-in letter notifying the employer how to adjust withholding regardless of the employee's W4 requests. If a W-4 error is caught before filing, individuals can correct this relatively easily by refiling a W-4 with their employer.
You should inform your employees of the importance of submitting an accurate Form W-4. An employee may be subject to a $500 penalty if the employee submits, with no reasonable basis, a Form W-4 that results in less tax being withheld than is required.
First, I recommend reaching out to your employer's human resources or payroll department immediately. Inform them about the error in your W-4 form and the subsequent over-withholding of federal taxes. They should be able to assist you in rectifying the situation.