Hello schumachermr,
Thank you for participating in this Ask the Experts event. As to your question, it is most likely due to your income levels. Last year, the IRS has changed the way they withhold by issuing a new W-4 where it is no longer based on exemptions.
Being head of household with 3 dependents, your pay period income would need to reach a certain amount for your employer's payroll system to trigger federal withholding.
Either way, you should verify this with your employer.
