It might be that your income is low enough that filing as head of household with two dependents you don't have to pay any tax. Use the Tax Withholding Estimator on the IRS web site to figure out what to put on your W-4 form. It will show you how to adjust your withholding to get the approximate refund amount that you want.
@anhelarroyo the W-4 is set to mimic the tax return. That means that if your income doesn't yield any tax liability on a tax return, then there is no withholdings on a pay check.
assuming both children are under 17 and you are filing HOH, then if your annual ncome is below $57,000, then your tax liability net of the tax credits for the children is zero. So if your total year income is less than $57,000, there is no need to withhold and your refund / amt due in April will be faily close to zero.
if you are paid 24 times a year and your gross income is $2400 per pay period that is quite close to the $57,000 I note above. Not surprised there is no withholding.
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