Hi DDABM,
Thank you for asking. Yes, you may fill out all W-4's the same way with reduced the number of dependents you claim and/ or add an extra amount on W-4 line 4(c) to increase your withholding amount. If you think those withholding amount is still lower than expected, you may make estimated tax payment directly to IRS at https://www.irs.gov/payments
https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
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