Hello KatRom1987
Thank you for joining us today! We're so happy you are here! Changing your W-4 to 0 would inform the payroll department to withhold more federal withholding. If filling out W4, and you are single, you would only need to fill out the first section. You can also use the TurboTax tax caster to get an estimate for tax time and that should also let you know if you need to make any adjustments. Another thing to consider is if you had credits in prior years you may have not had this year, or pay increase. Here is the link for the TaxCaster: https://turbotax.intuit.com/tax-tools/
I hope this helps and can answer any other questions you might have.
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