How can I still owe if I claim "0" on my W4?

It’s a common misconception that claiming “0” on your W4 ensures the maximum amount is being withheld from your paycheck for taxes.
 
Those who have multiple jobs, high income, no deductions, and/or no children will often find that claiming “0” is not enough. These folks actually have to claim “0” and also elect to have an additional amount withheld from each paycheck (using line 6 of the W4 withholding form).
 
Click here for more info on ensuring accurate pay withholdings.
 
You can also find the IRS & CA interactive Withholdings Calculators.

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