There are many factors on how taxes are calculated for you paycheck. The tax will be based on the gross pay, filing status, dependents claimed, other jobs worked, other adjustments, and any disabilities claimed. All this information is needed to be able to determine net pay. He would need to discuss the W-4 changes with his company's HR department for assistance. TurboTax does provide a W-4 calculator to guide individuals with setting up their W-4. For more information on W-4s, see the link below:
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