Hi there, @pipeman. 

Thank you for joining to the thread. 

W-4 is employee's withholding allowance certificate. The way you fill out this form determines how much tax your employer will withhold from your paycheck. You can follow the steps provided by Michael K above.  

Though, QuickBooks calculates the federal withholding based on these 4 factors:

• Number of allowances/dependents
• Taxable wages 
• Filing status 
• Pay frequency

 We'll need to verify the employee's details to make sure it set up accurate.

You can also read this article for more detailed and information about: Publication 15 (Circular E), Employer's Tax Guide. 

Please get back to me if you have further concerns about Taxes. I'm here to lend you a hand. Have a great day!