Hi there, Optimum. I'd be more than happy to help you with your W-4 not calculating its federal withholding.

Initially, you'll want to confirm you're using the latest version of QuickBooks and your payroll tax tables. This enables the system to calculate your taxes properly.

If the federal withholding continues not to calculate while everything's up-to-date, you can use your Verify Data utility to see if anything needs to be rebuilt.

Here's how:

1. Choose Window, then Close All.
2. In your top menu bar, go to File.
3. Click Utilities.
4. Select Verify Data.

After verification's complete, you'll see one of a few possible messages. I've listed each of them and their meanings below:

• "QuickBooks detected no problems with your data," - No action is required.
• "Your data has lost integrity," - This indicates that there's data damage in your company file. You'll want to perform a rebuild to correct the problem.
• An error message could display. If so, there might be an article about it. Try searching Intuit's QuickBooks Desktop support site for specific instructions.

In the event no problems were detected with your data, you can perform some additional troubleshooting with the QuickBooks Tool Hub.

If your federal withholding still isn't calculating, I'd recommend continuing to work with our Customer Care team. They'll be able to pull up the account in a secure environment, conduct further research, and create an investigation ticket if necessary.
 

They can be reached while using QuickBooks:

1. In your top menu bar, go to Help, then QuickBooks Desktop Help.
2. Click Contact Us.
   
3. Enter a brief description of the issue in our Ask a question (or tell us what's wrong) field.
   
4. Press Continue.
   
5. Select We’ll contact you for a callback or Message Us to start an instant messaging session.

Be sure to review their support hours so you'll know when agents are available.
 

If there's any questions, I'm just a post away. Have a wonderful day!