taxes missing on one check

Let me share some ideas on how to fix a paycheck that was cut and cashed already with no taxes taken out, @Donald14. 

Take note of the net checks distributed and create a duplicate check number for each and post each to Employee Advance. Then, add it as a payroll item if you do not have it already.

Here's how: 

1. Go to the Lists menu, then choose Payroll Item List.
2. Select the Payroll Item dropdown and click New.
3. Choose Custom Setup and click Next.
4. Select Deduction and choose Next.
5. Enter the name and click Next.
6. Fill in the necessary information, and choose the liability account and click Next.
   
   
7. Select the Tax tracking type, then click Next until you're in the Calculate based on quantity window.
8. Select Neither, then click Next.
9. Select whether to calculate on gross pay or net pay, then click Next.
10. Select Next until you can choose Finish.

 I've also added this link to help you edit a payroll item if ever you'll apply some changes. 

Once done, void issued payroll checks then, install the update. After, run payroll for correct taxing again and go into each check detail before saving and enter deduction from net to the employee advance item. Each new payroll check will be zero, but taxes will be correct. Next period when you run payroll you will deduct the remaining advance amounts from each employee.

In addition, let me attach these articles to help you understand tax calculations in QuickBooks Desktop:

• How QuickBooks calculates payroll taxes 
• Payroll items on a paycheck are not calculating or are calculating incorrectly

Please let me know how it goes. If you have any additional questions about the taxes calculation in QuickBooks, don't hesitate to leave a comment below. Have a good one.