I need to have extra tax taken off each payroll requested the employee. How do I enter this in desktop?

Hello RTM83054,

Thanks for reaching out to us here. I can see the importance of being able to edit your employee's taxes in QuickBooks Desktop. Rest assured, I'll be glad to steer you in the right direction. 

To get started, it's important to note that QBO adheres to tax regulations set by the CRA. That said, you can edit the employee's TD1 tax information using the following steps:

1. Go to Payroll and select Employees.
2. Select your employee.
3. From Tax withholding section, select Edit.
4. In the Federal withholding section, fill in the applicable info from your employee’s TD-1.
5. Select Save.

Here's an article that provides in-depth info related to this topic. Let me know if this info helps. I'll be a message away in case you have other questions.