Can I setup a income tax deduction rate for a single employee on QB payroll? A new employee recently joined already earned income and wants to be taxed at higher rate.

It's nice to have you here in the QuickBooks Community, @faik1234.

If you're referring to adding additional withholding to the employee, you can do that by editing their profile. This is the only way they can be taxed at a higher rate. The system calculate taxes based on the agency rates, and we don't have the option to increase that in QuickBooks.

To add additional withholding for an employee, follow the steps below:

1. Go to the Employees, and then select the employee you want to edit.
2. Select Edit ✎ next to Pay, or click Edit employee.
3. Click the pencil icon ✎ below What are [Employee's Name] tax withholdings?
4. Enter an amount in the Additional tax amounts that you want to deduct from each pay cheque field. 
   
5. Press Done after making the changes.

For additional reference, I'm leaving these related links below:

• Set up and add deductions and contributions to an employee's payroll
• Your Easy Guide to Payroll Deductions

Please come back here if you have other concerns with QuickBooks Payroll. I'll be right here to help you out.