Good day, @ike-zagha.
If your employee requests an additional amount to be withheld from each paycheck, then you can enter an extra withholding for them.
Your employees must specify a filing status and their number of withholding allowances on Form W–4. They cannot specify only a dollar amount of withholding. For more info, you can check out this link: https://www.irs.gov/newsroom/tax-withholding-how-to-get-it-right
Here's how you can enter an additional amount for the Federal Income Tax:
- On the left panel, click Employees.
- Select the employee's name and click the pencil icon next to Pay.
- Under "What are employee's withholdings?", click the pencil icon to edit.
- In the Federal withholding section, enter the additional amount in the Extra withholding (Step 4c) section.
- Save.
Additionally, you can run some payroll reports in QuickBooks. This way, you can get a closer look at your business's finances and view useful information about your business and employees.
I'm just a reply away if you have other questions with the QuickBooks Online Payroll. Just add the details of your concerns in this thread and I'll help you out.