Hello, jlbelchera.
I'll share the steps to help you set up an employee to not hold federal and state withholding taxes.
In QuickBooks Online, you'll have the option to mark the employee as tax-exempt in the employee's profile. I'll show you how.
- Go to Payroll, then Employees.
- Select your employee.
- From Tax withholding, select Edit.
- Select the applicable Federal W-4 form if prompted.
- In the Federal Withholding Filing Status ▼ dropdown, select Exempt.

- Once done, hit Save.
For your reference, check out this article for a complete guide: Exempt your employee from Federal or State Withholding.
Additionally, I'd like to provide the following resources for future reference and help while processing payroll in QBO:
If there is anything else that you need, please let me know. We're always here to help you.