Let me first welcome you here in the Community, usertreasurer6.
I know a way on how to update an existing W-4 in QuickBooks Online.
Here's how:
- Go to the Payroll menu and then choose Employees.
- Select the name of the employee.
- Choose Edit ✎ beside Pay.
- Hit the 2020 W-4 or later radio button.
- Click on Update
- Enter the employee's W-4 information into the form.
- Select Done to save.
Once done, you can print a W-4 form from your QuickBooks Online account.
I've also added an article that'll help you learn more about the updated W-4 form: FAQs on the 2020 Form W-4.
In case you'll need assistance in dealing with payroll tasks, don't hesitate to get back on this thread. We're always here to help you.