How do I change the Unemployment tax rate retroactively after payroll checks have been printed?

Welcome to the Community, rue-myvalleyfurn.
 

You can change your employment tax rate in Payroll settings.
 

Here's how:

1. Use the Gear (⚙️) icon.
2. Go to Payroll settings.
3. Next to your state you want to update, click the Pencil (✏️) icon.
4. In your State Unemployment Insurance (SUI) Setup section, hit Change or add new rate.
5. Add the new Rate and be sure to enter your backdated effective date.
6. Select OK.

I've also included a detailed resource about working with unemployment which may come in handy moving forward: Update your SUI rate

Please feel welcome to send a reply if there's any questions. Have a great day!