Thank you for joining the thread, @thomas3762.

We provide solutions based on the product tagged by a user regarding their concerns or issues. Since the original poster tagged it as QuickBooks Online (QBO), my colleagues above focus on giving information to the specific product only. But don't worry, I'm here to help assign a class to your employee's paycheck in QuickBooks Desktop (QBDT).

First off, you'll want to turn on the class tracking feature in QBDT. Here's how:

1. Open your QuickBooks Desktop company file.
2. Go to the Edit menu, then select Preferences.
3. Click Accounting from the left menu and go to the Company Preferences tab.
4. Select Use class tracking. Then, click OK.

Once done, you can now assign a class to your employee's paycheck by going to the Payroll & Employees preferences. Let me guide you on how:

1. Go back to the Preferences menu, then select Payroll & Employees. Be sure that Full payroll is selected in the QuickBooks Payroll Features section.
2. Select Job Costing, Class, and Item tracking for paycheck expenses.
3. If you want to assign one class to an entire paycheck, select Entire paycheck.
4. If you want to assign one class to each item on the paycheck, choose Earnings item.
5. Click Ok.

I'm adding this article for more guidance: Tracking payroll expenses by class, department, or location.

That's it! Come back to this post and let me know how it goes, @thomas3762. I want to make sure you're taken care of.

Additionally, I want to add this article that'll help you pay or file your payroll taxes online: E-File and E-Pay in QuickBooks Desktop.

Have a good one.