Thanks for coming back, servalstudios.

I appreciate your time following the steps provided by Steve_C. The instructions will also help you move last year's data to the new class. I've got some sample screenshots below for reference.

For this screenshot I have the old class, which all paychecks are assigned to and the one I just created:

Next, I updated the class following the steps above and selected the Starting date. 

Finally, run a report for the new class by following these steps:

1. Go to the Gear > All Lists.
2. Select Classes.
3. Click the Run report link of the new class.
4. Choose the Report period and click Run report.

I'm also adding this article for more details: Payroll accounting preferences.

Please let me know if you need something else. I'll be around to help you some more.