How can I make an employee into a contractor and void their checks?

You've reached the right support, kbjoyllc.

Before changing an employee to a contractor, you'll need to change it's status to Terminated.

Here's how to do this:

1. Go to the Workers menu.
2. Choose Employees tab.
3. Find the employee to be terminated. Click the employee's current status.
   
4. Choose the Employment section.
5. elect Terminated from the Status drop-down list.
6. Click Save.
   

Then, you can start setting it up as a contractor. Here's how:

1. Go to Expenses tab and choose Vendors.
2. Click New vendor.
3. Fill in the necessary information and click Save.

For additional insights about transitioning an employee to a contractor, here's a good reference for you: Change Employee To Contractor Or Contractor To Employee.

On the other note, the steps on how to void a check depends on which payroll subscription. Learn more about voiding checks in QuickBooks Online through this article.

However, I'd still suggest reaching out to your accountant for more expert advise about this.

You can always go back to this thread if you have other questions. It's my pleasure to help in any way I can. Have a good one.