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Welcome to the Community, @practiceistrator.
Glad to have you here. Since you just ran payroll, you can cancel it by deleting all of the employee paychecks for this run. Here's how:
That's it! If you want to retain the incorrect checks for records, you can void them instead by following the steps here: Delete or void paychecks
Shoot me a reply if you have any other questions. I'm here as your number one resource for QuickBooks Online. Have a wonderful week!