I'm happy to have you here on the Community forum, and it's my priority to help you delete a paycheck that is added to QuickBooks by accident.
To delete the paycheck, you need to open it, then perform the process from there.
Open your QuickBooks Online account, then click on Payroll at the left pane.
Tap on Employees, then go to the Paycheck list.
Select the paycheck from the list, then choose Delete.
You can also click on the paycheck itself, then choose the action needed from the tabs available.
Here's an article you can read more about deleting paychecks from QuickBooks: Delete or void paychecks.
Aside from that, you can also skim through the topics from this link for more hints about processing your payroll transactions: Help on common payroll topics.
If you need additional help with deleting a paycheck, please feel free to leave a comment below. I've got your back, and I'm always here to help. Keep safe always!
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