Hi - please help me revise a payroll that has already been processed - thank you.

Glad to have you here on the Community page, @garethihiggins.

Paychecks that were already processed can't be edited or deleted in QuickBooks Online (QBO). If you wish to revise a payroll that has been processed, I encourage reaching out to our Support Team. This way, they'll be able to pull up your account securely and make the necessary action for your processed payroll. To contact support, tap on Contact us from the Help menu.

Also, consider checking these articles for additional reference about editing payroll in QBO:

• Edit a payroll paycheck
• Change an employee paycheck
• Edit payroll items used on paychecks

Tap on me if you have any other questions. I'm a few clicks away to help. Have a great weekend!