I'd like to explain how payroll works in QuickBooks Online UK, karen.

For now, we're unable to turn off the payroll functionality. To get rid of any payroll charges, you'll have to stop running payroll or creating any paychecks.

I know turning off this feature is convenient for you to make sure you'll not acquire any charges at all. I'll forward your concern to our higher management so they can help us submit it to our product developers. This will be assessed and might be included in future updates. 

Please know we're right here if you need help from us.