Can I discontinue payroll service?

You can use the Search bar, at the top of any page here in the community, to find answers to most questions.  

In doing so, I found a thread that will walk you through what needs to be done to cancel your payroll subscription. 

https://quickbooks.intuit.com/learn-support/en-us/help-article/payroll-subscriptions/cancel-quickbooks-payroll-subscription/L3ad0cbFY_US_en_US#M6856