Great to see you here, bmk2938. I'll share some details about calculating taxes on the Payroll Summary report in QuickBooks Online (QBO).
In QBO, when you pull up the Payroll summary report, the Employee and Employer Taxes are automatically calculated. However, please refer to this article for more details: Understand how your payroll taxes are calculated. This link explains further the calculation of the taxes reported on your employees' paychecks and payroll forms in QuickBooks.
I've also added the following articles for future reference in managing taxes and reports in QBO:
I'll be around if you have any other queries with payroll taxes in QBO. Stay safe always!