Hi there, kw5.
You can create a Journal Entry. Record both employee and employer's portion as payroll expenses. Then, separate them as sub-account.
You can use this hierarchy:
Parent account: Payroll Expenses Employee's portion.
sub-accounts: SS, Medicare, State tax and etc.
Parent Account: Payroll Expenses Employer's portion.
Sub-accounts: SS, Medicare, State tax, and etc.
Once done, split them based on the tax breakdown from 3rd-party that handles your payroll. Do this from your Banking page.
You can check this out these helpful articles:
You can also reach out to your accountant with regards to recording your payroll.
Feel free to visit again in the community. We're always here to help.