Thanks for joining the thread, @Q_B Desktop User. Please allow me to share what I know with your concern.

Yes, you can consider the fees charged by Guideline to run the 401k plan as payroll expenses.

If you are unsure on how to use the account, you can refer to your preferred accountant. 

As always, if you have any additional questions related to QuickBooks. Let us know by leaving a comment down below. We got your back. Keep safe and Happy weekend!