Hi there, @Kfasthoff.
I'm glad to see you joining the thread. Allow me to help share some insights about recording the cash paid to your employee with deducted taxes.
You don't have to change anything. The paycheck will automatically deduct the taxes so there's no need to change anything on your employee's details. Just ensure that the deducted taxes from the cash paid to your employee is the same as the taxes deducted in the system.
Let me know if you have other questions about recording the paycheck. I'd be glad to help you however I can.