How do i add a one time non-cash taxable benefit to an employee at december 31 before i print the t4 slip

Hello bookkeeping34,

Glad to have you connect with us here. QuickBooks is a versatile program that enables you to streamline your accounting with ease. I'll be happy to provide more info so you can get back to doing what you love. 

Based on what you've described, I highly recommend you to check out the following community thread that provides more info about adding a non-cash taxable benefit. I also encourage you to check out this article here as it shows you how to: 

Set up and add deductions and contributions to an employee's payroll.

You're more than welcome to reach back to me here in case you have other questions. Otherwise, I wish you a great rest of the week!