Hello Phoenix Custom Auto Designs,
Thanks for joining us in the Canadian QuickBooks community! This is a great question and knowing how the program is going to handle 2020's pay schedules is important for managing your books in the new year.
As QuickBooks Online's payroll modules pull information from CRA for things such as the payroll tax tables, the program intuitively knows what adjustments need to be made to keep your numbers accurate. There isn't anything you'll have to do on your end.
If come the new year you notice that there's a hiccup or you have concerns about the numbers you're seeing, feel free to get in touch with our support teams for clarification on what's happening. Here's how you can get in touch with QuickBooks Online support.
Phone and Chat: Click Contact Us to learn how to reach phone and chat support.
Schedule a Callback: click (?)Help in the upper right > click Contact Us > explain your situation > click Let's Talk > choose Get a callback (Note: Callback hours are the same as regular phone hours.)
Social Media: Facebook and Twitter from Monday to Friday between 9 a.m. and 8 p.m. ET
I hope that helps! Enjoy the weekend. :)