Hello sbbookingplus-gm,
Thanks for reaching out to us here. QuickBooks Online enables you to file and record sales tax payments seamlessly. When an overpayment occurs, the way it's recorded depends on how it was recorded on the CRA side of things, such as, if a refund was issued at that time for the over payment. I would be happy to provide more information, so you're on the right track with your sales tax goals!
QuickBooks also provides the option to enter sales tax adjustments, as you see necessary. However, with the date of the over payment, making any adjustments can have a negative impact on other areas of your books. For this reason, I encourage you to speak with an accounting professional, for their expertise and best course of action. If you don't have an accountant, you can search for a ProAdvisor in your local area by following this link.
If you have any other questions, feel free to reach back out. We would be glad to help!