Hi there, rsmithn216.
There are a couple of tasks that you need to perform after migrating from Sage, including consolidating sales tax.
First, make sure that you have the correct CRA Business Number and filing frequency in QuickBooks Online. Here's how:
Second is cleaning up your sales tax. Sage 50 Accounting Sage uses 2 accounts (4 in Québec) to track Sales Tax and post migration steps to consolidate sales tax into the single GST/HST Payable account in QuickBooks are required.
To clean up GST/HST:
Lastly, enter a reverse journal entry to ensure your current balance is correct. Follow these steps:
Additional details about this are also discussed here: Post Conversion Checks For Getting Started With QuickBooks Online.
Let me know if you need anything else.