Hi there, 

The advice from MikeinBC is great. I'm glad you're looking into this further to make the proper adjustments to your sales tax. 

I recommend consulting with your accountant on this one. If they recommend that you complete a Sales Tax Adjustment in QuickBooks, here's how you can do that: https://quickbooks.intuit.com/community/Sales-tax/Process-sales-tax-adjustment/m-p/262010. 

If you need any additional help, please feel free to contact our Desktop phone support team at 877-772-9158. They're available 24/7, so you can call whenever it's convenient for you. 

If you have any other questions, please let me know. 

Cheers!