Hi there, @CBPP.

Let me help and provide information about the Sales Tax Liability report that does not match your other reports in QuickBooks Online (QBO).

If your Sales Tax Liability report shows total sales that are different from the total income, you'll want to be aware that total sales and income won't always match because there are transactions that can appear in a data file which makes it unlikely for your Sales Tax Liability and Sales by Product/Service Summary reports to match.

To match your Sales Tax Liability report and Sales by Product/Service Summary, you have to click the total amount of sales by product/service summary and filter or tick the box of Taxable Amount and Tax Amount.

Here's how:

1. Go to Sales by Product/Service Summary report.
2. Click the TOTAL AMOUNT.
3. Filter the Report Period, and click the small Gear Icon beside the Export.
4. Click Show More.
5. Tick the box of Taxable, Taxable Amount, and Tax Amount.
6. Select Customize.
7. Click Run report.

I'll also add this article to guide you in customizing your reports to show specific accounts or customers, or format the layout so the right data shows up in the right place: Customize reports in QuickBooks Online.

Please feel free to drop a comment below, if you have further concerns about matching your reports or other QBO-related concerns. I will answer them in any possible way.