QB Issue Resolution:

The Gross Amount column will show the total amount of all transactions (taxable or non-taxable). While the Taxable amount will display the total gross sales of taxable items.

Yes, you’re correct. The entry shown in the Non-Taxable Amount column is the difference between the gross and taxable amounts.

 

For more in-depth information about this feature, such the Accounting method, reports available used to track transactions, etc, check out this article: Automated Sales Tax.

Resolution for Issue 'NON TAXABLE AMOUNT on Sales Tax Liability Report' available: Yes (Solved).
Source: Intuit Community forum.

NON TAXABLE AMOUNT on Sales Tax Liability Report: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Automated Sales Tax
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Error Recovery for Automated Sales Tax [Canada]
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