First time participating on this thread:

We have the same problem. My colleague was using the Sales Tax Liability Report for our first few state filings (Indiana) when I realized our Gross Sales amounts were wrong. We had to go back and amend all of our filings. I concur with the thread that the "Gross Amount" column appears to be only reporting the total of the transactions that have taxable line items; it is not the total gross sales which would include non-taxable plus taxable line items. Thus, the "Non-Taxable Amount" column in all of our reports always shows zero for a value.

We have struggled to find an easy way to look at the non-taxable amounts together with the taxable amounts due to this problem.

One thought for Intuit coming from a novice: could it be that this report is only looking at the "product" line in order to filter the results? It seems that many of the support posts go back to changing product-level meta-data to correct this. All of our products are "taxable" so changing this flag at the product level doesn't seem like the right solution for us. We get into "non-taxable" transactions when we are shipping items to other states in our online store. It seems like the product type should not be the determinant for this report. Shouldn't the report filter be looking at the taxable amounts at the transaction level instead?