QB Issue Resolution:

Sales tax shows up as the last detail line of the invoice. Subtotal appears wherever you type in a Subtotal item.

Resolution for Issue 'How do I add a Sub Total and sales Tax to the bottom of an Invoice?' available: Yes (Solved).
Source: Intuit Community forum.

How do I add a Sub Total and sales Tax to the bottom of an Invoice?: 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 Invoice
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