QB Issue Resolution:

So you are saying that avatax requires all items to set to taxable even if they are not?  That is very strange, and if so there is no setting in QB to omit that T from printing that I know of.  Have you talked to avatax about this?

Resolution for Issue 'Is there a way to not have the tax column print on invoices (the T next to the amount)?' available: Yes (Solved).
Source: Intuit Community forum.

Is there a way to not have the tax column print on invoices (the T next to the amount)?: 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.

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