You are reviewing the line amount of a transaction and the taxable column is populated but there is no tax rate. The tax rate is 0%.
If the invoice Destination Address is in a jurisdiction in which you do not have nexus or are collecting Use tax, the rate will be 0% and the taxing jurisdiction will be based on the origin address.
Without Nexus enabled or when using the Sales or Sellers Use Tax Tax Type, the jurisdictions revert to the origin jurisdictions with 0% rate
If the destination address is in a jurisdiction in which you have nexus, tax will charge properly and the taxing jurisdiction will display a tax rate
For more information, see Add Nexus Jurisdictions