You can avoid tax calculations at the service level when the invoiced charges for a service are equal to zero. The setting is not available to IDI platform users, and must be set by an authorized IDI associate by request. The setting is located in Admin Console>Business Rules>Taxes and is labeled Skip Service Perline Taxes If No Service Charges.
When this setting is enabled, during billing, the system will review each service to determine if there are billable charges. This includes non-recurring, recurring and usages charges. If there are no billable charges, the system will not invoice any perline taxes for that service.