If you want users of FinancialForceBilling Central to calculate tax for billing documents using an external tax service such as Avalara AvaTax, you must provide the following information on the ERP Tax Calculation Settings page:
To test the connection with Avalara AvaTax, click Test Connection.
We suggest you select the Disable Commit checkbox to prevent data being sent to Avalara while testing the connection.
Select Enable External Tax Calculation, then click Save.