After calculating tax on a billing, the header level of the bill does not show tax. This also happens when we try to print or create an invoice with the leader invoice .
This issue was fixed in version 2.76 of the connector for AccountingSeed for Avalara AvaTax.
To resolve this issue, we have provided a field named 'Sales Tax,' which will reflect the taxable amount at header level.
Just fetch this field from Billing Layout and move it onto the Billing transaction.