Why are my Tax Group Codes not being set on lines in Business Central

In BC we follow the default setup.

If you import invoices into BC from Fidesic and do not see the Tax Group Code being set on the line level, this is due to a BC Configuration. Fidesic will follow this configuration at the time of import. 

BC Configuration

Within BC's universal search, search for Chart of Accounts

You can then set this Tax Group Code per GL