Most definitely Tax Jurisdictions would be used. That means, you have to pick either TAXUSX or TAXUSJ. TAXUSX is used when the company is going to use an external tax software such as Vertex. If they are going to use SAP for tax accounting, then tax procedure TAXUSJ will be used.
Before you go ahead with the configuration, you should ask this question to your client if this is a new implementation.
Regards,
MG