As said in former posts, during the preparatory phase all information from all jurisdictions involved should be analysed. However, it is not possible to implement all jurisdictions at the same time.
Moreover, and very unfortunate, the implementation phases are not indirect tax driven, indirect tax purposes are often not even considered in this respect.
This post can also be read as a manual in selecting the order of jurisdictions in your automation implementation.
Source: Isabelle Desmeytere on vattechnology.blogspot.com
