Silvania Tognetti, Brazil, Pereira Neto, Galdino, Macedo Advogados ...

States War: ICMS
26 States have the power to enact their own ICMS law,
collect it, interpret it and judge the taxpayers defenses on
tax assessments.
Tax incentive on ICMS depends on approval of all States
(Confaz).
When the tax incentive is unilaterally enacted by a certain
State, the Supreme Court must review the constitutionality
of the State Law.
States decided to disregard tax credits on acquisition of
goods from a company that is entitled to a tax incentive in
one State that was not regularly approved by all States.