The purpose of this article is to test if the change in the PIS / COFINS law, a consequence of 10.637/2002 and 10833/2003 laws, caused structural breaks in the Brazilian inflation dynamics, or even if it has any effect on the level of inflation. We concluded that for the price indexes - IGP and CPI -- there is no evidence of structural break on the inflation dynamics/level. The same is true for the sub-indexes of inflation, but the sub-index of Health Insurances which is the only exception.
