According to the Law, the ISS will be declared through a unified electronic system for the whole country by the 25th day of the month following the month in which the service is provided. This system must be developed by the taxpayers, individually or in collaboration, following layouts and standards set by the CGOA (Management Committee for Ancillary Obligations of the Tax on Services).
To find out more, talk to a lawyer you trust.
COMPLEMENTARY LAW No. 175, OF SEPTEMBER 23, 2020: