As part of the Common Law, IFRS represents a significant cultural change in Brazil, a Civil Law country, for both accounting and law. In 2010 (the first adoption of IFRS), Brazilian accounting legislation fully adopted the International Financial Reporting Standards (IFRS) as its standard for accounting practices. Accordingly, its adoption by Brazil represents a challenge, since it is a significant cultural change, because of its insertion into a Civil Law system country. First of all, in accounting terms, this chapter comments how the specific rules were changed by principles with a big importance for the administration judgments, in this way, the managers' subjectivity. Additionally, considering that in a Civil Law system, especially in Brazil, this chapter presents that there are many shareholders' rights in the stricto sensu law, the legal impacts of the financial statements must be analyzed, including the manager's responsibility.