Due to the impact of globalization, large and fast site on the market, in market conditions where the competition wants to throw out the weaker companies from the market and take a better position, when every important business venture which the company can achieve, it is very important that the market provide accurate, objective and reliable financial - information basis. The audit is carried out so that market could receive all necessary and required information and the owners of capital could be confident in their business decision. The auditor is responsible for conducting audits, who after reviewing the existing situation, gives the company g its impartially, objectively and truthfully report. Although the audit could be conducted from the people of the company (internal audit ), more often to perform the audit is engaged a person outside the company ( external audit ) to be impartial, objective, professional and guided legal norms and rules. The beginning of the audit is associated with the development of market economy. The audit was first developed in the most developed countries of the world such as USA, Germany and Great Britain. What is the impact and importance of auditing in Croatia and other countries of the world show international auditing standards, various committees and institutes for implementation of the audit, which is increasingly wider and improved. How different countries ( USA, EU ) audit approach and how they implement it is more fully described in the work.