| By knowing an information, then we can set a strategy to plan something, likewise earning informativeness. The informations contained earnings are a reflection of firm’s performance, so that many investors want it. However, not all of the nformations contained earnings are correct, many of them are misleading or deliberately misled, one of the ways is income smoothing. Several factors can affect income smoothing, like effectivity of audit committee, proportion of independendent commissioner boards, investor protection, managerial ownership, and institutional ownership, but all of these factors can also affect earning informativeness. The object of this research is non-financial companies that listed in Indonesia Stock Exchange in 2009-2015. The first model has a total 247 samples and for the second one has total 189 samples. Testing of the earning informativeness proxied by Earning Response Coefficient (ERC) and the result shows only investor protection has significant correlation on earning nformativeness. While testing of income smoothing proxied by Eckel’s Index and the result shows proportion of independent boards commissioner and institutional ownership has positive correlation on income smoothing, meanwhile investor protection and managerial ownership has negative correlation with income smoothing. |