This study aims to examine the effect of IOS to earnings management, either through the real activities manipulation and accrual activity manipulation in the Indonesia Stock Exchange. The sampling methods is by purposive sampling, with the criteria are companies that listed in Indonesia Stock Exchange and have complete research variable data 2008. We analyze with moderator regression analysis (MRA). This study find that there is the influence of IOS to earnings management, either through the real activities manipulation and accrual activity manipulation in the Indonesia Stock Exchange.