The purpose of this research is to know that the measure of company, the ratio ofprofitability, and the leverage effect simultaneously and partially, also to know the dominantvariables significantly to income smoothing action on the service companies listed on theIndonesia Stock Exchange. Based on calculations of index eckel, from the 42 companies thereare 8 companies that don't do the income smoothing, and 34 the rest do the income smoothing.Analysis tools used are analysis discriminant model z score. The results showed thatsimultaneous or partially 6 variables consist of the size of the company ( assets) , profit margin(PM ) , return on equity ( ROE ) , return on assets ( ROA ) , debt to equity ratio ( DER ) , anddebt to total assets ( DTAR ) had no significant difference between companies do incomesmoothing and not income smoothing. Simultaneously the variables used to predict the incomesmoothing can influence to only 9.24 %. Base on a model of the cut - off point , the discriminantfunction able to predict the company it will do the income smoothing.