This study comparatively analyzed the degree of earnings management through revenue management between the service industries and the wholesale/retail and manufacturing industries using a discretionary revenue model. The analysis showed that the degree of earnings management using sales revenue adjustment and deferred revenue adjustment as discretionary income was stronger in the service industries than in the wholesale/retail and manufacturing industries. Since most service industries provide services, the revenue recognition process is relatively complex, and there are many cases where estimation of amounts is required, resulting in a larger degree of reporting earnings management compared to other industries. Additionally, as a result of analyzing the direction of discretionary revenue adjustment according to income level, it was found that surplus companies among wholesale/retail and manufacturing industries use discretionary sales revenue for upward adjustment of reported income. In contrast, service industries in the red companies appear to be using discretionary deferred revenue in raising reported income to reduce deficit.