The CIT reform enacted by Law No.36 of 2008 cuts maximum tax rates from 30 per cent to 25 per cent and offers some incentives for business in Indonesia. This study aims at measuring the impacts of 2008 CIT reform on tax revenue and poverty. The 2008 CIT reform supported with the administrative reforms and the 2008 tax amnesty policy has increased new corporate tax payers by 422,407 and tax revenue by 53.95 per cent during 2009 to 2011. Further, the simulation result of CGE-Microsimulation shows that cutting the CIT rate from 30 per cent to 25 per cent will attract IDR 41.77 trillion of new investments, create 441,910 new job opportunities, boost 1.46 per cent of economic growth, decline 1 per cent of consumer price index, and raise averagely 1.5 per cent of wage rates. These macroeconomic changes contribute significantly to lift 1.88 million people (0.898 per cent) out of poverty.