Final Project is purposed to know the calculation of Corporate Income Tax at Employees Cooperative "Cipta Sejahtera" PDAM Semarang in 2014 and to know the calculation of Corporate Income Tax by Employees Cooperative "Cipta Sejahtera" PDAM Semarang have appropriate with Income Tax Regulation Number 36 in 2008. The collecting data used in this final project were primary data and secondary data, and writing method used is a desciptive method and exposition method. Calculation of corporate income tax conducted by the Cooperative has is still less true in fiscal income, causing the results of the calculation of income tax payable at Employees Cooperative “Cipta Sejahtera” PDAM Semarang by the Cooperative is Rp 138.944.246,00. This is because there are some things in the fiscal correction is not conforming to the Income Tax Regulation Number 36 in 2008, including depreciation expense. Calculation of depreciation conducted by the Cooperative, still using the same depreciation rate with depreciation rate by the policy of Cooperative. Thus, the calculation result to difference and the fiscal correction must be made. Meanwhile, the result of the calculation of the corporate income tax payable by calculation of writer is conforming to the Income Tax Regulation Number 36 in 2008 is Rp 129.443.855,40.