Interim corporate income tax return filing by August 31, 2015


A resident corporation (and a nonresident corporation having a permanent establishment in Korea) is required to pay interim corporate taxes within 2 months from the end of the first six months of each fiscal year. An Interim corporate tax return must also be filed along with the tax payment. A corporation with a fiscal year the same as calendar year must file the interim corporate tax return no later than August 31, 2015.



The interim corporate income tax return can be filed using either (i) the 1/2 method (that is, paying 1/2 of the corporate tax paid in the prior year or (ii) the book-closing method (by closing the books of accounts of the corporation for the first six-month period and calculate interim corporate tax amount based on such six-month financial results). When a corporation had not paid the corporate income taxes in the prior year due to tax loss or having no taxable income, only the option (ii) above should be applied. The calculation formula of interim corporate taxes by using the book-closing method is as follows:



Taxes payable = [taxable income for interim period Ⅹ12/6]Ⅹtax ratesⅩ6/12


               - (tax exemption/withholding taxes paid and taxes assessed for the


               interim period)



If the interim corporate income taxes payable exceeds Won 10 million, such taxes can be paid in 2 installments as below. The second installment payment is due within 1 month from the end of the filing due date (2 months in the case of defined small and medium corporation).



If total taxes payable is:


Installment payments can be

broken down as below:

Over Won 10 million

~ up to 20 million


10 million


Excess over 10 million

Over Won 20 million



50% or more of taxes payable


Remaining 50% balance



 1st installment is due within 2 months from the end of the first 6 months of each

  fiscal year (i.e., August 31 for calendar fiscal year)

 2nd installment is due within 1 month from the end of the filing due date

  (i.e., September 30)


Unlike annual corporate income tax return, there is no additional local income tax payable on interim corporate income tax liability.