(1) The amount to be included in necessary expenses when calculating the amount of business income shall be the total amount of ordinary expenses generally accepted as expenses corresponding to the total income generated in the relevant taxable period. <Amended by Act No. 10408, Dec. 27, 2010>
(2) With regard to expenses corresponding to the total amount of income before the relevant taxable period and determined in such taxable period, only expenses not calculated as necessary expenses before such taxable period shall be deemed necessary expenses in such taxable period.
(3) Matters necessary for the calculation of necessary expenses shall be prescribed by Presidential Decree.[This Article Wholly Amended by Act No. 9897, Dec. 31, 2009]