Income Tax Act Article 14-7
When an individual fails to file the tax return within the period as specified in Article 14-5, the tax authority may assess the amount of income and tax payable and issue to the individual a written notice, demanding the payment of tax within the time limit.For implementation of the investigation and verification by the tax authority after receiving a tax return filed by an individual in accordance with Article 14-5, the provisions of Paragraph 1 of Article 80 shall apply mutatis mutandis.For serving, checking and correction of the assessment notice showing the result of further investigation in accordance with the preceding Paragraph, Article 81 shall apply mutatis mutandis.For an individual who has refundable tax payment through the investigation and verification in accordance with Paragraph 2, Paragraphs 2 and 4 of Article 100 shall apply mutatis mutandis.For an individual who declares the deductions of various kinds of costs, expenses, and losses which exceed the limitations prescribed by Article 14-4 and the preceding Article, and thus the voluntary payment of tax falls short, Article 100-2 shall apply mutatis mutandis.