①A taxpayer of a national tax subject to the official assessment system must, as provided for in the national tax laws, file a return stating the tax basis of the national tax with the district director of the tax office by the due date for filing it.

②The provisions of Article 21, paragraph (1) (Place for Filing Tax Returns) and Article 22 (Time of Filing of Tax Returns, etc. Sent by Mail, etc.) apply mutatis mutandis to the return referred to in the preceding paragraph (hereinafter referred to as a "tax basis return").