A taxpayer of national tax subject to postponement of tax payment or payment in kind or to an extension of the due date for filing a tax return must pay interest tax together with that national tax, as provided for in the national tax laws.
The period that is the basis for the calculation of the amount of interest tax is not included in the period prescribed in Article 60, paragraph (2) (Delinquent Tax).
利子税の額の計算の基礎となる期間は、第六十条第二項（延滞税）に規定する期間に算入しない。
The provisions of Article 60, paragraph (4), Article 61, paragraph (2) (Special Provisions for Base Period for Calculation of Amount of Delinquent Tax), Article 62 (Calculation of Amount of Delinquent Tax in the Case of Partial Payment, etc.), and paragraphs (2) and (6) of the preceding Article apply mutatis mutandis to interest tax. In this case, the phrase "notwithstanding the provisions of the preceding paragraph, from the period prescribed in paragraph (2) of the preceding Article, the following periods (for national tax payable by filing a specified amended return or based on a specified reassessment and any other national tax specified by Cabinet Order, limited to the period listed in item (i))" in Article 61, paragraph (2) is deemed to be replaced with "from the period that is the basis for the calculation of the amount of interest tax, the period from the day following the day on which the tax amount payable by filing the return filed by the due date or the return filed after the due date was paid (if such day precedes the due date for filing referred to in Article 64, paragraph (1) (Interest Tax), that due date for filing) until the statutory tax return due date".
第六十条第四項、第六十一条第二項（延滞税の額の計算の基礎となる期間の特例）、第六十二条（一部納付が行われた場合の延滞税の額の計算等）並びに前条第二項及び第六項の規定は、利子税について準用する。この場合において、第六十一条第二項中「前項の規定にかかわらず、前条第二項に規定する期間から次に掲げる期間（特定修正申告書の提出又は特定更正により納付すべき国税その他の政令で定める国税にあつては、第一号に掲げる期間に限る。）」とあるのは、「利子税の額の計算の基礎となる期間から当該期限内申告書又は期限後申告書の提出により納付すべき税額の納付があつた日（その日が第六十四条第一項（利子税）の提出期限前である場合には、当該提出期限）の翌日から法定申告期限までの期間」と読み替えるものとする。