A taxpayer must pay delinquent tax if any of the following items applies:
納税者は、次の各号のいずれかに該当するときは、延滞税を納付しなければならない。
where the taxpayer has filed a return by the due date but does not pay in full the national tax payable by filing that return by its statutory payment due date;
where the taxpayer has filed a return filed after the due date or an amended return, or has received a reassessment or a determination under the provisions of Article 25 (Determination), and there is any national tax payable under the provisions of Article 35, paragraph (2) (Payment of National Tax using the Self-Assessment System);
where the taxpayer has received a notice of tax payment and pays the national tax payable under that notice (excluding the national tax prescribed in item (v), penalty tax for failure to pay, heavy penalty tax and negligence tax) after its statutory payment due date;
where the taxpayer does not pay in full the income tax subject to estimated tax prepayment by its statutory payment due date; or
予定納税に係る所得税をその法定納期限までに完納しないとき。
where the taxpayer does not pay in full the national withholding tax by its statutory payment due date.
源泉徴収等による国税をその法定納期限までに完納しないとき。
The amount of delinquent tax is to be the amount calculated by multiplying the unpaid tax amount by the rate of 14.6% per annum, according to the number of days in the period from the day following the statutory payment due date of the national tax prescribed in each item of the preceding paragraph (for a national tax that has become payable because the amount refunded by carryback of net loss, etc. was excessive, consumption tax, etc. on goods taken from a bonded area with permission for import (excluding petroleum and coal tax payable under the provisions of Article 17, paragraph (3) (Payment, etc. of Petroleum and Coal Tax on Crude Oil, etc. Received) of the Petroleum and Coal Tax Act), and other national taxes specified by Cabinet Order, the day specified by Cabinet Order; the same applies in paragraph (2), item (i) of the following Article) until the day on which that national tax is paid in full; provided, however, that for the period until the due date for payment (if permission for postponement of tax payment or for payment in kind has been revoked, the day on which the document concerning that revocation was issued; the same applies hereinafter in this paragraph and in Article 63, paragraphs (1), (4) and (5) (Exemption from Delinquent Tax in the Case of Tax Payment Grace Period, etc.)) or for the period until the day on which two months have elapsed from the day following the due date for payment, the amount of delinquent tax is to be the amount calculated by multiplying the unpaid tax amount by the rate of 7.3% per annum.
延滞税の額は、前項各号に規定する国税の法定納期限（純損失の繰戻し等による還付金額が過大であつたことにより納付すべきこととなつた国税、輸入の許可を受けて保税地域から引き取られる物品に対する消費税等（石油石炭税法第十七条第三項（引取りに係る原油等についての石油石炭税の納付等）の規定により納付すべき石油石炭税を除く。）その他政令で定める国税については、政令で定める日。次条第二項第一号において同じ。）の翌日からその国税を完納する日までの期間の日数に応じ、その未納の税額に年十四・六パーセントの割合を乗じて計算した額とする。ただし、納期限（延納又は物納の許可の取消しがあつた場合には、その取消しに係る書面が発せられた日。以下この項並びに第六十三条第一項、第四項及び第五項（納税の猶予等の場合の延滞税の免除）において同じ。）までの期間又は納期限の翌日から二月を経過する日までの期間については、その未納の税額に年七・三パーセントの割合を乗じて計算した額とする。
The taxpayer referred to in paragraph (1) must pay delinquent tax together with the national tax that is the basis for the calculation of its amount.
Delinquent tax is to be national tax falling under the tax item which applies to the tax amount that is the basis for the calculation of its amount.
延滞税は、その額の計算の基礎となる税額の属する税目の国税とする。