The law as Act on the Arrangement, etc. of Related Acts upon the Enforcement of the Act on Security Assignment Contracts and Retention of Title Contracts (Act No. 57 of 2025) leaves it, with the words it changes marked.
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Article 66第六十六条
Penalty Tax for Failure to File(無申告加算税)
Article 66, paragraph (1)
In any of the cases listed in the following items, penalty tax for failure to file is imposed on the taxpayer in an amount equivalent to the amount calculated by multiplying the tax amount payable under the provisions of Article 35, paragraph (2) (Payment of National Tax using the Self-Assessment System) based on the return, reassessment or determination prescribed in the relevant item by 15% (or by 10% if the return filed after the due date or the amended return referred to in item (ii) was not filed in anticipation that a reassessment or determination would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax); provided, however, that this does not apply if there is found to be a justifiable reason for the failure to file a return by the due date:
where a return filed after the due date has been filed or a determination has been made under the provisions of Article 25 (Determination); or
期限後申告書の提出又は第二十五条(決定)の規定による決定があつた場合
Article 66, paragraph (1), item (ii)
where, after a return filed after the due date has been filed or a determination has been made under the provisions of Article 25, an amended return has been filed or a reassessment has been made.
期限後申告書の提出又は第二十五条の規定による決定があつた後に修正申告書の提出又は更正があつた場合
Article 66, paragraph (2)
In the case falling under the provisions of the preceding paragraph (excluding where the proviso to that paragraph or paragraph (9) applies; the same applies in the following paragraph and paragraph (6)), if the payable tax amount prescribed in the preceding paragraph (if an amended return referred to in item (ii) of that paragraph has been filed or a reassessment has been made, the amount obtained by adding the cumulative paid tax amount for that national tax; referred to as the "cumulative paid tax amount after addition" in the following paragraph) exceeds 500,000 yen, the amount of penalty tax for failure to file referred to in the preceding paragraph is, notwithstanding the provisions of that paragraph, to be the amount obtained by adding, to the amount calculated under the provisions of that paragraph, the amount calculated by multiplying the tax amount equivalent to the excess portion (if the payable tax amount prescribed in that paragraph is less than the tax amount equivalent to that excess portion, that payable tax amount) by 5%.
In the case falling under the provisions of paragraph (1), if the cumulative paid tax amount after addition (if, among the facts that formed the basis for the calculation of the cumulative paid tax amount after addition, there are facts for which the taxpayer is found not to be responsible for their not having been taken as a basis for the calculation of the tax amount before the return, reassessment or determination prescribed in the items of that paragraph (including the tax amount equivalent to the amount of a refund), the tax amount obtained by deducting the amount calculated, as provided for by Cabinet Order, as the tax amount based on those facts) exceeds 3,000,000 yen, the amount of penalty tax for failure to file referred to in that paragraph is, notwithstanding the provisions of the preceding two paragraphs, to be the amount obtained by deducting, from the total of the amounts calculated by dividing the cumulative paid tax amount after addition into the tax amounts listed in the following items and multiplying each of those tax amounts by the rate specified in the relevant item (if the return filed after the due date or the amended return referred to in paragraph (1), item (ii) was not filed in anticipation that a reassessment or determination would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax, the rate obtained by subtracting 5% from that rate; the same applies hereinafter in this paragraph), the total of the amounts calculated by dividing the cumulative paid tax amount into the tax amounts listed in the following items and multiplying each of those tax amounts by the rate specified in the relevant item:
the tax amount equivalent to the portion of 500,000 yen or less: 15%;
五十万円以下の部分に相当する税額 百分の十五の割合
Article 66, paragraph (3), item (ii)
the tax amount equivalent to the portion exceeding 500,000 yen but not exceeding 3,000,000 yen: 20%; and
五十万円を超え三百万円以下の部分に相当する税額 百分の二十の割合
Article 66, paragraph (3), item (iii)
the tax amount equivalent to the portion exceeding 3,000,000 yen: 30%.
三百万円を超える部分に相当する税額 百分の三十の割合
Article 66, paragraph (4)
In the preceding two paragraphs, "cumulative paid tax amount" means the total of the following tax amounts payable with regard to that national tax that arose before the filing of the amended return or the reassessment referred to in paragraph (1), item (ii) (if, with regard to that national tax, there has been a reassessment that reduces that payable tax amount or a change to the original disposition through a decision, determination or judgment on an appeal against or action for a reassessment or a determination under the provisions of Article 25, the amount obtained by deducting the amount equivalent to the tax amount of the portion reduced thereby, and if the provisions of paragraph (5) of the preceding Article (limited to the part concerning item (i); the same applies hereinafter in this paragraph and in paragraph (7)) as applied mutatis mutandis pursuant to paragraph (7) have been applied, the amount obtained by deducting the amount that should have been deducted under the provisions of paragraph (5) of that Article):
the tax amount payable under the provisions of Article 35, paragraph (2) based on the filing of a return filed after the due date or a determination under the provisions of Article 25; and
期限後申告書の提出又は第二十五条の規定による決定に基づき第三十五条第二項の規定により納付すべき税額
Article 66, paragraph (4), item (ii)
the tax amount payable under the provisions of Article 35, paragraph (2) based on the filing of an amended return or a reassessment.
修正申告書の提出又は更正に基づき第三十五条第二項の規定により納付すべき税額
Article 66, paragraph (5)
In the case falling under the provisions of paragraph (1), if, before the return filed after the due date or the amended return was filed or the reassessment or determination was made (hereinafter referred to as a "return filed after the due date, etc." in this paragraph) with regard to matters to be entered or recorded in the books, the taxpayer was requested by the relevant official to present or submit those books, and the case falls under any of the following cases (excluding where the taxpayer is not responsible), the amount of penalty tax for failure to file referred to in paragraph (1) is, notwithstanding the provisions of paragraphs (1) through (3), to be the amount obtained by adding, to the amount calculated under those provisions, the amount calculated by multiplying the payable tax amount prescribed in paragraph (1) (if there are facts that are to form the basis for the calculation of that tax amount other than those relating to matters to be entered or recorded in the books that are the cause of the return filed after the due date, etc. (hereinafter referred to as "facts other than those relating to matters to be recorded in the books" in this paragraph), the tax amount obtained by deducting the amount calculated, as provided for by Cabinet Order, as the tax amount based on the facts other than those relating to matters to be recorded in the books) by 10% (or by 5% if the case falls under the case listed in item (ii)):
where the taxpayer did not present or submit the books to the relevant official, or where the entry or record of specified matters, among the matters to be entered or recorded in the books presented or submitted to the relevant official, is extremely insufficient, as specified by Ministry of Finance Order; or
where the entry or record of specified matters, among the matters to be entered or recorded in the books presented or submitted to the relevant official, is insufficient, as specified by Ministry of Finance Order (excluding the case listed in the preceding item).
In the case falling under the provisions of paragraph (1), if any of the following items applies, the amount of penalty tax for failure to file referred to in that paragraph is, notwithstanding the provisions of paragraphs (1) through (3), to be the amount obtained by adding, to the amount calculated under those provisions, the amount calculated by multiplying the payable tax amount prescribed in paragraph (1) by 10%:
where, within the period going back five years, counting from the day preceding the day on which the return filed after the due date or the amended return referred to in paragraph (1), item (ii) was filed (limited to one filed in anticipation that a reassessment or determination would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax) or the reassessment or determination was made, the taxpayer has had penalty tax for failure to file (excluding penalty tax imposed where the return filed after the due date or the amended return referred to in that item was not filed in anticipation that a reassessment or determination would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax) or heavy penalty tax (referred to as "penalty tax for failure to file, etc." in Article 68, paragraph (4), item (i) (Heavy Penalty Tax)) imposed with regard to the tax item to which the national tax pertaining to that return, reassessment or determination belongs; or
where the taxpayer has had penalty tax for failure to file (excluding penalty tax to which paragraph (8) applies) or heavy penalty tax under Article 68, paragraph (2) (hereinafter referred to as "specified penalty tax for failure to file, etc." in this item and in paragraph (4), item (ii) of that Article) imposed with regard to the tax item to which belongs that national tax whose taxable period began in the year preceding, or in the year two years before, the year that includes the first day of the taxable period of the national tax pertaining to the filing of the return filed after the due date or the amended return referred to in paragraph (1), item (ii) (excluding a filing made before a notice of examination concerning the national tax pertaining to the return is given, where it was not made in anticipation that a reassessment or determination would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax) or to the reassessment or determination (for that national tax without a taxable period, that national tax for which tax liability was established in the year preceding, or in the year two years before, the year that includes the day on which the tax liability for that national tax was established), or where it is found that an assessment and determination should be made with regard to specified penalty tax for failure to file, etc.
The provisions of paragraph (5) of the preceding Article apply mutatis mutandis to the case referred to in paragraph (1), item (ii).
前条第五項の規定は、第一項第二号の場合について準用する。
Article 66, paragraph (8)
If the filing of a return filed after the due date or of the amended return referred to in paragraph (1), item (ii) was not made in anticipation that a reassessment or determination would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax, and was made before a notice of examination concerning the national tax pertaining to the return was given, the amount of penalty tax for failure to file referred to in paragraph (1) on the tax amount payable under the provisions of Article 35, paragraph (2) based on that return is, notwithstanding the provisions of paragraphs (1) through (3), to be the amount calculated by multiplying that payable tax amount by 5%.
The provisions of paragraph (1) do not apply if the filing of a return filed after the due date was not made in anticipation that a determination under the provisions of Article 25 would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax, was made in a case specified by Cabinet Order as a case in which the taxpayer is found to have had the intention of filing a return by the due date, and was made by the day on which one month has elapsed from the statutory tax return due date.
The day a law or an amendment starts to apply. It is often months or years after promulgation, so that people have time to prepare. The Ministry of Justice's English usually says a law "comes into force" or "comes into effect", and sometimes calls the day its "enforcement date". Its "enforcement" more often means the word's other sense, carrying a law out, as in an Order for Enforcement (施行令), the Cabinet Order (政令) that sets out the details for carrying out an Act.