①A taxpayer must pay delinquent tax if any of the following items applies:

②The 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for the period until the due date for payment (if permission for postponement of tax payment or for payment in kind has been revoked, the day on which the document concerning that revocation was issued; the same applies hereinafter in this paragraph and in Article 63, paragraphs (1), (4) and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.

③The 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.

④Delinquent 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.

①Where an amended return has been filed (excluding an amended return filed by a taxpayer who has evaded payment of a national tax or received a national tax refund by deception or other wrongful acts, while anticipating that a reassessment will be made of the national tax because of the examination having been conducted with regard to the national tax (referred to as a "specified amended return" in the following paragraph)) or where a reassessment has been made (excluding a reassessment made of the national tax to be paid by a taxpayer who has evaded payment of a national tax or received a national tax refund by deception or other wrongful acts (referred to as a "specified reassessment" in that paragraph)), if the case falls under any of the following items, the provisions of paragraph (2) of the preceding Article apply to the national tax payable by filing the return or based on the reassessment, with the period specified in the relevant item being deducted from the period prescribed in the paragraph:

②Where an amended return has been filed or a reassessment increasing the payable tax amount (including a reassessment specified by Cabinet Order as being similar thereto; referred to as a "reassessment increasing the tax" in this paragraph) has been made, if a return filed by the due date or a return filed after the due date has been submitted for the national tax to which the return or the reassessment increasing the tax pertains, and the amended return has been filed or the reassessment increasing the tax has been made after a reassessment reducing the tax amount payable by filing the return filed by the due date or the return filed after the due date (including a reassessment specified by Cabinet Order as being similar thereto; referred to as a "reassessment reducing the tax" in this paragraph) has been made, then, notwithstanding the provisions of the preceding paragraph, the provisions of paragraph (2) of the preceding Article apply to the national tax payable by filing the amended return or based on the reassessment increasing the tax (limited to the national tax specified by Cabinet Order as the portion up to the tax amount pertaining to the return filed by the due date or the return filed after the due date (including the tax amount equivalent to the amount of a refund); the same applies hereinafter in this paragraph), with 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)) being deducted from the period prescribed in that paragraph:

③For a national withholding tax that falls under any of the national taxes listed in the following items, the provisions of paragraph (2) of the preceding Article apply with the period specified in the relevant item being deducted from the period prescribed in that paragraph; provided, however, that this does not apply if there has been deception or any other wrongful act with regard to the failure to pay that national tax by the statutory payment due date (for the national tax listed in item (ii), limited to where it was paid in anticipation that a notice of tax payment under the provisions of Article 36, paragraph (1) (Notice of Tax Payment) would be given for that national tax because an examination had been conducted with regard to that national tax):

①When part of the national tax that is the basis for the calculation of the amount of delinquent tax has been paid, the tax amount that is the basis for the calculation of the amount of delinquent tax for the period on and after the day following the day of that payment is to be the amount obtained by deducting the tax amount so paid.

②Where delinquent tax is to be paid together with the national tax pursuant to the provisions of Article 60, paragraph (3) (Payment of Delinquent Tax), until the amount paid by the taxpayer reaches the amount of the national tax that is the basis for the calculation of that delinquent tax, the amount so paid is to be treated as having been first appropriated to the national tax that is the basis for that calculation.

①If a tax payment grace period has been granted under the provisions of Article 46, paragraph (1) or paragraph (2), item (i), (ii) or (v) (limited to the part concerning facts similar to facts that fall under item (i) or (ii) of that paragraph) (Tax Payment Grace Period due to a Disaster, etc.) (hereinafter referred to as a "tax payment grace period due to a disaster, etc." in this paragraph) or the execution of the delinquent tax collection procedure has been suspended under the provisions of Article 153, paragraph (1) (Suspension of Delinquent Tax Collection Procedure) of the National Tax Collection Act, or if a tax payment grace period has been granted under the provisions of Article 46, paragraph (2), item (iii), (iv) or (v) (limited to the part concerning facts similar to facts that fall under item (iii) or (iv) of that paragraph) or paragraph (3) (hereinafter referred to as a "tax payment grace period due to discontinuance of business, etc." in this paragraph) or a grace period for realization has been granted under the provisions of Article 151, paragraph (1) or Article 151-2, paragraph (1) (Requirements for Grace Period for Realization) of that Act, then, of the delinquent tax on the national tax for which the grace period has been granted or the execution has been suspended, the amount equivalent to the amount of the portion corresponding to the period of the tax payment grace period due to a disaster, etc. or of that suspension of execution, or the amount equivalent to one half of the amount of the portion corresponding to the period of the tax payment grace period due to discontinuance of business, etc. or of that grace period for realization (limited to the period after the day on which two months have elapsed from the day following the due date for payment of that national tax), respectively, is exempted; provided, however, that if a fact has arisen that would be grounds for revocation under the provisions of Article 49, paragraph (1) (Revocation of Tax Payment Grace Period) (including as applied mutatis mutandis pursuant to Article 152, paragraph (3) or (4) (Installment Payment, Notice, etc. concerning Grace Period for Realization) of that Act) or Article 154, paragraph (1) (Revocation of Suspension of Delinquent Tax Collection Procedure) of that Act, the regional commissioner, district director or director-general of a customs house may decline to grant the exemption for the amount of the portion corresponding to the period on and after the day on which that fact arose.

②If the due date for payment of a national tax has been extended under the provisions of Article 11 (Extension of Time Limits), the amount of the portion of the delinquent tax on that national tax corresponding to the period of that extension is exempted.

③Where a tax payment grace period or a grace period for realization under the provisions of Article 151, paragraph (1) or Article 151-2, paragraph (1) of the National Tax Collection Act has been granted, if the taxpayer falls under any of the following items, the regional commissioner, district director or director-general of a customs house may exempt the delinquent tax on the national tax for which the grace period has been granted (excluding the portion exempted under the provisions of the preceding two paragraphs; the same applies hereinafter in this paragraph), up to the amount of the portion corresponding to the grace period (including, if the regional commissioner, district director or director-general of a customs house finds that there are unavoidable reasons for the failure to pay that national tax within that period, the period from the day following the last day of the grace period until the day on which those unavoidable reasons ceased) that is found to be difficult to pay:

④If a collection grace period has been granted for a national tax pursuant to the proviso to Article 23, paragraph (5) (Relationship between Request for Reassessment and Collection of National Tax) or other provisions of the national tax laws, the amount equivalent to one half of the amount of the portion of the delinquent tax on the national tax under that grace period that corresponds to the period, within the grace period, after the day on which two months have elapsed from the day following the due date for payment of that national tax (if delinquent tax has been exempted under the provisions of the preceding three paragraphs, excluding any period that falls within the period to which that exemption pertains) is exempted.

⑤If the regional commissioner, district director or director-general of a customs house has made a seizure (including a disposition equivalent to seizure that, in the case where a request has been made, based on the provisions of a tax treaty, etc., to the treaty partner of that tax treaty, etc. for assistance in the collection of a national tax subject to collection assistance or for assistance in the conservation of property for collection, that treaty partner makes under the laws and regulations of that treaty partner with regard to that national tax subject to collection assistance; the same applies hereinafter in this paragraph) of property necessary to collect the full amount of a delinquent national tax, or has received the provision of security equivalent to the payable tax amount (including the provision of security that, in the case where a request has been made, based on the provisions of a tax treaty, etc., to the treaty partner of that tax treaty, etc. for assistance in the collection of a national tax subject to collection assistance or for assistance in the conservation of property for collection, that treaty partner receives under the laws and regulations of that treaty partner with regard to that national tax subject to collection assistance; the same applies hereinafter in this paragraph), they may exempt the delinquent tax calculated on the basis of the national tax to which the seizure or the provision of security pertains, up to the amount equivalent to one half of the amount of the portion corresponding to the period, within the period during which the seizure or the provision of security is in effect, after the day on which two months have elapsed from the day following the due date for payment of that national tax (if delinquent tax has been exempted under the provisions of the preceding paragraphs, excluding any period that falls within the period to which that exemption pertains).

⑥If any of the following items applies, the regional commissioner, district director or director-general of a customs house may exempt the delinquent tax on the national tax prescribed in the relevant item (excluding the portion exempted under the provisions of the preceding paragraphs), up to the amount of the portion corresponding to the period listed in that item:

①A 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.

②The 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).

③The 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".

①Where a return filed by the due date (including a return of refund claim; the same applies in paragraph (3)) has been filed (including where a return filed after the due date has been filed and the proviso to paragraph (1) or paragraph (9) of the following Article applies), if an amended return has been filed or a reassessment has been made, penalty tax for understatement 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 amended return or reassessment by 10% (or by 5% if the amended return was not filed in anticipation that a reassessment would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax).

②In the case falling under the provisions of the preceding paragraph (excluding where the provisions of paragraph (6) apply), if the payable tax amount prescribed in the preceding paragraph (if, before the amended return or reassessment referred to in that paragraph, an amended return had been filed or a reassessment had been made of the national tax to which that amended return or reassessment pertains, the amount obtained by adding the cumulative increased tax amount for that national tax) exceeds the amount equivalent to the tax amount on the return filed by the due date for that national tax or 500,000 yen, whichever is greater, the amount of penalty tax for understatement referred to in that 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%.

③In the preceding paragraph, the meanings of the terms listed in the following items are as prescribed respectively in those items:

④In the case falling under the provisions of paragraph (1), if, before the amended return was filed or the reassessment was made (hereinafter referred to as an "amended return, etc." in this paragraph) with regard to matters to be entered or recorded in the books (limited to those specified by Ministry of Finance Order, and including, where an electronic or magnetic record has been prepared or retained in lieu of the preparation or retention of the books, that electronic or magnetic record; the same applies hereinafter in this paragraph and in paragraph (5) of the following Article), the taxpayer was requested by the relevant official of the National Tax Agency, a Regional Taxation Bureau or a tax office (hereinafter referred to as the "relevant official" in this paragraph and in paragraph (5) of that Article) 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 understatement referred to in paragraph (1) is, notwithstanding the provisions of that paragraph and paragraph (2), 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 amended return, 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)):

⑤In the cases listed in the following items, the provisions of paragraph (1) or (2) apply with the amount calculated, as provided for by Cabinet Order, as the tax amount specified in the relevant item being deducted from the payable tax amount prescribed in those paragraphs:

⑥The provisions of paragraph (1) do not apply where the filing of an amended return was not made in anticipation that a reassessment 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 notification of the matters listed in Article 74-9, paragraph (1), items (iv) and (v) (Advance Notice of Examination to Persons with Tax Liability, etc.) and other matters specified by Cabinet Order with regard to the examination concerning the national tax pertaining to the return (referred to as "examination notification" in paragraph (6), item (ii) and paragraph (8) of the following Article).

①In 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:

②In 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%.

③In 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:

④In 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):

⑤In 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)):

⑥In 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%:

⑦The provisions of paragraph (5) of the preceding Article apply mutatis mutandis to the case referred to in paragraph (1), item (ii).

⑧If 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%.

⑨The 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.

①If a national withholding tax has not been paid in full by its statutory payment due date, the district director or director-general of a customs house collects from the taxpayer penalty tax for failure to pay in an amount equivalent to the amount calculated by multiplying the tax amount pertaining to the notice of tax payment (meaning a notice of tax payment under the provisions of Article 36, paragraph (1) (Notice of Tax Payment) (limited to one pertaining to item (ii) of that paragraph); the same applies in the following paragraph) or the tax amount paid after the statutory payment due date without that notice having been received by 10%; provided, however, that this does not apply if there is found to be a justifiable reason for the failure to pay the national tax pertaining to that notice or payment by the statutory payment due date.

②Where a national withholding tax has been paid after its statutory payment due date without a notice of tax payment having been received, if the payment was not made in anticipation that the notice would be given for that national tax because an examination had been conducted with regard to that national tax, the amount of penalty tax for failure to pay referred to in the preceding paragraph on the tax amount so paid is, notwithstanding the provisions of that paragraph, to be the amount calculated by multiplying the tax amount so paid by 5%.

③The provisions of paragraph (1) do not apply where a payment falling under the provisions of the preceding paragraph has been made, if the payment was made in a case specified by Cabinet Order as a case in which the taxpayer is found to have had the intention of paying by the statutory payment due date, and the national withholding tax pertaining to that payment was paid by the day on which one month has elapsed from the statutory payment due date.

①In the case falling under the provisions of Article 65, paragraph (1) (Penalty Tax for Understatement) (excluding where the filing of an amended return was not made in anticipation that a reassessment would be made of the national tax pertaining to the return because an examination had been conducted with regard to that national tax), if the taxpayer has concealed or disguised all or part of the facts that are to form the basis for the calculation of the tax basis, etc. or tax amount, etc. of that national tax, and has filed a tax return or a written request for reassessment prescribed in Article 23, paragraph (3) (Request for Reassessment) (referred to as a "written request for reassessment" in the following paragraph) based on what was concealed or disguised, heavy penalty tax is imposed on the taxpayer, as provided for by Cabinet Order, in lieu of penalty tax for understatement on the tax amount that is to form the basis for the calculation of the amount of penalty tax for understatement (if any of that tax amount is clearly based on facts that are to form the basis for its calculation and that were not concealed or disguised, the tax amount obtained by deducting the amount calculated, as provided for by Cabinet Order, as the tax amount based on those facts not concealed or disguised), in an amount equivalent to the amount calculated by multiplying that tax amount that is to form the basis by 35%.

②In the case falling under the provisions of Article 66, paragraph (1) (Penalty Tax for Failure to File) (excluding where the proviso to that paragraph or paragraph (9) of that Article applies, or where the filing of a tax return 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), if the taxpayer has concealed or disguised all or part of the facts that are to form the basis for the calculation of the tax basis, etc. or tax amount, etc. of that national tax, and, based on what was concealed or disguised, has not filed a tax return by the statutory tax return due date, or has filed a tax return or a written request for reassessment after the statutory tax return due date, heavy penalty tax is imposed on the taxpayer, as provided for by Cabinet Order, in lieu of penalty tax for failure to file on the tax amount that is to form the basis for the calculation of the amount of penalty tax for failure to file (if any of that tax amount is clearly based on facts that are to form the basis for its calculation and that were not concealed or disguised, the tax amount obtained by deducting the amount calculated, as provided for by Cabinet Order, as the tax amount based on those facts not concealed or disguised), in an amount equivalent to the amount calculated by multiplying that tax amount that is to form the basis by 40%.

③In the case falling under the provisions of paragraph (1) of the preceding Article (excluding where the proviso to that paragraph or paragraph (2) or (3) of that Article applies), if the taxpayer has concealed or disguised all or part of the facts and, based on what was concealed or disguised, has not paid that national tax by its statutory payment due date, the district director or director-general of a customs house collects from the taxpayer, in lieu of penalty tax for failure to pay on the tax amount that is to form the basis for the calculation of the amount of penalty tax for failure to pay (if any of that tax amount is clearly based on facts that are to form the basis for its calculation and that were not concealed or disguised, the tax amount obtained by deducting the amount calculated, as provided for by Cabinet Order, as the tax amount based on those facts not concealed or disguised), heavy penalty tax in an amount equivalent to the amount calculated by multiplying that tax amount that is to form the basis by 35%.

④In the case falling under the provisions of the preceding three paragraphs, if any of the following items applies (in the case falling under the provisions of paragraph (1) or the preceding paragraph, item (i)), the amount of heavy penalty tax referred to in the preceding three paragraphs is, notwithstanding those provisions, to be the amount obtained by adding, to the amount calculated under those provisions, the amount calculated by multiplying the tax amount that is to form the basis prescribed in those provisions by 10%:

Penalty tax for understatement, failure to file, non-payment, and heavy penalty tax (hereinafter collectively referred to as "penalty tax") are to be national tax falling under the tax items which apply to the tax amount that is the basis for the calculation of the amount of such penalty tax.