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on 1 January 2027, in 2 months

Income Tax Act

所得税法(しょとくぜいほう)

Amended by

Act Partially Amending the Income Tax Act, etc.

所得税法等の一部を改正する法律

The whole text as amended, on e-Gov

The same amending law also changes

  • 1 April 2025 — Consumption Tax Act
  • 1 April 2025 — Corporation Tax Act
  • 1 April 2025 — This law
  • 1 April 2025 — Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures
  • 1 April 2025 — National Tax Collection Act
  • 1 April 2025 — Act on General Rules for National Taxes
  • 1 April 2025 — Act on Special Measures for Securing the Financial Resources Necessary to Implement Measures for Reconstruction following the Great East Japan Earthquake
  • 1 April 2025 — Act on Special Measures Concerning Taxation
  • 1 May 2025 — Act on Special Measures Concerning Taxation
  • 1 October 2025 — Act on Special Measures Concerning Taxation
  • 21 November 2025 — Act on Special Measures Concerning Taxation
  • 1 December 2025 — This law
  • 1 December 2025 — Act on Special Measures Concerning Taxation
  • 18 December 2025 — Corporation Tax Act
  • 18 December 2025 — This law
  • 1 January 2026 — This law
  • 1 January 2026 — Act on Special Measures Concerning Taxation
  • 1 April 2026 — Corporation Tax Act
  • 1 April 2026 — This law
  • 1 April 2026 — National Tax Collection Act
  • 1 April 2026 — Act on General Rules for National Taxes
  • 1 April 2026 — Act on Special Measures for Securing the Financial Resources Necessary to Implement Measures for Reconstruction following the Great East Japan Earthquake
  • 1 April 2026 — Act on Special Measures Concerning Taxation
  • 1 October 2026 — Consumption Tax Act
  • 1 October 2026 — Corporation Tax Act
  • 1 October 2026 — This law
  • 1 November 2026 — Consumption Tax Act
  • 1 November 2026 — Act on General Rules for National Taxes
  • 1 November 2026 — Act on Special Measures Concerning Taxation
  • 1 January 2027 — Consumption Tax Act
  • 1 January 2027 — Act on Special Measures Concerning Taxation

5 provisions changed · 2 provisions added · 1 provision in the supplementary provisions · 2 provisions moved to another number

Each provision the amendment changes, as it will read: the words it adds are underlined, and a bar marks where it removes words. “Show removed words” strikes those through in place; “Before and after” sets the two wordings side by side. A provision that only moves to another number says the number it had. The Japanese is the law; the icon beside each English column says whose English it is.

How the changes are shown

Underlined: words the amendment adds. A bar: where it removes words.Underlined: words the amendment adds. Struck through: the words it removes.Underlined: words the amendment adds. Struck through: the words it removes.

Article 120 · (Filing an Income Tax Return)第百二十条(確定所得申告)

2 added · 2 moved
Read it in the amended law
  • AddedArticle 120, paragraph (6)

    If a Resident making an entry for a deduction for small enterprise-based mutual aid premiums and similar payments, life insurance premium deduction, or earthquake insurance premium deduction in a return under paragraph (1) files the return, the Resident may, in lieu of attaching or presenting the document specified in item (i) of paragraph (3) pursuant to that paragraph (limited to the part relating to those deductions), attach to the return an itemized statement that states the particulars specified by Ministry of Finance Order as the particulars stated in that document.

    第一項の規定による申告書に小規模企業共済等掛金控除、生命保険料控除又は地震保険料控除に関する事項の記載をする居住者が当該申告書を提出する場合には、第三項の規定による同項第一号に定める書類(これらの控除に係る部分に限る。)の添付又は提示に代えて、当該書類に記載されている事項として財務省令で定める事項の記載がある明細書を当該申告書に添付することができる。

    Act No. 12 of 2026 changes it again, on .

  • AddedArticle 120, paragraph (7)

    If a return to which the itemized statement prescribed in the preceding paragraph has been attached pursuant to that paragraph is filed, the district director may, when it is found to be necessary, request the person who filed that return (hereinafter referred to as a "person applying the deduction for small enterprise-based mutual aid premiums and similar payments or similar deduction" in this paragraph) to present or submit the document prescribed in the preceding paragraph, until the day on which five years have elapsed counting from the day following the Filing Deadline for that return (or, if a request for Reassessment under Article 23, paragraph (1) of the Act on General Rules for National Taxes has been made within six months before that day, the day on which six months have elapsed from the date on which that request for Reassessment was made). In this case, when a request under the first sentence of this paragraph has been made, the person applying the deduction for small enterprise-based mutual aid premiums and similar payments or similar deduction must present or submit that document.

    税務署長は、前項の規定により同項に規定する明細書が添付された申告書の提出があつた場合において、必要があると認めるときは、当該申告書を提出した者(以下この項において「小規模企業共済等掛金控除等適用者」という。)に対し、当該申告書に係る確定申告期限の翌日から起算して五年を経過する日(同日前六月以内に国税通則法第二十三条第一項の規定による更正の請求があつた場合には、当該更正の請求があつた日から六月を経過する日)までの間、前項に規定する書類の提示又は提出を求めることができる。この場合において、この項前段の規定による求めがあつたときは、当該小規模企業共済等掛金控除等適用者は、当該書類を提示し、又は提出しなければならない。

    Act No. 12 of 2026 changes it again, on .

  • Article 120, paragraph (8)Its words stay the same; only its number changes.
  • Article 120, paragraph (9)Its words stay the same; only its number changes.

Article 122 · (Filing a Return to Receive a Refund)第百二十二条(還付等を受けるための申告)

Read it in the amended law
  • ChangedArticle 122, paragraph (3)

    The provisions of the second sentence of Article 120, paragraph (1) apply mutatis mutandis to the information to be given in a return under the preceding two paragraphs, and the provisions of paragraphs (3) through (7)(9) of that Article apply mutatis mutandis to the filing of a return under the preceding two paragraphs. In such a case, the term "Filing Deadline" in paragraph (5)paragraphs (5) and (7) of that Article is deemed to be replaced with "Filing Deadline (or the day on which the return is filed, if the return is a return of refund claim as prescribed in Article 61, paragraph (1), item (ii) (Special Provisions for Base Period for Calculation of Amount of Delinquent Tax) of the Act on General Rules for National Taxes)", and the term "Act on General Rules for National Taxes" is deemed to be replaced with "that Act".

    第百二十条第一項後段の規定は前二項の規定による申告書の記載事項について、同条第三項から第七項第九項までの規定は前二項の規定による申告書の提出について、それぞれ準用する。この場合において、同条第五項及び第七項中「確定申告期限」とあるのは「確定申告期限(当該申告書が国税通則法第六十一条第一項第二号(延滞税の額の計算の基礎となる期間の特例)に規定する還付請求申告書である場合には、当該申告書の提出があつた日)」と、「国税通則法」とあるのは「同法」と読み替えるものとする。

Article 123 · (Filing Tax Returns Showing Losses)第百二十三条(確定損失申告)

Read it in the amended law
  • ChangedArticle 123, paragraph (3)

    The provisions of Article 120, paragraphs (3) through (7)(9) apply mutatis mutandis to the filing of a return under paragraph (1). In such a case, the term "Filing Deadline" in paragraph (5)paragraphs (5) and (7) of that Article is deemed to be replaced with "Filing Deadline (or the day on which the return is filed, if the return is a return of refund claim as prescribed in Article 61, paragraph (1), item (ii) (Special Provisions for Base Period for Calculation of Amount of Delinquent Tax) of the Act on General Rules for National Taxes)", and the term "Act on General Rules for National Taxes" is deemed to be replaced with "that Act".

    第百二十条第三項から第七項第九項までの規定は、第一項の規定による申告書の提出について準用する。この場合において、同条第五項及び第七項中「確定申告期限」とあるのは「確定申告期限(当該申告書が国税通則法第六十一条第一項第二号(延滞税の額の計算の基礎となる期間の特例)に規定する還付請求申告書である場合には、当該申告書の提出があつた日)」と、「国税通則法」とあるのは「同法」と読み替えるものとする。

Article 125 · (Filing a Tax Return If the Taxpayer Has Died Partway Through the Year)第百二十五条(年の中途で死亡した場合の確定申告)

Read it in the amended law
  • ChangedArticle 125, paragraph (4)

    The provisions of the second sentence of Article 120, paragraph (1) apply mutatis mutandis to the information to be given in a return under paragraph (1) or paragraph (2), and the provisions of paragraphs (3) through (7)(9) of that Article apply mutatis mutandis to the filing of a return under the preceding three paragraphs. In such a case, the term "Filing Deadline" in paragraph (5)paragraphs (5) and (7) of that Article is deemed to be replaced with "Filing Deadline (or the day on which the return is filed, if the return is a return of refund claim as prescribed in Article 61, paragraph (1), item (ii) (Special Provisions for Base Period for Calculation of Amount of Delinquent Tax) of the Act on General Rules for National Taxes)", and the term "Act on General Rules for National Taxes" is deemed to be replaced with "that Act".

    第百二十条第一項後段の規定は第一項又は第二項の規定による申告書の記載事項について、同条第三項から第七項第九項までの規定は前三項の規定による申告書の提出について、それぞれ準用する。この場合において、同条第五項及び第七項中「確定申告期限」とあるのは「確定申告期限(当該申告書が国税通則法第六十一条第一項第二号(延滞税の額の計算の基礎となる期間の特例)に規定する還付請求申告書である場合には、当該申告書の提出があつた日)」と、「国税通則法」とあるのは「同法」と読み替えるものとする。

Article 127 · (Filing a Tax Return If the Taxpayer Will Become Absent From Japan Partway Through the Year)第百二十七条(年の中途で出国をする場合の確定申告)

Read it in the amended law
  • ChangedArticle 127, paragraph (4)

    The provisions of the second sentence of Article 120, paragraph (1) apply mutatis mutandis to the information to be given in a return under paragraph (1) or paragraph (2), and the provisions of paragraphs (3) through (7)(9) of that Article apply mutatis mutandis to the filing of a return under the preceding three paragraphs. In such a case, the term "Filing Deadline" in paragraph (5)paragraphs (5) and (7) of that Article is deemed to be replaced with "Filing Deadline (or the day on which the return is filed, if the return is a return of refund claim as prescribed in Article 61, paragraph (1), item (ii) (Special Provisions for Base Period for Calculation of Amount of Delinquent Tax) of the Act on General Rules for National Taxes)", and the term "Act on General Rules for National Taxes" is deemed to be replaced with "that Act".

    第百二十条第一項後段の規定は第一項又は第二項の規定による申告書の記載事項について、同条第三項から第七項第九項までの規定は前三項の規定による申告書の提出について、それぞれ準用する。この場合において、同条第五項及び第七項中「確定申告期限」とあるのは「確定申告期限(当該申告書が国税通則法第六十一条第一項第二号(延滞税の額の計算の基礎となる期間の特例)に規定する還付請求申告書である場合には、当該申告書の提出があつた日)」と、「国税通則法」とあるのは「同法」と読み替えるものとする。

Article 166 · (Filing of Returns, Payment of Taxes, and Issuance of Refunds)第百六十六条(申告、納付及び還付)

Read it in the amended law
  • ChangedArticle 166, paragraph (1)

    The provisions of Part II, Chapter V and Chapter VI (Filing of Returns, Payment of Taxes, and Issuance of Refunds for Residents) apply mutatis mutandis to the filing of returns, payment of taxes, and issuance of refunds for a Nonresident's Income Taxes Imposed on Aggregate Income. In such a case, in Article 112, paragraph (2) (Process of Applying for Approval for a Reduction of Tax Prepayments), the term "transactions" is deemed to be replaced with "transactions (for a Nonresident with a permanent establishment, including those falling under internal dealings as prescribed in Article 161, paragraph (1), item (i) (Domestic Source Income))" and the phrase "that paragraph" is deemed to be replaced with "the preceding paragraph"; in Article 120, paragraph (1) (Filing an Income Tax Return), the phrase "foreign tax credit" is deemed to be replaced with "credit under Article 165-6, paragraphs (1) through (3) (Foreign Tax Credit for Nonresidents)"; in item (iii) of that paragraph, the phrase "Chapter III (Calculation of Tax Amount)" is deemed to be replaced with "Chapter III (excluding Article 93 (Credit for the Amount Equivalent to the Foreign Tax Adjusted at Distribution) and Article 95 (Foreign Tax Credit)) (Calculation of Tax Amount), and Article 165-5-3 (Credit for Amount Equivalent to Foreign Tax Adjusted at Distribution for Nonresidents) and Article 165-6"; in paragraph (6)(8) of that Article, the phrase "business that generates timber income" is deemed to be replaced with "business that generates timber income (limited to business related to the domestic source income specified in the items of Article 164, paragraph (1) (How Nonresidents Are Taxed); hereinafter referred to as "specified business" in this paragraph)", the phrase "business that generates miscellaneous income" is deemed to be replaced with "specified business that generates miscellaneous income", the phrase "that business" is deemed to be replaced with "that specified business", and the phrase "must be attached to that return" is deemed to be replaced with "must be attached to that return, and if a Nonresident conducting business both in Japan and outside Japan files a return under that paragraph, a detailed statement of revenue and expenditures as prescribed by Ministry of Finance Order must be attached to that return"; in Article 122, paragraph (1), item (i) (Filing a Return to Receive a Refund), the phrase "foreign tax credit" is deemed to be replaced with "credit under Article 165-6, paragraphs (1) through (3) (Foreign Tax Credit for Nonresidents)"; in paragraph (2) of that Article, the phrase "Article 95, paragraph (2) or (3) (Foreign Tax Credit)" is deemed to be replaced with "Article 165-6, paragraph (2) or (3)"; in Article 123, paragraph (2), item (vi) (Filing Tax Returns Showing Losses), the phrase "Article 95 (Foreign Tax Credit)" is deemed to be replaced with "Article 165-6 (Foreign Tax Credit for Nonresidents)"; in Article 143 (Blue Returns), the term "business" is deemed to be replaced with "business (limited to business related to the domestic source income specified in the items of Article 164, paragraph (1) (How Nonresidents Are Taxed))"; in Article 144 (Application for Approval to File a Blue Return), the phrase "commences business" is deemed to be replaced with "commences business (limited to business related to the domestic source income specified in the items of Article 164, paragraph (1) (How Nonresidents Are Taxed))"; in Article 145, item (ii) (Denial of Applications for Approval to File a Blue Return), the term "transactions" is deemed to be replaced with "transactions (for a Nonresident with a permanent establishment, including those falling under internal dealings as prescribed in Article 161, paragraph (1), item (i) (Domestic Source Income); the same applies in Article 148, paragraph (1) and Article 150, paragraph (1), item (iii) (Rescission of Approval to File a Blue Return))"; and in Article 147 (When a Resident Is Deemed to Receive Approval to File a Blue Return), the term "business" is deemed to be replaced with "business (limited to business related to the domestic source income specified in the items of Article 164, paragraph (1) (How Nonresidents Are Taxed))".

    前編第五章及び第六章(居住者に係る申告、納付及び還付)の規定は、非居住者の総合課税に係る所得税についての申告、納付及び還付について準用する。この場合において、第百十二条第二項(予定納税額の減額の承認の申請手続)中「取引」とあるのは「取引(恒久的施設を有する非居住者にあつては、第百六十一条第一項第一号(国内源泉所得)に規定する内部取引に該当するものを含む。)」と、「同項」とあるのは「前項」と、第百二十条第一項(確定所得申告)中「外国税額控除」とあるのは「第百六十五条の六第一項から第三項まで(非居住者に係る外国税額の控除)の規定による控除」と、同項第三号中「第三章(税額の計算)」とあるのは「第三章(第九十三条(分配時調整外国税相当額控除)及び第九十五条(外国税額控除)を除く。)(税額の計算)並びに第百六十五条の五の三(非居住者に係る分配時調整外国税相当額の控除)及び第百六十五条の六」と、同条第六項第八項中「山林所得を生ずべき業務」とあるのは「山林所得を生ずべき業務(第百六十四条第一項各号(非居住者に対する課税の方法)に定める国内源泉所得に係るものに限る。以下この項において「特定業務」という。)」と、「雑所得を生ずべき業務」とあるのは「雑所得を生ずべき特定業務」と、「業務に」とあるのは「特定業務に」と、「ならない」とあるのは「ならないものとし、国内及び国外の双方にわたつて業務を行う非居住者が同項の規定による申告書を提出する場合には、収入及び支出に関する明細書で財務省令で定めるものを当該申告書に添付しなければならないものとする」と、第百二十二条第一項第一号(還付等を受けるための申告)中「外国税額控除」とあるのは「第百六十五条の六第一項から第三項まで(非居住者に係る外国税額の控除)の規定による控除」と、同条第二項中「第九十五条第二項又は第三項(外国税額控除)」とあるのは「第百六十五条の六第二項又は第三項」と、第百二十三条第二項第六号(確定損失申告)中「第九十五条(外国税額控除)」とあるのは「第百六十五条の六(非居住者に係る外国税額の控除)」と、第百四十三条(青色申告)中「業務」とあるのは「業務(第百六十四条第一項各号(非居住者に対する課税の方法)に定める国内源泉所得に係るものに限る。)」と、第百四十四条(青色申告の承認の申請)中「業務を開始した場合」とあるのは「業務(第百六十四条第一項各号(非居住者に対する課税の方法)に定める国内源泉所得に係るものに限る。)を開始した場合」と、第百四十五条第二号(青色申告の承認申請の却下)中「取引」とあるのは「取引(恒久的施設を有する非居住者にあつては、第百六十一条第一項第一号(国内源泉所得)に規定する内部取引に該当するものを含む。第百四十八条第一項及び第百五十条第一項第三号(青色申告の承認の取消し)において同じ。)」と、第百四十七条(青色申告の承認があつたものとみなす場合)中「業務」とあるのは「業務(第百六十四条第一項各号(非居住者に対する課税の方法)に定める国内源泉所得に係るものに限る。)」と読み替えるものとする。

1 change in the supplementary provisions (附則)

Supplementary Provisions, Article 8 · Transitional Measures Concerning Documents to Be Attached to Tax Returns附則第八条(確定申告書の添付書類に関する経過措置)

Read it in the amended law
  • AddedSupplementary Provisions, Article 8, paragraph (2)

    The provisions of Article 120, paragraphs (6) and (7) of the New Income Tax Act (including as applied mutatis mutandis pursuant to Article 122, paragraph (3), Article 123, paragraph (3), Article 125, paragraph (4) and Article 127, paragraph (4) of the New Income Tax Act) apply in the case where a Tax Return for income tax for 2026 or subsequent years is submitted on or after January 1, 2027.

    新所得税法第百二十条第六項及び第七項(これらの規定を新所得税法第百二十二条第三項、第百二十三条第三項、第百二十五条第四項及び第百二十七条第四項において準用する場合を含む。)の規定は、令和九年一月一日以後に令和八年分以後の所得税に係る確定申告書を提出する場合について適用する。