Changes to Japanese law on 1 December 2025

6 laws on this site changed on this day, as amendments . For each: the law that amends it, and a link to e-Gov's text of the law as amended. The wording before and after is not on this site.

Residential Basic Book Act
住民基本台帳法（じゅうみんきほんだいちょうほう）
Amended by
- Act on the Development of Related Acts for the Promotion of Reform to Enhance Regional Autonomy and Independence (Act No. 35 of 2025)
  地域の自主性及び自立性を高めるための改革の推進を図るための関係法律の整備に関する法律（令和七年法律第三十五号）
  The text after this amendment, on e-Gov
Employees' Pension Insurance Act
厚生年金保険法（こうせいねんきんほけんほう）
Amended by
- Act Partially Amending the National Pension Act, etc., and Other Matters, to Strengthen the Functions of the Pension System in Light of Socioeconomic Changes (Act No. 74 of 2025)
  社会経済の変化を踏まえた年金制度の機能強化のための国民年金法等の一部を改正する等の法律（令和七年法律第七十四号）
  The text after this amendment, on e-Gov
National Pension Act
国民年金法（こくみんねんきんほう）
Amended by
- Act Partially Amending the National Pension Act, etc., and Other Matters, to Strengthen the Functions of the Pension System in Light of Socioeconomic Changes (Act No. 74 of 2025)
  社会経済の変化を踏まえた年金制度の機能強化のための国民年金法等の一部を改正する等の法律（令和七年法律第七十四号）
  The text after this amendment, on e-Gov
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. (Act No. 13 of 2025)
  所得税法等の一部を改正する法律（令和七年法律第十三号）
  The text after this amendment, on e-Gov
Regulation for Enforcement of the Income Tax Act
所得税法施行規則（しょとくぜいほうしこうきそく）
Amended by
- Ministerial Order Partially Amending the Regulation for Enforcement of the Income Tax Act (Ministry of Finance Order No. 18 of 2025)
  所得税法施行規則の一部を改正する省令（令和七年財務省令第十八号）
  The text after this amendment, on e-Gov
Act on Special Measures Concerning Taxation
租税特別措置法（そぜいとくべつそちほう）
Amended by
- Act Partially Amending the Income Tax Act, etc. (Act No. 13 of 2025)
  所得税法等の一部を改正する法律（令和七年法律第十三号）
  The text after this amendment, on e-Gov

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