# 国民年金法 / National Pension Act — 第二十七条の二 (Article 27-2)

- Law: 国民年金法 (National Pension Act), 昭和三十四年法律第百四十一号
- English title "National Pension Act": Ministry of Justice translation database, which lists the title
- Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say.
- Provision: 第二十七条の二 (Article 27-2)（改定率の改定等） — address `art-27-2`
- Text in force since: 2026-10-01
- URL (the page that opens at this provision): https://japanlaw.org/en/national-pension-act/art-27-2
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/334AC0000000141/art-27-2
- Every provision below carries its address and both URLs on the line under it.
- Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below.

Only the Japanese as published by the government has legal effect; the text
below is a copy of it. Every English rendering below is a translation and
says which kind: the Ministry of Justice's translation, or this
site's machine translation, whose model and date the Sources list names.
They are never merged and never substituted for one another.

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### 第二十七条の二（改定率の改定等） — Revision, etc. of the Revision Rate
<sup>caption: machine translation, not official</sup>
<sup>art-27-2 · https://japanlaw.org/en/national-pension-act/art-27-2 · https://japanlaw.org/l/334AC0000000141/art-27-2</sup>

  **第一項**  平成十六年度における改定率は、一とする。
  <sup>art-27-2/par-1 · https://japanlaw.org/en/national-pension-act/art-27-2/par-1 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-1</sup>
  The revision rate in fiscal year 2004 is 1.
  <sup>machine translation, not official</sup>

  **第二項**  改定率については、毎年度、第一号に掲げる率（以下「物価変動率」という。）に第二号及び第三号に掲げる率を乗じて得た率（以下「名目手取り賃金変動率」という。）を基準として改定し、当該年度の四月以降の年金たる給付について適用する。
  <sup>art-27-2/par-2 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2</sup>
  The revision rate is revised each fiscal year based on the rate obtained by multiplying the rate listed in item (i) (hereinafter referred to as the "price change rate") by the rates listed in item (ii) and item (iii) (hereinafter referred to as the "nominal net wage change rate"), and is applied to a benefit that is a pension from April of that fiscal year onward.
  <sup>machine translation, not official</sup>

    **一**  当該年度の初日の属する年の前々年の物価指数（総務省において作成する年平均の全国消費者物価指数をいう。以下同じ。）に対する当該年度の初日の属する年の前年の物価指数の比率
    <sup>art-27-2/par-2/item-1 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-1 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-1</sup>
    The ratio of the price index for the year preceding the year in which the first day of that fiscal year falls, to the price index for the year two years before the year in which the first day of that fiscal year falls (meaning the annual average national consumer price index prepared by the Ministry of Internal Affairs and Communications; the same applies hereinafter);
    <sup>machine translation, not official</sup>

    **二**  イに掲げる率をロに掲げる率で除して得た率の三乗根となる率
    <sup>art-27-2/par-2/item-2 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-2</sup>
    A rate that is the cube root of the rate obtained by dividing the rate set forth in (a) by the rate set forth in (b);
    <sup>machine translation, not official</sup>

      **イ**  当該年度の初日の属する年の五年前の年の四月一日の属する年度における厚生年金保険の被保険者に係る標準報酬平均額（厚生年金保険法第四十三条の二第一項第二号イに規定する標準報酬平均額をいう。以下この号及び第八十七条第五項第二号イにおいて同じ。）に対する当該年度の前々年度における厚生年金保険の被保険者に係る標準報酬平均額の比率
      <sup>art-27-2/par-2/item-2/sub-1 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-2/sub-1 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-2/sub-1</sup>
      The ratio of the average standardized amount of remuneration for insureds relating to insured persons of Employees' Pension Insurance in the fiscal year two years before that fiscal year, to the average standardized amount of remuneration for insureds relating to insured persons of Employees' Pension Insurance in the fiscal year in which April 1 of the year five years before the year in which the first day of that fiscal year falls, falls (meaning the average standardized amount of remuneration for insureds prescribed in Article 43-2, paragraph (1), item (ii), (a) of the Employees' Pension Insurance Act; the same applies in this item and in Article 87, paragraph (5), item (ii), (a));
      <sup>machine translation, not official</sup>

      **ロ**  当該年度の初日の属する年の五年前の年における物価指数に対する当該年度の初日の属する年の前々年における物価指数の比率
      <sup>art-27-2/par-2/item-2/sub-2 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-2/sub-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-2/sub-2</sup>
      The ratio of the price index for the year two years before the year in which the first day of that fiscal year falls, to the price index for the year five years before the year in which the first day of that fiscal year falls.
      <sup>machine translation, not official</sup>

    **三**  イに掲げる率をロに掲げる率で除して得た率
    <sup>art-27-2/par-2/item-3 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-3 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-3</sup>
    The rate obtained by dividing the rate set forth in (a) by the rate set forth in (b).
    <sup>machine translation, not official</sup>

      **イ**  〇・九一〇から当該年度の初日の属する年の三年前の年の九月一日における厚生年金保険法の規定による保険料率（以下「保険料率」という。）の二分の一に相当する率を控除して得た率
      <sup>art-27-2/par-2/item-3/sub-1 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-3/sub-1 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-3/sub-1</sup>
      The rate obtained by deducting, from 0.910, a rate equivalent to one-half of the premium rate under the provisions of the Employees' Pension Insurance Act (hereinafter referred to as the "premium rate") as of September 1 of the year three years before the year in which the first day of that fiscal year falls;
      <sup>machine translation, not official</sup>

      **ロ**  〇・九一〇から当該年度の初日の属する年の四年前の年の九月一日における保険料率の二分の一に相当する率を控除して得た率
      <sup>art-27-2/par-2/item-3/sub-2 · https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-3/sub-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-3/sub-2</sup>
      The rate obtained by deducting, from 0.910, a rate equivalent to one-half of the premium rate as of September 1 of the year four years before the year in which the first day of that fiscal year falls.
      <sup>machine translation, not official</sup>

  **第三項**  前項の規定による改定率の改定の措置は、政令で定める。
  <sup>art-27-2/par-3 · https://japanlaw.org/en/national-pension-act/art-27-2/par-3 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-3</sup>
  The measures for revising the revision rate under the provisions of the preceding paragraph are specified by Cabinet Order.
  <sup>machine translation, not official</sup>

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## Cites
- art-27-2/par-2: 第一号 → 国民年金法 第二十七条の二第二項第一号 (Article 27-2, paragraph (2), item (i)), art-27-2/par-2/item-1 — https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-1 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-1
- art-27-2/par-2: 第二号 → 国民年金法 第二十七条の二第二項第二号 (Article 27-2, paragraph (2), item (ii)), art-27-2/par-2/item-2 — https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-2
- art-27-2/par-2: 第三号 → 国民年金法 第二十七条の二第二項第三号 (Article 27-2, paragraph (2), item (iii)), art-27-2/par-2/item-3 — https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-3 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-3
- art-27-2/par-2/item-2/sub-1: 厚生年金保険法第四十三条の二第一項第二号 → 厚生年金保険法 第四十三条の二第一項第二号 (Article 43-2, paragraph (1), item (ii)), art-43-2/par-1/item-2 — https://japanlaw.org/en/employees-pension-insurance-act/art-43-2/par-1/item-2 · https://japanlaw.org/l/329AC0000000115/art-43-2/par-1/item-2
- art-27-2/par-2/item-2/sub-1: この号 → 国民年金法 第二十七条の二第二項第二号 (Article 27-2, paragraph (2), item (ii)), art-27-2/par-2/item-2 — https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-2
- art-27-2/par-2/item-2/sub-1: 第八十七条第五項第二号 → 国民年金法 第八十七条第五項第二号 (Article 87, paragraph (5), item (ii)), art-87/par-5/item-2 — https://japanlaw.org/en/national-pension-act/art-87/par-5/item-2 · https://japanlaw.org/l/334AC0000000141/art-87/par-5/item-2
- art-27-2/par-3: 前項 → 国民年金法 第二十七条の二第二項 (Article 27-2, paragraph (2)), art-27-2/par-2 — https://japanlaw.org/en/national-pension-act/art-27-2/par-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2

## Cited by

9 provisions cite this one. No official source publishes this direction.

- 国民年金法 第二十七条第一項（年金額） — https://japanlaw.org/en/national-pension-act/art-27/par-1 · https://japanlaw.org/l/334AC0000000141/art-27/par-1
- 国民年金法 第二十七条の二第二項（改定率の改定等） — https://japanlaw.org/en/national-pension-act/art-27-2/par-2 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2
- 国民年金法 第二十七条の二第二項第二号イ（改定率の改定等） — https://japanlaw.org/en/national-pension-act/art-27-2/par-2/item-2/sub-1 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-2/item-2/sub-1
- 国民年金法 第二十七条の二第三項（改定率の改定等） — https://japanlaw.org/en/national-pension-act/art-27-2/par-3 · https://japanlaw.org/l/334AC0000000141/art-27-2/par-3
- 国民年金法 第二十七条の三第一項 — https://japanlaw.org/en/national-pension-act/art-27-3/par-1 · https://japanlaw.org/l/334AC0000000141/art-27-3/par-1
- 国民年金法 第二十七条の四第一項（調整期間における改定率の改定の特例） — https://japanlaw.org/en/national-pension-act/art-27-4/par-1 · https://japanlaw.org/l/334AC0000000141/art-27-4/par-1
- 国民年金法 附則第十一条第一項（平成十七年度から平成二十年度までにおける改定率の改定に関する経過措置） — https://japanlaw.org/en/national-pension-act/suppl-4161-104/art-11/par-1 · https://japanlaw.org/l/334AC0000000141/suppl-4161-104/art-11/par-1
- 国民年金法 附則第十一条第二項（平成十七年度から平成二十年度までにおける改定率の改定に関する経過措置） — https://japanlaw.org/en/national-pension-act/suppl-4161-104/art-11/par-2 · https://japanlaw.org/l/334AC0000000141/suppl-4161-104/art-11/par-2
- 国民年金法 附則第十一条第三項（平成十七年度から平成二十年度までにおける改定率の改定に関する経過措置） — https://japanlaw.org/en/national-pension-act/suppl-4161-104/art-11/par-3 · https://japanlaw.org/l/334AC0000000141/suppl-4161-104/art-11/par-3

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## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 国民年金法 — the text in force from 2026-10-01 (https://laws.e-gov.go.jp/law/334AC0000000141/20261001_507AC0000000074), retrieved 2026-10-05
- Japanese Law Translation Database System, Ministry of Justice (法務省) — 国民年金法 — its English title as the Ministry of Justice's translation database lists it (https://www.japaneselawtranslation.go.jp/en/laws/view/1772), retrieved 2026-09-18
- claude-sonnet-5 — Machine translation, batch national-pension-act-20260923T214903-006, translated 2026-09-24
- claude-sonnet-5-5 — Machine translation, batch national-pension-act-20261013T095554-001, translated 2026-10-13
- This site's parser, version 211 — 国民年金法 — structure, counts, cross-references and defined terms, computed 2026-10-05