第四十一条（定時決定）
An insurer determines the standard monthly remuneration based on the monthly remuneration amount which is obtained by dividing the total amount of remuneration received by the insured person at the place of business at which the person is employed as of July 1 each year for the preceding three-month period (limited to a period of consecutive employment at the place of business, and excluding any month in which the number of days based on which remuneration is paid is less than 17 days (11 days for persons specified by Order of the Ministry of Health, Labour and Welfare; the same applies in Article 43, paragraph (1), Article 43-2, paragraph (1) and Article 43-3, paragraph (1))) by the number of months in that period.
保険者等は、被保険者が毎年七月一日現に使用される事業所において同日前三月間（その事業所で継続して使用された期間に限るものとし、かつ、報酬支払の基礎となった日数が十七日（厚生労働省令で定める者にあっては、十一日。第四十三条第一項、第四十三条の二第一項及び第四十三条の三第一項において同じ。）未満である月があるときは、その月を除く。）に受けた報酬の総額をその期間の月数で除して得た額を報酬月額として、標準報酬月額を決定する。
A standard monthly remuneration determined pursuant to the provisions of the preceding paragraph is the standard monthly remuneration of each month from September in the relevant year until August in the following year.
前項の規定によって決定された標準報酬月額は、その年の九月から翌年の八月までの各月の標準報酬月額とする。
Regarding persons who obtained eligibility as an insured person during the period between June 1 and July 1 or insured persons whose standard monthly remuneration has been or is to be revised in any month from July through September pursuant to the provisions of Articles 43, 43-2 or 43-3, the provisions of paragraph (1) do not apply during that year.
Article 42Determination upon Acquisition of Eligibility as an Insured Person
第四十二条（被保険者の資格を取得した際の決定）
When a person who obtains eligibility as an insured person, the insurer determines the standard monthly remuneration with the amounts listed below as the monthly remuneration amount:
if the wages are determined on the basis of a monthly, weekly or other fixed period, the amount equivalent to thirty times the amount obtained by dividing the amount of the remuneration as of the day on which eligibility as an insured person is obtained by the total number of days in that period;
if the remuneration is determined on the basis of working days or hours, or in accordance with a piece rate or other contract price, the average of the amounts of remuneration received by persons engaged in similar work at the place of business for one month preceding the month in which eligibility as an insured person is obtained and who receive similar remuneration;
if it is difficult to calculate pursuant to the provisions of the preceding two items, the amount of remuneration received by a person engaged in similar work in the region for one month preceding the month in which eligibility as an insured person is obtained and who receives similar remuneration; or
in the case of receiving remuneration corresponding to two or more of the preceding three items, the total sum of the amounts calculated for each pursuant to the provisions of the preceding three items.
A standard monthly remuneration determined pursuant to the provisions of the preceding paragraph is the standard monthly remuneration of each month since the day on which the person obtained eligibility as an insured person until August in that year (August in the following year if the person obtained eligibility as an insured person between July 1 to December 31).
第四十三条（改定）
If the amount obtained by dividing the total amount of remuneration received for three consecutive months at the place of business employing an insured person (in each month, the number of days based on which remuneration is paid must be no less than 17 days) by three is significantly higher or lower than the person's monthly remuneration that is the basis of the standard monthly remuneration and the insurer finds it necessary, the insurer may revise the standard monthly remuneration by setting the first-mentioned amount as the monthly remuneration amount starting from the month following the months in which the monthly remuneration amount was significantly high or low.
A standard monthly remuneration revised pursuant to the provisions of the preceding paragraph is the standard monthly remuneration for each month until August in that year (until August in the following year for a revision in any month from July to December).
前項の規定によって改定された標準報酬月額は、その年の八月（七月から十二月までのいずれかの月から改定されたものについては、翌年の八月）までの各月の標準報酬月額とする。
Article 43-2Amount Revised When Childcare Leave Ends
第四十三条の二（育児休業等を終了した際の改定）
If childcare leave prescribed in Article 2, item (i) of the Act on the Welfare of Workers Taking Child Care or Family Care Leave to Care for Children or Other Family Members (Act No. 76 of 1991), leave through a measure equivalent to the system for childcare leave prescribed in Article 23, paragraph (2) of the same Act or a measure taken in the same manner as the system for childcare leave prescribed in item (ii) of the same paragraph pursuant to the provisions of Article 24, paragraph (1) of the same Act, or childcare leave based on laws and regulations specified by Cabinet Order (hereinafter referred to as "childcare leave") taken by an insured person ends and the person is taking care of a child less than three years of age to which the childcare leave pertains on the last day of the childcare leave (referred to as "last day of childcare leave" hereinafter in this Article) after submitting a request to the insurer via the employer of the place of business employing the person as specified by Order of the Ministry of Health, Labour and Welfare, the standard monthly remuneration is revised by setting the amount obtained by dividing the total amount of remuneration received for the three months beginning with the month which includes the day following the last day of childcare leave (limited to a period of consecutive employment at the place of business employing the person on the day following the last day of childcare leave; and excluding any month in which the number of days based on which remuneration is paid is less than 17 days) by the number of months in that period as the monthly remuneration amount, notwithstanding the provisions of Article 41; provided, however, that this does not apply to an insured person who commences the maternity leave prescribed in paragraph (1) of the following Article on the day following the last day of childcare leave.
保険者等は、育児休業、介護休業等育児又は家族介護を行う労働者の福祉に関する法律（平成三年法律第七十六号）第二条第一号に規定する育児休業、同法第二十三条第二項の育児休業に関する制度に準ずる措置若しくは同法第二十四条第一項（第二号に係る部分に限る。）の規定により同項第二号に規定する育児休業に関する制度に準じて講ずる措置による休業又は政令で定める法令に基づく育児休業（以下「育児休業等」という。）を終了した被保険者が、当該育児休業等を終了した日（以下この条において「育児休業等終了日」という。）において当該育児休業等に係る三歳に満たない子を養育する場合において、その使用される事業所の事業主を経由して厚生労働省令で定めるところにより保険者等に申出をしたときは、第四十一条の規定にかかわらず、育児休業等終了日の翌日が属する月以後三月間（育児休業等終了日の翌日において使用される事業所で継続して使用された期間に限るものとし、かつ、報酬支払の基礎となった日数が十七日未満である月があるときは、その月を除く。）に受けた報酬の総額をその期間の月数で除して得た額を報酬月額として、標準報酬月額を改定する。ただし、育児休業等終了日の翌日に次条第一項に規定する産前産後休業を開始している被保険者は、この限りでない。
A standard monthly remuneration revised pursuant to the provisions of the preceding paragraph is the standard monthly remuneration for each month since the month following the month which includes the day on which two years have elapsed since the day following the last day of childcare leave until August in that year (August in the following year if that following month is any of September to December).
Article 43-3Amount Revised after End of Maternity Leave
第四十三条の三（産前産後休業を終了した際の改定）
If maternity leave (meaning not engaging in labor for the period from 42 days (98 days in the case of multiple fetuses) before the day of childbirth (the due date of childbirth if the day of childbirth is after the due date of childbirth) to 56 days after the day of childbirth (limited to not engaging in labor for reasons relating to pregnancy or childbirth); hereinafter the same applies) taken by an insured person ends and the person is taking care of a child to which the maternity leave pertains on the last day of the maternity leave (referred to as "last day of maternity leave" hereinafter in this Article) after submitting a request to the insurer via the employer of the place of business employing the person as specified by Order of the Ministry of Health, Labour and Welfare, the standard monthly remuneration is revised by setting the amount obtained by dividing the total amount of remuneration received for the three months beginning with the month which includes the day following the last day of maternity leave (limited to a period of consecutive employment at the place of business employing the person on the day following the last day of maternity leave; and excluding any month in which the number of days based on which remuneration is paid is less than 17 days) by the number of months in that period as the monthly remuneration amount, notwithstanding the provisions of Article 41; provided, however, that this does not apply to an insured person who commences childcare leave on the day following the last day of maternity leave.
保険者等は、産前産後休業（出産の日（出産の日が出産の予定日後であるときは、出産の予定日）以前四十二日（多胎妊娠の場合においては、九十八日）から出産の日後五十六日までの間において労務に服さないこと（妊娠又は出産に関する事由を理由として労務に服さない場合に限る。）をいう。以下同じ。）を終了した被保険者が、当該産前産後休業を終了した日（以下この条において「産前産後休業終了日」という。）において当該産前産後休業に係る子を養育する場合において、その使用される事業所の事業主を経由して厚生労働省令で定めるところにより保険者等に申出をしたときは、第四十一条の規定にかかわらず、産前産後休業終了日の翌日が属する月以後三月間（産前産後休業終了日の翌日において使用される事業所で継続して使用された期間に限るものとし、かつ、報酬支払の基礎となった日数が十七日未満である月があるときは、その月を除く。）に受けた報酬の総額をその期間の月数で除して得た額を報酬月額として、標準報酬月額を改定する。ただし、産前産後休業終了日の翌日に育児休業等を開始している被保険者は、この限りでない。
A standard monthly remuneration revised pursuant to the provisions of the preceding paragraph is the standard monthly remuneration for each month since the month following the month which includes the day on which two years have elapsed since the day following the last day of maternity leave until August in that year (August in the following year if that following month is any of September to December).
Article 44Special Provisions for Calculation of Monthly Remuneration
第四十四条（報酬月額の算定の特例）
If it is difficult to calculate an insured person's monthly remuneration amount pursuant to the provisions of Article 41, paragraph (1), Article 42, paragraph (1), Article 43-2, paragraph (1) or paragraph (1) of the preceding Article, or if the amount calculated pursuant to the provisions of Article 41, paragraph (1), Article 42, paragraph (1), Article 43, paragraph (1), Article 43-2, paragraph (1) or paragraph (1) of the preceding Article is found to be significantly unjustifiable, notwithstanding these provisions, the insured person's monthly remuneration amount is an amount determined by the insurer.
In the case of the preceding paragraph, if the insurer is a health insurance society, the calculation method in the same paragraph must be specified by the constitution.
In calculating the monthly remuneration amount for an insured person who receives remuneration at two or more places of business at the same time, the total sum of the amounts calculated pursuant to the provisions of Article 41, paragraph (1), Article 42, paragraph (1), Article 43, paragraph (1), Article 43-2, paragraph (1), or paragraph (1) of the preceding Article or paragraph (1) is the person's monthly remuneration amount.