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Income Tax Act

所得税法(しょとくぜいほう)

Section 2 Calculating Income in Each Class (Articles 50 to 56)

The law as Act Partially Amending the Income Tax Act, etc. (Act No. 12 of 2026) leaves it, with the words it changes marked.

The main text is read a page at a time: a chapter to a page, and a long chapter in runs of articles. The whole main text, and the supplementary provisions and appended tables this amendment changes. Those it leaves untouched are on the page for the text in force.

Article 50第五十条

Calculating Depreciation Allowances for Deferred Assets; Depreciation Methods(繰延資産の償却費の計算及びその償却の方法)
Article 50, paragraph (1)

The amount that, pursuant to the provisions of Article 37 (Necessary Expenses), is included in the necessary expenses that are used to calculate a Resident's real property income, business income, timber income, or miscellaneous income, as the depreciation allowance for a Deferred Asset that a Resident possesses on December 31 of the relevant year is the amount calculated pursuant to Cabinet Order on the basis of the period during which the expenses for the Deferred Assets continue to affect the calculation.

居住者のその年十二月三十一日における繰延資産につきその償却費として第三十七条(必要経費)の規定によりその者の不動産所得の金額、事業所得の金額、山林所得の金額又は雑所得の金額の計算上必要経費に算入する金額は、その繰延資産に係る支出の効果の及ぶ期間を基礎として政令で定めるところにより計算した金額とする。

Article 50, paragraph (2)

Beyond what is provided for in the preceding paragraph, Cabinet Order provides for the necessary particulars concerning the depreciation of Deferred Assets.

前項に定めるもののほか、繰延資産の償却に関し必要な事項は、政令で定める。

Division 3 Losses on Assets第三目 資産損失

Article 51第五十一条

Inclusion of Losses on Assets in Necessary Expenses(資産損失の必要経費算入)
Article 51, paragraph (1)

A loss incurred due to circumstances such as the demolition, removal, or destruction (including a decrease in value due to damage) of a Fixed Asset, or of any other equivalent asset as provided by Cabinet Order, which is used in a business run by a Resident that is meant to generate real property income, business income, or timber income (other than any part of the loss covered by insurance benefits, compensation for damage, or anything similar to these, and excluding loss due to or related to the transfer of an asset) is included in the necessary expenses that are used to calculate the Resident's real property income, business income, or timber income for the year in which the day of the loss falls.

居住者の営む不動産所得、事業所得又は山林所得を生ずべき事業の用に供される固定資産その他これに準ずる資産で政令で定めるものについて、取りこわし、除却、滅失(当該資産の損壊による価値の減少を含む。)その他の事由により生じた損失の金額(保険金、損害賠償金その他これらに類するものにより補てんされる部分の金額及び資産の譲渡により又はこれに関連して生じたものを除く。)は、その者のその損失の生じた日の属する年分の不動産所得の金額、事業所得の金額又は山林所得の金額の計算上、必要経費に算入する。

Article 51, paragraph (2)

A loss incurred in the course of business due to accounts receivable, loans, advance payments, or bad debt claims equivalent to these, or due to other circumstances as provided by Cabinet Order, in a business run by a Resident which is meant to generate real property income, business income, or timber income is included in the necessary expenses that are used to calculate the Resident's real property income, business income, or timber income for the year in which the day of the loss falls.

居住者の営む不動産所得、事業所得又は山林所得を生ずべき事業について、その事業の遂行上生じた売掛金、貸付金、前渡金その他これらに準ずる債権の貸倒れその他政令で定める事由により生じた損失の金額は、その者のその損失の生じた日の属する年分の不動産所得の金額、事業所得の金額又は山林所得の金額の計算上、必要経費に算入する。

Article 51, paragraph (3)

A loss due to Disaster, robbery, or misappropriation involving forested land owned by a Resident (other than any part of the loss covered by insurance benefits, compensation for damage, or anything similar to these) is included in the necessary expenses that are used to calculate the Resident's business income or timber income for the year in which the day of the loss falls.

災害又は盗難若しくは横領により居住者の有する山林について生じた損失の金額(保険金、損害賠償金その他これらに類するものにより補てんされる部分の金額を除く。)は、その者のその損失の生じた日の属する年分の事業所得の金額又は山林所得の金額の計算上、必要経費に算入する。

Article 51, paragraph (4)

A loss involving assets (other than forested land and assets prescribed in Article 62, paragraph (1) (Loss of Assets Not Ordinarily Necessary in Everyday Life, Due to Disaster)) used in the business operations of a Resident which are meant to generate real property income or miscellaneous income or are the basis of such income (other than any part of the loss covered by insurance benefits, compensation for damage, or anything similar to these; other than any loss due to or related to the transfer of an asset; and other than any loss prescribed in paragraph (1) or paragraph (2) or Article 72, paragraph (1) (Casualty Loss Deduction)) is included in the necessary expenses that are used to calculate the Resident's real property income or miscellaneous income for the year in which the day of the loss falls, up to the amount of the real property income or miscellaneous income for the year (meaning the amount of real property income or miscellaneous income for the year as calculated without applying the provisions of this paragraph).

居住者の不動産所得若しくは雑所得を生ずべき業務の用に供され又はこれらの所得の基因となる資産(山林及び第六十二条第一項(生活に通常必要でない資産の災害による損失)に規定する資産を除く。)の損失の金額(保険金、損害賠償金その他これらに類するものにより補てんされる部分の金額、資産の譲渡により又はこれに関連して生じたもの及び第一項若しくは第二項又は第七十二条第一項(雑損控除)に規定するものを除く。)は、それぞれ、その者のその損失の生じた日の属する年分の不動産所得の金額又は雑所得の金額(この項の規定を適用しないで計算したこれらの所得の金額とする。)を限度として、当該年分の不動産所得の金額又は雑所得の金額の計算上、必要経費に算入する。

Article 51, paragraph (5)

Cabinet Order provides for the necessary particulars concerning the calculation of the loss prescribed in paragraph (1) and the preceding two paragraphs.

第一項及び前二項に規定する損失の金額の計算に関し必要な事項は、政令で定める。

Division 4 Reserves第四目 引当金

Article 52第五十二条

Bad Debt Reserves(貸倒引当金)
Article 52, paragraph (1)

If a Resident running a business that is meant to generate real property income, business income, or timber income has accounts receivable, lendings, advance payments, or equivalent monetary claims (other than those that are to be represented by bonds; the same applies in the following paragraph) arising in the course of business (hereinafter referred to as "lendings and other claims" in this paragraph), any amount that the Resident transfers into the reserve account for bad debts in each year (other than a year in which the day of a complete business transfer or discontinuation falls; the same applies in the following paragraph) as the expected amount of the loss on those lendings and other claims on part of which a loss due to a bad debt or other equivalent circumstances is expected because a fact prescribed by Cabinet Order has occurred, such as their repayment being subject to a grace period or being made in installments based on a decision confirming a reorganization plan (this includes any other lendings and other claims held against the debtor associated with the lendings and other claims in question; hereinafter referred to as "individually assessed loans or other claims" in this paragraph and the following paragraph), is included in the necessary expenses that are used to calculate the Resident's real property income, business income, or timber income for the year, up to the amount calculated pursuant to Cabinet Order based on the part of the amount transferred which, as of December 31 of the relevant year (or as of the time of the Resident's death, if the Resident dies partway through the year; the same applies in the following paragraph), there is found to be no prospect of collecting or having repaid with regard to the individually assessed loans or other claims; provided, however, that this does not apply if the Resident dies and the heir does not take over the business.

不動産所得、事業所得又は山林所得を生ずべき事業を営む居住者が、その有する売掛金、貸付金、前渡金その他これらに準ずる金銭債権(債券に表示されるべきものを除く。次項において同じ。)で当該事業の遂行上生じたもの(以下この項において「貸金等」という。)のうち、更生計画認可の決定に基づいて弁済を猶予され、又は賦払により弁済されることその他の政令で定める事実が生じていることによりその一部につき貸倒れその他これに類する事由による損失が見込まれるもの(当該貸金等に係る債務者に対する他の貸金等がある場合には、当該他の貸金等を含む。以下この項及び次項において「個別評価貸金等」という。)のその損失の見込額として、各年(事業の全部を譲渡し、又は廃止した日の属する年を除く。次項において同じ。)において貸倒引当金勘定に繰り入れた金額については、当該金額のうち、その年十二月三十一日(その者が年の中途において死亡した場合には、その死亡の時。次項において同じ。)において当該個別評価貸金等の取立て又は弁済の見込みがないと認められる部分の金額を基礎として政令で定めるところにより計算した金額に達するまでの金額は、その者のその年分の不動産所得、事業所得又は山林所得の金額の計算上、必要経費に算入する。ただし、その者が死亡した場合において、その相続人が当該事業を承継しなかつたときは、この限りでない。

Article 52, paragraph (2)

The amount that a Blue-Return-filing Resident running a business that is meant to generate business income transfers into the reserve account for bad debts in any year as the expected amount of losses due to bad debts in accounts receivable, lendings, and equivalent monetary claims arising in the course of business (other than individually assessed lendings and other claims; hereinafter referred to as "collectively assessed loans" in this paragraph) is included in the necessary expenses that are used to calculate the Resident's business income for the year, up to the amount calculated pursuant to Cabinet Order based on the amount of collectively assessed loans that the Resident holds as of December 31 of the relevant year; provided, however, this does not apply if the Resident dies and the heir does not take over the business, and does not apply in any other case as prescribed by Cabinet Order.

青色申告書を提出する居住者で事業所得を生ずべき事業を営むものが、その有する売掛金、貸付金その他これらに準ずる金銭債権で当該事業の遂行上生じたもの(個別評価貸金等を除く。以下この項において「一括評価貸金」という。)の貸倒れによる損失の見込額として、各年において貸倒引当金勘定に繰り入れた金額については、当該金額のうち、その年十二月三十一日において有する一括評価貸金の額を基礎として政令で定めるところにより計算した金額に達するまでの金額は、その者のその年分の事業所得の金額の計算上、必要経費に算入する。ただし、その者が死亡した場合において、その相続人が当該事業を承継しなかつたとき、その他政令で定める場合は、この限りでない。

Article 52, paragraph (3)

The part of a reserve account for bad debts which is included in the necessary expenses that are used to calculate the real property income, business income, or timber income for the year in which that amount is transferred into the account pursuant to the provisions of the preceding two paragraphs is included in the gross revenue that is used to calculate the real property income, business income, or timber income for the year following that in which the amount is transferred into the account.

前二項の規定によりその繰入れをした年分の不動産所得の金額、事業所得の金額又は山林所得の金額の計算上必要経費に算入された貸倒引当金勘定の金額は、その繰入れをした年の翌年分の不動産所得の金額、事業所得の金額又は山林所得の金額の計算上、総収入金額に算入する。

Article 52, paragraph (4)

The provisions of paragraph (1) and paragraph (2) apply only if a Tax Return gives the details of the inclusion of the amount transferred into the reserve account for bad debts in necessary expenses.

第一項及び第二項の規定は、確定申告書に貸倒引当金勘定に繰り入れた金額の必要経費への算入に関する明細の記載がある場合に限り、適用する。

Article 52, paragraph (5)

Even if a Tax Return is filed that is not filled out as referred to in the preceding paragraph, the district tax office director may apply the provisions of paragraph (1) or paragraph (2) on finding there to be unavoidable circumstances for the Resident's failure to fill out the Tax Return in that manner.

税務署長は、前項の記載がない確定申告書の提出があつた場合においても、その記載がなかつたことについてやむを得ない事情があると認めるときは、第一項又は第二項の規定を適用することができる。

Article 52, paragraph (6)

Cabinet Order provides for the necessary particulars concerning the handling, in the event of the death of a Resident as prescribed in paragraph (1) or paragraph (2), of any amount of a reserve account for bad debts that has been included in the necessary expenses that are used to calculate the real property income, business income, or timber income for the year in which the date of the Resident's death falls.

第一項又は第二項に規定する居住者が死亡した場合において、これらの規定によりその者の死亡の日の属する年分の不動産所得の金額、事業所得の金額又は山林所得の金額の計算上必要経費に算入された貸倒引当金勘定の金額があるときにおける当該貸倒引当金勘定の金額の処理に関し必要な事項は、政令で定める。

Article 53第五十三条

Article 53, paragraph (1)

No English for this provision yet.

削除

Article 54第五十四条

Reserves for Severance Packages(退職給与引当金)
Article 54, paragraph (1)

If a Blue-Return-filing Resident running a business that is meant to generate business income has established rules for severance packages as prescribed by Cabinet Order, the amount that the Resident transfers to the severance package reserves account in any year to cover severance packages that are paid to employees of the business (other than a spouse or other relative whose living expenses are paid from the same resources as the Resident; hereinafter the same applies in this Article) upon their separation from employment is included in the necessary expenses that are used to calculate the Resident's business income for the year, up to the amount calculated pursuant to Cabinet Order based on the amount of any increase that is found to have arisen in the year in the estimated amount that the Resident would have to pay in severance packages if all employees of the business that the Resident employs as of December 31 of that year (or as of the time of Resident's death, if the Resident dies partway through the year) were to resign of their own accord.

青色申告書を提出する居住者で事業所得を生ずべき事業を営むもののうち、政令で定める退職給与規程を定めているものが、その事業に係る使用人(その居住者と生計を一にする配偶者その他の親族を除く。以下この条において同じ。)の退職により支給する退職給与に充てるため、各年において退職給与引当金勘定に繰り入れた金額については、当該金額のうち、その年十二月三十一日(その居住者が年の中途において死亡した場合には、その死亡の時)において在職するその事業に係る使用人の全員が自己の都合により退職するものと仮定して計算した場合に退職給与として支給されるべき金額の見積額のうちその年において増加したと認められる部分の金額を基礎として政令で定めるところにより計算した金額に達するまでの金額は、その居住者のその年分の事業所得の金額の計算上、必要経費に算入する。

Article 54, paragraph (2)

A Resident holding monies under a severance package reserves account (but only amounts of monies included in the necessary expenses that are used to calculate business income for the year in which that amount is transferred into the account pursuant to the provisions of the preceding paragraph; this excludes any monies that it has already been established must be withdrawn pursuant to the provisions of this paragraph; hereinafter the same applies in this Article) must withdraw the monies under the severance package reserves account if an employee as referred to in the preceding paragraph separates from employment, if approval to file a Blue Return is rescinded, or in any other case prescribed by Cabinet Order.

退職給与引当金勘定の金額(前項の規定によりその繰入れをした年分の事業所得の金額の計算上必要経費に算入されたものに限るものとし、既にこの項の規定により取りくずすべきこととなつたものを除く。以下この条において同じ。)を有する居住者は、前項の使用人が退職した場合、青色申告書の提出の承認を取り消された場合その他政令で定める場合には、政令で定めるところにより、その退職給与引当金勘定の金額を取りくずさなければならない。

Article 54, paragraph (3)

An amount of monies under a severance package reserves account which it has been established must be withdrawn pursuant to the provisions of the preceding paragraph is included in the gross revenue that is used to calculate the amount of business income for the year in which the day it was established that the amount was to have been withdrawn falls; and any amount of monies under a severance package reserves account which is withdrawn even though it does not fall under the provisions of that paragraph is included in the gross revenue that is used to calculate business income for the year in which the day it is withdrawn falls.

前項の規定により取りくずすべきこととなつた退職給与引当金勘定の金額又は同項の規定に該当しないで取りくずした退職給与引当金勘定の金額は、それぞれその取りくずすべきこととなつた日又は取りくずした日の属する年分の事業所得の金額の計算上、総収入金額に算入する。

Article 54, paragraph (4)

The provisions of paragraph (1) apply only if a Tax Return gives the details of the inclusion of the amount transferred into the severance package reserves account in necessary expenses.

第一項の規定は、確定申告書に退職給与引当金勘定に繰り入れた金額の必要経費への算入に関する明細の記載がある場合に限り、適用する。

Article 54, paragraph (5)

Even if a Tax Return is filed that is not filled out as referred to in the preceding paragraph, the district tax office director may apply the provisions of paragraph (1) on finding there to be unavoidable circumstances for the Resident's failure to fill out the Tax Return in that manner.

税務署長は、前項の記載がない確定申告書の提出があつた場合においても、その記載がなかつたことについてやむを得ない事情があると認めるときは、第一項の規定を適用することができる。

Article 54, paragraph (6)

Beyond what is prescribed in paragraph (2) to the preceding paragraph, Cabinet Order provides for the handling of amounts of monies under severance package reserves accounts following the death of the Resident holding them and for other necessary particulars concerning the application of the provisions of paragraph (1).

第二項から前項までに定めるもののほか、退職給与引当金勘定の金額を有する居住者が死亡した場合における当該退職給与引当金勘定の金額の処理その他第一項の規定の適用に関し必要な事項は、政令で定める。

Article 55第五十五条

Article 55, paragraph (1)

No English for this provision yet.

削除

Division 5 Consideration That Relatives Receive from Business第五目 親族が事業から受ける対価

Article 56第五十六条

Special Provisions on Necessary Expenses If Relatives Receive Consideration from a Resident's Business(事業から対価を受ける親族がある場合の必要経費の特例)
Article 56, paragraph (1)

If, due to reasons such as being employed in a business run by a Resident which is meant to generate real property income, business income, or timber income, the spouse or any other relative whose living expenses are paid from the same resources as a Resident is paid a consideration by that business, an amount equal to that consideration is not to be included in the necessary expenses that are used to calculate the real property income, business income, or timber income from the Resident's business, and any amount that is to be included in the necessary expenses that are used to calculate the relative's Income in Each Class from that consideration is included in the necessary expenses that are used to calculate the real property income, business income, or timber income from the Resident's business. In such a case, the amount of the consideration paid to the relative and amounts to be included in the necessary expenses that are used to calculate the relative's Income in Each Class from consideration are deemed not to be a part of the calculation of the relative's Income in Each Class.

居住者と生計を一にする配偶者その他の親族がその居住者の営む不動産所得、事業所得又は山林所得を生ずべき事業に従事したことその他の事由により当該事業から対価の支払を受ける場合には、その対価に相当する金額は、その居住者の当該事業に係る不動産所得の金額、事業所得の金額又は山林所得の金額の計算上、必要経費に算入しないものとし、かつ、その親族のその対価に係る各種所得の金額の計算上必要経費に算入されるべき金額は、その居住者の当該事業に係る不動産所得の金額、事業所得の金額又は山林所得の金額の計算上、必要経費に算入する。この場合において、その親族が支払を受けた対価の額及びその親族のその対価に係る各種所得の金額の計算上必要経費に算入されるべき金額は、当該各種所得の金額の計算上ないものとみなす。

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