When a sole proprietor dies and the heir continues the business, what happens to the employees' social insurance

Bottom line first: When a sole proprietor dies and the heir continues the business, the treatment is fundamentally different from when a company's representative director dies. In a sole proprietorship the proprietor is a natural person, so when the proprietor dies, the social- and labour-insurance applicable workplace that had them as proprietor comes to a stop, and the successor takes over as a new proprietor. In practice it moves as a combination of "closure (extinction) of the applicable workplace under the former proprietor" and "new application (new establishment) with the successor as proprietor".

So what must not be stopped first is the employees' payroll and their social and labour insurance. The duty to pay wages follows the business. The quasi-final tax return of the deceased proprietor (Income Tax Act Article 125; within four months) and inheritance tax go to a tax accountant, succession of permits to a Gyoseishoshi, and inheritance registration to a judicial scrivener. What this office takes on is labour and social-insurance support; individual determinations are made by a qualified professional after a consultation.

When a sole proprietor dies, what happens to labour and social insurance?

For a company, even if the representative director dies the company itself remains, so social and labour insurance continue by a notification of the change of representative. In a sole proprietorship, however, the proprietor is that natural person. When the proprietor dies, the applicable workplace that had them as proprietor is generally treated as extinguished along with the closure of the business. Even where the successor continues the same business, because the successor is a separate person, the principle is to set up a new applicable workplace with the successor as proprietor.

Insurance	Under the deceased proprietor	Under the successor	Basis
Health insurance and employees' pension	Applicable workplace closure notification (within 5 days of the event)	New application notification (within 5 days of the event)	Health Insurance Enforcement Ordinance Article 20(1) and Article 19(1); Employees' Pension Enforcement Ordinance Article 13-2(1) and Article 13(1)
Labour insurance (accident and employment)	The insurance relation extinguishes the day after the closure or termination of the business; final premium return (within 50 days of extinction)	Insurance relation establishment notification (within 10 days of establishment); estimated premium return (within 50 days of establishment)	Act on Collection of Labour Insurance Premiums Article 5, Article 19(1), Article 4-2(1), Article 15(1)
Employment insurance	Applicable workplace abolition notification	Applicable workplace establishment notification	Employment Insurance Enforcement Ordinance Article 141(1)

However, whether succession by a sole proprietor's death is treated in labour insurance as "extinction + new establishment" or as a "change of proprietor" can differ depending on the practice of the labour bureau, Hello Work and the pension office, and on how the sameness of the business is viewed. Confirm the actual entry point of the procedure at the competent window just before you act. This article stays with the general principle and does not conclude on the individual handling. On the first response when a company's representative director dies, see When the president suddenly dies, how do the company's wages and social insurance move — the labour-side first response.

Is the employees' employment contract succeeded to the successor as it is?

This is the most misunderstood point in a sole proprietorship. The employment contract is between the employee and "the sole proprietor personally". Because the proprietor is a natural person, the proprietor's death means one party to the contract is lost. With a company the corporate personality remains, so the contract continues as it is; in a sole proprietorship there is no express provision that the employment contract is automatically succeeded to the successor.

Issue	Idea in a sole-proprietorship succession
Parties to the employment contract	The employee and the sole proprietor personally; the proprietor is a natural person
Whether it is succeeded	Not automatically transferred to the successor; the successor re-concludes it as a new employer (or it continues by implied agreement)
Disclosure of working conditions	Where it becomes a contract with the successor, disclose working conditions afresh (Labor Standards Act Article 15(1); Enforcement Ordinance Article 5)
Practical point	Organise the treatment of wages and service before switching, so no disadvantage arises to the employee

In reality, the successor continues the business as it is and the employees keep working, so the labour relation often does not break in substance. Even so, because "who is the employer" changes once, the point that avoids later disputes is to redo the disclosure of working conditions and to decide how the paid leave and retirement allowance service described below are treated. On designing employment contracts and working time, see also When you hire for short hours, what happens to social insurance.

How are paid leave, retirement allowance and the payroll cut-off treated?

Annual paid leave requires "continuous service" (Labor Standards Act Article 39). Even if the proprietor changes, where the sameness of the business is preserved and the labour relation is seen to substantively continue, the general idea is to aggregate the years of service. Resetting service to zero merely because the proprietor formally changed tends to cause later disputes.

Issue	Idea
Annual paid leave	Where the labour relation substantively continues, years of service are generally aggregated (Labor Standards Act Article 39)
Retirement allowance	Where there are rules, follow the rules; check aggregation or cut-off of service against the rules and the reality
Payroll cut-off	Do not mechanically cut at the date of death; organise the cut-off date, payment date and payer (the successor)
Unpaid wages	For wages that arose under the deceased proprietor, confirm individually where the duty to pay remains

Not stopping wages is the key to the first response. As long as the business continues, the wage payment date does not wait. Decide early, in parallel with settling the successor, who makes the immediate payments and decisions. However, the individual possibility of aggregating service and the attribution of unpaid wages differ depending on the sameness of the business and the state of the inheritance, and this article does not conclude on them.

How do the procedures for succeeding permits and the trade name differ from the labour procedures?

To continue the business, apart from labour and social-insurance procedures, procedures for permits and the trade name (including the tax opening and closure notifications) move separately. Because the qualifications in charge differ, each is a separate window and a separate contract.

Procedure	In charge
Switching employees' social and labour insurance, re-concluding employment contracts, continuing payroll	Shakai Hoken Roumushi (this office)
The deceased proprietor's closure notification and the successor's opening notification, inheritance tax and the quasi-final tax return	Tax accountant
Succession or re-acquisition of permits such as construction and food business	Gyoseishoshi
Inheritance registration (change of real-estate title), petition to renounce inheritance	Judicial scrivener and attorney

Whether the status of a permit can be succeeded, or the successor must re-acquire it, differs by industry. Succession of permits is Gyoseishoshi work, and 四葉行政書士事務所 is a business entity independent of this office. Where needed, we introduce them under a separate contract that you conclude directly, and this office takes no referral fee. On the labour side when the business is sold or reorganised on the occasion of an inheritance, see also At the time of business succession or M&A, what happens to labour and social insurance.

Who should handle the inheritance, registration, tax and labour?

Preparing for business succession splits by responsible entity.

Issue	In charge
Switching employees' social and labour insurance, re-concluding employment contracts, work rules and wage rules, continuing payroll	Shakai Hoken Roumushi (this office)
Inheritance tax, quasi-final tax return, closure and opening notifications and other tax	Tax accountant
Succession or re-acquisition of permits	Gyoseishoshi
Inheritance registration, registration of estate division	Judicial scrivener
Where there is a dispute among heirs	Attorney

四葉行政書士事務所 is a business entity independent of this office. Where needed, we introduce them under a separate contract that you conclude directly, and this office takes no referral fee.

What can 四葉社会保険労務士事務所 do?

What this office takes on is the labour and social-insurance first response and switching that continues the business while protecting the employees.

• The closure and abolition of the applicable workplace under the deceased proprietor, and the new application and establishment with the successor as proprietor
• Switching the employees' insured status (loss and acquisition) and managing the deadlines
• Re-concluding the employment contract with the successor and disclosing working conditions
• Organising the treatment of paid leave and retirement-allowance service, and reviewing the work rules and wage rules
• Designing the continuation of the payroll cut-off and payment

The following are not handled here.

• The deceased proprietor's closure notification and the successor's opening notification, inheritance tax and the quasi-final tax return → we connect you with a tax accountant (Zeirishi)
• Succession or re-acquisition of permits such as construction and food business → 四葉行政書士事務所 accepts these as a separate business entity
• Inheritance registration and registration of estate division → we connect you with a judicial scrivener (Shiho Shoshi)
• Disputes among heirs → we connect you with an attorney (Bengoshi)

四葉不動産株式会社, 四葉行政書士事務所 and 四葉社会保険労務士事務所 each accept work as an independent business entity, under a separate contract. Where another professional is introduced, you contract with them directly, and this office receives no referral fee.

Consultations are free of charge. Fees are set out in the fee schedule; see also our services and how a consultation proceeds.

Frequently asked questions

Q. When a sole proprietor dies, does social insurance stop once?
A. In a sole proprietorship the proprietor is the natural person, so the applicable workplace that had them as proprietor is generally treated as extinguished along with the closure of the business. Even where the successor continues the same business, a new applicable workplace with the successor as proprietor is set up, and the employees switch by loss and acquisition of status. This differs from a company's representative director dying, where the company remains and it continues by a change of representative. Confirm the actual entry point of the procedure at the competent pension office, labour bureau and Hello Work.

Q. Is the employees' employment contract automatically succeeded to the successor?
A. The employment contract is with the sole proprietor personally, and there is no express provision that it is automatically succeeded to the successor. In practice, the successor re-concludes the employment contract as a new employer (or it continues by implied agreement). Because the employer changes once, the points that avoid later disputes are to disclose working conditions afresh (Labor Standards Act Article 15(1)) and to decide the treatment of paid leave and retirement-allowance service.

Q. Does the years of service for paid leave reset to zero?
A. Annual paid leave requires continuous service (Labor Standards Act Article 39). Where the sameness of the business is preserved and the labour relation is seen to substantively continue, the general idea is to aggregate the years of service. Resetting service to zero merely because the proprietor formally changed tends to cause later disputes. The individual possibility of aggregation differs by circumstance, and this article does not conclude on it.

Q. Can a Shakai Hoken Roumushi handle the quasi-final tax return or inheritance tax?
A. The quasi-final tax return (Income Tax Act Article 125; within four months of the day after learning of the commencement of the inheritance) and the inheritance-tax return are the work of a tax accountant. This office takes on the switching of labour and social insurance and the re-conclusion of employment contracts, and connects you with a tax accountant for tax. Succession of permits is accepted by 四葉行政書士事務所 as a separate business entity, and inheritance registration by a judicial scrivener. Each is contracted separately, and there is no referral fee.

Basis for this article

• Health Insurance Enforcement Ordinance (Home Ministry Ordinance No. 36 of 1926) Article 19(1) (new application notification), Article 20(1) (closure notification), Article 24(1) (acquisition notification), Article 29(1) (loss notification) — the proprietor's notifications when a workplace becomes, or ceases to be, an applicable workplace (within 5 days of the event). Confirmed against the Japan Pension Service procedure guidance (referenced 27 August 2026)
• Employees' Pension Insurance Enforcement Ordinance (Ministry of Health and Welfare Ordinance No. 37 of 1954) Article 13(1) (new application notification), Article 13-2(1) (closure notification), Article 15(1) (acquisition notification), Article 22(1) (loss notification) — the same
• Act on Collection of Labour Insurance Premiums (Act No. 84 of 1969) Article 4-2(1) (insurance relation establishment notification; within 10 days of establishment), Article 5 (the insurance relation extinguishes as a matter of law the day after the closure or termination of the business), Article 15(1) (estimated premium return; within 50 days of establishment), Article 19(1) (final premium return; within 50 days of extinction)
• Employment Insurance Enforcement Ordinance (Ministry of Labour Ordinance No. 3 of 1975) Article 141(1) (applicable workplace establishment and abolition notifications)
• Labor Standards Act (Act No. 49 of 1947) Article 15(1); Enforcement Ordinance Article 5 — disclosure of working conditions (disclose afresh where it becomes a contract with the successor)
• Same Act, Article 39 — the continuous-service requirement of annual paid leave (where the labour relation substantively continues, years of service are generally aggregated)
• Same Act, Article 24 — the principle of full payment of wages and the like. The basis that the employees' wage payment is not stopped even amid the confusion of succession
• Income Tax Act (Act No. 33 of 1965) Article 125 — the tax return where a person dies during the year (quasi-final return). The heir files within four months of the day after learning of the commencement of the inheritance (tax is the work of a tax accountant; confirmed against the National Tax Agency's explanation, referenced 27 August 2026)
• Whether succession by a sole proprietor's death is treated in labour insurance as "extinction + new establishment" or as a "change of proprietor" can differ depending on the practice of the labour bureau, Hello Work and the pension office, and on how the sameness of the business is viewed. The individual handling is not covered here (unverified)
• Whether the status of a permit — such as a construction-business permit or food-business permit — can be succeeded differs by industry and governing law (permits are the work of a Gyoseishoshi). Not covered here (unverified)
• The attribution of unpaid wages and retirement allowance, and the possibility of aggregating years of service, differ depending on the sameness of the business and the state of the inheritance. Individual cases are not covered here (unverified)

This article is general information. Individual determinations are made by a qualified professional after a consultation, in light of individual circumstances. 四葉社会保険労務士事務所 can advise on the closure and abolition of the applicable workplace under the deceased proprietor and the new application and establishment with the successor as proprietor, switching the employees' insured status and managing the deadlines, re-concluding the employment contract with the successor and disclosing working conditions, organising the treatment of paid leave and retirement-allowance service, reviewing the work rules and wage rules, and designing the continuation of the payroll cut-off and payment. Tax such as inheritance tax and the quasi-final return is a matter we connect you with a tax accountant (Zeirishi) for; succession of permits is accepted by 四葉行政書士事務所 as a separate business entity, and inheritance registration by a judicial scrivener (Shiho Shoshi), each contracted separately. Where there is a dispute among heirs, we connect you with an attorney (Bengoshi). If a different professional is needed, each is contracted separately, and there is no referral fee. Frequently asked questions are collected in the FAQ. Written by Joji Uramatsu (Shakai Hoken Roumushi, Gyoseishoshi, Registered Real Estate Transaction Specialist).