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When you are sent by your employer in Japan to work in a foreign country, you may have to enroll in the local social security system in addition to the Japanese social security system, and may have to pay contributions to both countries.

Under the Social Security Agreements, you will be covered only by the system of the country where you work. When you are sent by your employer in Japan to the branch office in the agreement country or you are locally hired by the employer in the agreement country, you will be covered only by the system of the country.

However, when you are temporarily sent to the agreement country for the expected period of not more than 5 years, you are subject to the exception rule under the agreements. That is, you will be continuously covered by the Japanese social security system and be exempt from coverage under the system of the agreement country.

When you work in both Japan and the agreement country for the same period, you will be covered only by the pension system in the country where your primary place of residence is located. If Japan is your primary place of residence, you will be covered only by the Japanese pension system and exempt from coverage in the other country. If it is in the agreement country, you will be covered only by the pension system of the country.
In case that your primary place of residence is in Japan

NOTE : Again, if you are temporarily sent to the agreement country, you are subject to the rule of temporary detached workers.
Depending on your work and detachment condition, you will be covered by the system as follows:

The above mentioned rules also apply to self-employed persons. If you plan to temporarily work as a self-employed person in an agreement country, you will be continuously covered only by the Japanese system. If you plan to work for more than 5 years in the agreement country, you will be covered only by the agreement country's system. If you are not a self-employed person in Japan currently but you will work as a self-employed person in the agreement country, you will be covered only by the agreement country's system.
Respective agreement provides which system you will be covered by.
Germany/ U.K./ Korea/ U.S./ Belgium/ France/ Canada/ Australia/ Netherlands/ Czech/ Spain/ Ireland/ Brazil/ Switzerland/ Italy
In order for you to be continuously covered only by the Japanese social security system and to be exempt from coverage under the other country's system, you need to satisfy all the following conditions:
* "you continue to be employed by your employer..." means that you provide services to your employer and your employer controls personnel matters and provides labor managements for you.
In order for you to be continuously covered only by the Japanese social security system and exempt from coverage of the system in the agreement country, you need to satisfy all the following conditions:
If you are covered by the Japanese National Pension system (and the Japanese National Health Insurance system), and then you leave Japan - register to the authority that you move your address to an agreement country, you will become no longer subject to coverage of the Japanese National Pension system (and the Japanese National Health Insurance system). Consequently, you need to enroll in the National Pension system voluntarily, in order to qualify for condition 1 above ("You are covered by the Japanese system while you are detached to the agreement country / while you are working in the agreement country").
This treatment is for the Agreements listed below, hence under the other agreements, you will be covered only by the social security system in the agreement country when you transfer your residence to the agreement countries. (NOTE : You are not required to satisfy condition 1 above under the Agreement with Germany.)
with U.K., Korea, U.S., Canada, Australia, Netherlands, Czech, Spain, Ireland, Brazil, Switzerl and and Italy.
Incidentally, the National Health Insurance system does not provide voluntary enrollment plan. However, under the Agreement with the U.S., you are considered to satisfy condition 1 above even if you are not covered by the National Health Insurance system while you work in U.S.
When you need to work in an agreement country exceeding the originally expected work period, your employer in Japan (or if you are a self-employed) may apply for the extension of the exemption.
In principal, you are exempt from coverage under the social security system of each agreement countries for up to 5 years. However, depending on your employer's (or your) specific reason, you may be granted the extension of the exemption in addition to the 5 years. The maximum extension period exceeding 5 years depends on respective agreement.
Germany/ U.K./ Korea/ U.S./ Belgium/ France/ Canada/ Australia/ Netherlands/ Czech/ Spain/ Ireland/ Brazil/ Switzerland/ Italy
If your detachment (or self-employed activity) period exceeds the specified maximum period mentioned above, you will be covered only by the system in the country where you work, according to the basic rule.
If you are permitted to continue to be covered by the Japanese social security system and exempt from the system of the other country during your temporary detachment or self-employed period, your accompanying spouse and child also continue to be covered by the Japanese social security system as an insured person or dependent family members.
On the other hand, your accompanying spouse and child will no longer covered by the Japanese social security system as an insured person or one of your dependent family members if you are locally hired or sent to an agreement country for a long period of time and you are covered by the agreement country's system and exempt from the Japanese system. That is, your spouse becomes ineligible for coverage under the Japanese National Pension system as a category III insured person and the Japanese Employees' Health Insurance system as one of your dependant family members if he/she has been financially supported by your income. And your child who is financially supported by your income becomes ineligible for coverage under the Japanese Employees' Health Insurance system.
In this case, if the registered residence of thespouse or child remains in Japan, he/she needs to enroll in the National Pension system and the National Health Insurance system as an insured person.
And if your spouse or child transfers his/her registered address to the agreement country, he/she can apply for voluntary enrollment inthe Japanese National Pension system (applicable to Japanese citizens aged 20 or over but under 65 who are living overseas). However, the Japanese National Health Insurance system does not have voluntary enrollment plan.
Even if you are sent to an agreement country and subject only to the social security system of the country, you can voluntarily enroll in the National Pension system from the month in which you apply for the enrollment (applicable to Japanese citizens aged 20 or over but under 65 who are living overseas).
If your detachment or self-employment activity started prior to the effective date of each agreement, the effective date is considered to be the date when your detachment or self-employment begins. That is, you will be exempt from coverage under the social security system in the agreement country, if your detachment to the country is expected to be not more than 5 years from the effective date of the agreement.