Social Security Agreements Between Japan and Other Countries: A Complete Guide for Foreigners

If you're working in Japan as a foreigner, one of the most important—and often overlooked—financial topics is Japan's social security agreements with other countries. These bilateral agreements can save you from paying double social security contributions, help you qualify for pension benefits in both countries, and protect years of contributions you've already made. This guide covers everything you need to know about Japan's social security agreements, which countries are included, how to claim benefits, and what steps to take.

What Are Social Security Agreements?

Social security agreements (also called totalization agreements) are bilateral treaties between Japan and other countries designed to solve two major problems that arise when workers move between countries:

1. Double contributions: Without an agreement, a foreign worker in Japan could be forced to pay social security taxes in both Japan and their home country simultaneously—even for the same employment period.
2. Lost pension credits: Workers who split their career between two countries often fail to accumulate enough contribution years in either country to qualify for pension benefits.

Japan's agreements address both issues by coordinating which country's system applies to a given worker and by allowing contribution periods to be combined ("totalized") when determining pension eligibility.

Japan signed its first social security agreement with Germany in 2000. Since then, the network has expanded steadily. Italy became the most recent addition, joining on April 1, 2024. As of 2024, Japan has concluded social security agreements with more than 23 countries across Europe, North America, Asia, and Oceania.

For more background on Japan's overall social insurance system, see our guide to working in Japan as a foreigner and the healthcare system in Japan.

Which Countries Have Social Security Agreements with Japan?

The following table lists the countries that currently have a social security agreement in force with Japan, along with the type of coverage the agreement provides:

Countries marked "Pension + Health Insurance" allow you to be exempt from both components of Japan's social insurance during short-term postings. Countries marked "Pension only" allow exemption from Japan's Employees' Pension Insurance, but employees still typically need to enroll in Japan's health insurance system.

Always verify current status with the Japan Pension Service or your company's HR department, as agreements can be updated.

How Do Social Security Agreements Work in Practice?

The agreements generally operate through two main mechanisms:

1. Coordination of Applicable Legislation (Exemption from Double Coverage)

If you are sent to Japan by your employer as a secondee or temporary assignee, you will normally remain covered only by your home country's social security system—provided your posting is expected to last 5 years or less. During this period, you do not need to enroll in Japan's Employees' Pension Insurance or, in many cases, Japan's health insurance either.

This rule prevents both you and your employer from paying contributions to two systems simultaneously. The 5-year threshold is the standard, but the exact rules vary by country—some agreements set different limits or allow extensions.

2. Totalization of Coverage Periods (Combining Pension Credits)

If you have worked in both Japan and a country with which Japan has a totalization agreement, you may be able to combine your contribution periods from both countries to meet the minimum qualifying period for pension benefits.

For example, under the U.S.-Japan agreement (effective October 1, 2005), a person who worked in the U.S. for 6 years and in Japan for 4 years might not qualify for full pension benefits in either country on their own. The totalization agreement allows the combined 10-year period to be counted, potentially making that person eligible for a pro-rata benefit from Japan and a U.S. benefit calculated on their actual U.S. contributions.

For details on how this interacts with your overall tax situation, see our complete guide to taxes in Japan for foreigners.

Certificate of Coverage: What It Is and How to Get One

If you are a foreign national temporarily assigned to Japan under one of these agreements, your employer should obtain a Certificate of Coverage on your behalf. This document proves that you are exempt from Japan's social security system because you are already covered under your home country's system.

Why it matters: Without a Certificate of Coverage, your employer in Japan may be required to enroll you in Japan's social insurance by default, resulting in mandatory contributions to both systems.

How to get one:

• For workers coming to Japan from abroad: Apply to the social security authority in your home country before or shortly after your Japan assignment begins. In the U.S., this would be the Social Security Administration (SSA); in the UK, it would be HMRC.
• For Japanese workers going abroad: Apply to the Japan Pension Service or the relevant local pension office in Japan.
• The certificate is typically issued for the duration of the posting (up to 5 years) and can sometimes be renewed.

Once issued, the Certificate of Coverage is submitted to the employer and the relevant Japanese social insurance office to confirm your exemption.

The U.S.-Japan Totalization Agreement in Detail

The U.S.-Japan agreement is one of the most commonly referenced, given the large number of American expats and Japanese nationals working between the two countries. Here are the key points:

• Effective date: October 1, 2005
• Administered by: Social Security Administration (U.S.) and Japan Pension Service
• Coverage: Pension (retirement, disability, survivors)—not health insurance

Under the agreement, if you work in the U.S., you pay U.S. Social Security taxes but not Japanese pension contributions. If you work in Japan, you pay Japanese pension contributions but not U.S. Social Security taxes. If you have credits in both systems, they can be combined to help you qualify for benefits.

Applying for U.S. Social Security benefits from Japan:

1. Contact the nearest Japan Pension Service office (Nihon Nenkin Kikou) for an initial interview
2. The Japan Pension Service forwards your case to the U.S. Social Security Administration
3. A U.S. representative contacts you to process the claim
4. You receive a benefits notification within approximately 3 months

Applying for Japanese pension benefits from abroad:

1. File the application at the competent institution in your home country using designated forms
2. You can also apply directly at the Japan Pension Service if you are still in Japan

For authoritative U.S. guidance, visit the Social Security Administration's Japan agreement page. The U.S. Embassy in Japan also provides assistance through its Federal Benefits Unit.

Lump-Sum Withdrawal Payment: Getting Your Contributions Back

If you contributed to Japan's pension system and then leave Japan permanently without qualifying for a pension, you may be eligible for a lump-sum withdrawal payment (脱退一時金, Dattai Ichiji-kin).

Key conditions:

• You must have contributed to Japan's Employees' Pension Insurance for at least 6 months
• You must not hold Japanese citizenship
• You must have left Japan and not have an address in Japan at the time of application
• You must apply within 2 years of leaving Japan
• You must not be eligible to receive Japanese pension benefits

The payment amount is calculated based on the average standard monthly remuneration and the number of months contributed. Note: If Japan has a totalization agreement with your home country and you use totalization to qualify for a Japanese pension, you cannot receive the lump-sum withdrawal at the same time.

If your home country has an agreement with Japan that covers the totalization of periods, it may be more financially advantageous to use totalization rather than take the lump sum—consult a financial advisor or the Japan Pension Service before deciding.

How to Check Your Pension Contributions in Japan

The Japan Pension Service maintains records of all contributions. Foreign residents can:

• Check online via the My Number (マイナンバー) portal at mynaportal.go.jp
• Visit a pension branch office with your Basic Pension Number (Kiso Nenkin Bangou) card or My Number card
• Call the Nenkin Dial at 0570-05-1165 (Japanese/English support available)

Your Basic Pension Number is issued when you first enroll in Japan's pension system. Keep this number safe—it's needed for all pension-related procedures, including international agreement applications.

For broader context on managing your finances in Japan, our banking and finance guide for foreigners in Japan covers related topics.

Practical Tips for Foreigners Working Under a Social Security Agreement

Before your Japan assignment starts:

• Confirm whether your home country has an agreement with Japan and what type (pension only vs. pension + health insurance)
• Ask your employer to obtain a Certificate of Coverage before your posting begins
• Keep copies of all social security documentation from both countries

During your Japan posting:

• If your assignment extends beyond the agreed period (usually 5 years), notify both your employer and the relevant pension offices—you may need to transition to Japan's system
• If you do enroll in Japan's pension system, keep track of your Basic Pension Number and contribution records

When leaving Japan:

• Decide whether to apply for the lump-sum withdrawal payment or use totalization
• If applicable, file for pension benefits in both countries using the totalization agreement provisions
• Apply for any refund within 2 years of leaving Japan

Ongoing:

• Keep your home country's social security authority updated on your work history abroad
• For complex cross-border pension situations, consider consulting a specialist in international social security or a tax professional

Resources like Living in Nihon and For Work in Japan offer practical guides for foreigners navigating life and employment in Japan. Ittenshoku also covers career-related topics for those transferring or relocating within Japan and internationally.

Frequently Asked Questions

Q: Does the social security agreement affect my health insurance in Japan? A: It depends on your home country. Some agreements (e.g., Germany, France, Belgium) exempt you from both pension and health insurance. Others (e.g., U.S., UK, Canada) only exempt you from pension insurance, so you still need to enroll in Japan's health insurance.

Q: What if my home country is not on the list? A: If there is no agreement, you are required to enroll in Japan's social security system (pension and health insurance) like any other employee. You may also be contributing to your home country's system simultaneously. Check your home country's tax treaty situation with Japan separately.

Q: Can I claim social security benefits from both Japan and my home country? A: Yes, but only if you have enough qualifying periods in each system independently, or if you use totalization to meet the minimum period. The benefits from each country are calculated based on the actual contributions made in that country—you don't receive the full benefit from both.

Q: Who should I contact for help? A: Contact the Japan Pension Service (nenkin.go.jp) for Japan-side inquiries, or the social security authority in your home country for their side. The Ministry of Health, Labour and Welfare also provides English-language information at mhlw.go.jp.

Understanding Japan's social security agreements takes some effort, but the financial stakes—potentially years of pension contributions and thousands of dollars in savings—make it worthwhile. Whether you're a short-term assignee looking to avoid double contributions or a long-term resident planning for retirement, these agreements exist to protect your interests. Take the time to verify your country's agreement status, secure the right certificates, and plan your pension strategy before, during, and after your time in Japan.

For more on life in Japan as a foreigner, explore our complete guide to daily life in Japan and moving to Japan guide.