Tarjeta My Number en Japón: Guía 2026 para Residentes Extranjeros

What Is the My Number Card and Why Does Every Foreign Resident Need One?

The My Number Card Japan foreigners guide you actually need — because in 2026, this small plastic card has become one of the most important documents you can carry in Japan. Officially called the Individual Number Card (個人番号カード), it links your 12-digit My Number (マイナンバー) to a government-issued photo ID that proves your identity and residency status.

Every person registered in Japan's resident system — including foreign nationals on mid- to long-term visas — receives a My Number. But having the number is very different from having the card. The card is what unlocks the real benefits.

As of 2026, the My Number Card is no longer just convenient — it is becoming essential. Japan's government has been steadily phasing out the old paper health insurance card, integrating tax filing, banking ID checks, and public services all through this one card. If you arrived in Japan recently or have been putting off the application, now is the time to act.

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How to Apply for the My Number Card: Step-by-Step for Non-Japanese Speakers

The application process is simpler than it sounds, and you can start it entirely in English — or at least with the help of English-language guidance online. Here is how it works from start to finish.

Step 1: Find Your My Number Notification Letter

When you first registered your address at your local ward office (shiyakusho or kuyakusho), a paper notification letter was mailed to you. This letter contains your 12-digit My Number. Keep it safe — you will need it to apply.

If you have lost this letter, visit your local ward office with your Residence Card. They can confirm your number in person.

Step 2: Submit Your Application

You can apply in three ways:

• Online: Go to mynumbercard.kojinbango.go.jp (available in English), upload a photo from your smartphone, and fill in your details. This is the fastest method.
• By postcard: A QR code postcard may have arrived with your notification letter. Scan it to apply from your phone.
• At your ward office: Some offices have dedicated application terminals where staff can help you through the process.

Step 3: Wait for Your Collection Notice

After submitting, you wait approximately 1–2 months for your card to be ready. You will receive a postcard telling you to come and collect it in person.

Step 4: Pick Up Your Card

Bring the following to your ward office:

• Your Residence Card (在留カード)
• Your collection notice postcard
• Your My Number notification letter (if you still have it)

At the counter, you will set four PIN numbers: a 4-digit numeric PIN for daily use, and a 6–16 character alphanumeric password for electronic signatures. Write these down and store them somewhere safe.

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What You Can Actually Do With Your My Number Card in 2026

This is where the card earns its place in your wallet. In 2026, the My Number Card is your gateway to a surprisingly wide range of services.

Tax Filing (確定申告)

If you freelance, have side income, or work as a sole proprietor, you can use your My Number Card to file taxes online via the e-Tax system. No need to queue at the tax office. The card's IC chip authenticates your identity digitally.

Banking and Financial Services

Since 2023, Japanese banks have been required to link customer accounts to My Numbers. Presenting your My Number Card when opening a new bank account at institutions like Japan Post Bank, MUFG, or Rakuten Bank speeds up the process significantly — and is often required for online-only banks.

Convenience Store Certificates

With your card and PIN, you can print official documents — like a copy of your juuminhyo (residence certificate) — at the kiosk machines inside any FamilyMart, Lawson, or 7-Eleven. Available 24/7. This saves multiple trips to the ward office.

Digital Government Services (Myna Portal)

The Myna Portal app connects your card to a personal dashboard where you can check your pension contributions, confirm tax information, apply for childcare support, and soon, update your address when you move — all from your smartphone.

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My Number Card as Your Health Insurance Card: The 2026 Switch Explained

This is the change that affects every single foreign resident in Japan. The traditional green health insurance card (健康保険証) has been officially phased out as of December 2024, and 2026 is the year when nearly all medical institutions are expected to use the My Number Card system exclusively.

Here is what this means in practice: when you visit a clinic or hospital, instead of handing over your green insurance card, you tap your My Number Card on a small IC reader at the reception desk. The system verifies your insurance coverage electronically, in real time.

How to Link Your Health Insurance to Your My Number Card

1. Log in to Myna Portal (available as an app or via browser at myna.go.jp)
2. Select "Health Insurance Card Linkage" (健康保険証利用登録)
3. Use your card's PIN to authenticate
4. Confirm your insurance details appear correctly

If you are enrolled in National Health Insurance (国民健康保険) through your ward office, the linkage is often completed automatically. If you are under employer-managed insurance (社会保険), your employer's HR department may need to register on your behalf.

In 2026, your My Number Card is not just a government ID — it is your health insurance card, your tax filing tool, and your digital identity in Japan, all in one.

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Common Mistakes and Delays Foreign Residents Face (And How to Avoid Them)

The process seems straightforward, but foreigners regularly run into specific problems. Here are the most common ones — and how to sidestep them.

Wrong or Outdated Address

Your My Number Card is tied to the address registered at your ward office. If you move and forget to update your juuminhyo, your collection notice postcard will go to the wrong address. Always update your address within 14 days of moving — this is a legal requirement anyway.

For sharehouse residents, make sure the property manager has registered the building correctly with the ward office so your address appears properly on official documents. At Modern Living Tokyo, we help new residents with this registration step as part of the move-in process.

Photo Rejection

The government has strict photo requirements: plain white or light gray background, no hats, no glasses, face clearly visible, taken within the last six months. Smartphone selfies often get rejected due to poor lighting or background clutter. Use a proper photo booth (証明写真機) found at most major train stations — they cost around ¥700–¥900 and produce ID-standard photos automatically.

Forgetting Your PIN

If you forget your PIN, you cannot use the card. You will need to visit your ward office in person with your Residence Card to reset it. It is a simple process, but it takes time. Store your PINs somewhere secure — a password manager works well.

Not Renewing on Time

The My Number Card itself is valid for 10 years for Japanese nationals, but for foreign residents, it expires when your Residence Card expires. When you renew your visa and get a new Residence Card, visit your ward office to update your My Number Card as well.

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Where to Keep Your My Number Card Safe — and What to Do If You Lose It

Your My Number Card contains an IC chip with sensitive personal data. Treat it like a bank card or passport.

Everyday Storage Tips

• Store it in a dedicated card sleeve or wallet — IC chips can be damaged by bending or extreme heat.
• Do not keep it loose in a bag pocket. The IC chip can be inadvertently scanned.
• Consider an RFID-blocking card sleeve if you are concerned about digital skimming.
• You do not need to carry it daily — only bring it when you specifically need it (hospital visits, tax filing, etc.).

If You Lose Your Card

Act quickly. Call the My Number Card Suspension Hotline at 0120-95-0178 (available 24 hours, 365 days a year). They will suspend your card immediately to prevent misuse.

Then, visit your ward office to apply for a replacement. You will need your Residence Card and your My Number (which can be confirmed at the office). A replacement card is issued free of charge the first time.

Note that your My Number itself never changes, even if the card is replaced. The 12-digit number stays with you for your entire time as a Japan resident.

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Getting Started: Your My Number Card Action Plan

If you do not yet have your My Number Card, here is your simple action plan:

1. Find your My Number notification letter (or visit your ward office to confirm your number)
2. Apply online at mynumbercard.kojinbango.go.jp or at your nearest ward office terminal
3. Wait 1–2 months and collect your card when the notice arrives
4. Link your health insurance through Myna Portal
5. Set up the Myna Portal app on your smartphone for ongoing access to government services

Living in Tokyo as a foreign resident comes with a learning curve, but the My Number Card is genuinely one system that, once set up, makes daily life easier. From hospital visits to tax filing, it is the single most useful piece of ID you will own in Japan.

If you are just arriving in Tokyo and getting settled, Modern Living Tokyo's furnished apartments and sharehouses include move-in support that covers address registration at your ward office — the essential first step before you can apply for your My Number Card. Getting the paperwork right from day one makes everything smoother down the line.