How to Organize Important Documents
as a Foreigner in Japan

Most people back home manage a handful of important documents. A passport, a national ID, maybe a driving license. Living in Japan as a foreigner is different. Within your first few months, you accumulate a stack of cards, booklets, and certificates that each serve a specific legal or administrative purpose.

Lose any one of them -- or simply not know where it is when you need it -- and you're looking at a time-consuming visit to a ward office, a hospital, or an immigration bureau. None of those are places you want to spend your afternoon trying to fix something preventable.

Why it matters more in Japan

Japan runs on paperwork. Many procedures that are handled digitally elsewhere -- registering a new address, signing up for a service, renewing a contract -- require you to show up in person with specific documents in hand. If you arrive without the right one, you typically have to come back another day.

As a foreigner, the stakes are higher. Your residence card is a legal requirement to carry at all times. Your My Number is required for everything from employment to taxes to opening a bank account. Letting these expire or misplacing them doesn't just cause inconvenience -- it can create real problems with your status or your employer.

Residence card (Zairyu card)

Your Zairyu card (在留カード) is the most important document you carry in Japan. It proves your legal status, your visa type, and your permitted period of stay. You are legally required to carry it with you at all times and to present it when asked by police or immigration officers.

The card needs to be renewed when your residence status changes and when you renew your visa. Forgetting to renew it on time is a serious mistake -- overstaying your permitted period has consequences for future visa applications.

Keep a photo of the front and back of your current card. Note the expiry date somewhere you will actually see it -- not just in the back of a drawer. When you move to a new address, you have 14 days to update the address on the card at your local ward office.

My Number card (Maina card)

Your My Number (マイナンバー) is Japan's national identification number, assigned to every resident including foreigners. It appears on a paper notification letter and, if you apply for one, on a physical My Number card (Maina card).

You need your My Number for: employment paperwork, filing taxes, enrolling in national health insurance, opening certain bank accounts, and applying for various government services. Many employers request it during onboarding.

The My Number card doubles as a photo ID in most situations where you would otherwise need to show your residence card. It is worth applying for if you haven't yet -- the process takes a few weeks but simplifies a lot of future paperwork. Store a copy of both the notification letter and the card itself.

Health insurance card (Hoken-sho)

Japan's universal health insurance system covers foreigners who are residents. If you are employed, you are enrolled through your company's shakai hoken (社会保険). If you are self-employed or between jobs, you enroll in kokumin kenko hoken (国民健康保険) through your ward office.

Your insurance card is what you present at every hospital, clinic, and pharmacy. Without it, you pay the full cost upfront. Losing it means a trip to your ward office or HR department to get a replacement -- manageable, but worth avoiding.

The card changes when you change jobs or when you move between insurance types. Keep a photo of your current card and make a note of the enrollment date and the organization that issued it.

Pension book (Nenkin Techo)

Your pension book (年金手帳) records your contributions to Japan's pension system. If you are employed, your company handles enrollment and contributions on your behalf. If you are self-employed, you manage this yourself through the ward office.

The book itself is a small orange booklet. It rarely gets used on a day-to-day basis, which makes it one of the most commonly misplaced documents among foreigners. You will need it when changing jobs, when applying for a lump-sum withdrawal if you leave Japan, and when dealing with any pension-related administration.

Store it somewhere fixed and photograph the key pages -- particularly the page showing your basic pension number. This number is what matters for administrative purposes.

Home country documents

Living abroad means maintaining documents in two countries simultaneously. For Indians in Japan, the key ones are:

Passport expiry is the one that catches people most off guard. Your visa is stamped in your passport. When you get a new passport, you need to visit the immigration bureau to have your residence status transferred -- it does not happen automatically.

Bank and lease documents

Opening a bank account in Japan as a foreigner requires your residence card, My Number, and in some cases a registered seal (hanko). Keep a record of your bank name, branch, and account number somewhere other than just the bankbook -- if the bankbook gets lost, you'll be glad you have this.

Your lease agreement (chintai keiyakusho) is a document most renters tuck away and never look at again. But it contains important information: your contract renewal dates, deposit amounts, what happens if you break the lease early, and your guarantor's details. Many leases auto-renew but require action at certain points. Knowing when those points are prevents unexpected fees.

Also worth keeping organized: your inkan (registered seal) registration certificate if you have one, your residence certificate (juminhyo) from the ward office, and any guarantor agreements.

A system that works

The documents above fall into two categories: things you need regularly (residence card, health insurance card, My Number card) and things you need occasionally but urgently (pension book, lease, degree certificates).

For things you carry: keep physical cards in one wallet or card holder. Never leave them in different places. Take a photo of the front and back of each one and store it securely -- if a card is lost or stolen, you'll need those details to report it and get a replacement.

For things you store: pick one physical location and keep everything there. A single folder or file box at home. Photograph the key pages of everything in it. When you need to find something, you search the photos -- you don't dig through the folder under time pressure.

Once Kept is built for exactly this. Photograph a card or document, tag it with a name and location, and it becomes searchable in seconds. When the ward office asks for your My Number or your employer asks for your pension book number, you open the app and it's there.