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Disclaimer
Educational date calculator, not legal advice, not affiliated with the Digital Agency, J-LIS, ISA or any city office. The date printed on your card is what counts; check with your city hall before the deadline.
Rules as of 2026-10-29 from the My Number Card ordinance (総務省令第85号 art. 26, 27, 29), the Digital Agency, ISA (incl. the 2026-06-14 特定在留カード), Mynaportal and city guidance. It only uses the dates you enter; it can't see your card or a pending immigration decision.
What this is
A free educational date calculator. It applies a dated reading (as of 2026-10-29) of the My Number Card ordinance (個人番号カード等に関する命令, 総務省令第85号: art. 26 validity, art. 27 foreign residents, art. 29 renewal window), the Digital Agency's expiry FAQ, the Immigration Services Agency's pages on the 特定在留カード and residence-card renewal, the Mynaportal FAQ on the マイナ保険証 grace period and city guidance (e.g. Matsudo) to the dates you enter.
What it is not
It is not legal advice and is not affiliated with the Digital Agency, J-LIS (Japan Agency for Local Authority Information Systems), the Immigration Services Agency of Japan, the Ministry of Health, Labour and Welfare or any city or ward office. It cannot see your card, your electronic certificates or whether an immigration application is really pending. The date printed on your card, the J-LIS notice and your city office are what count. Documents, fees for new cards and counter hours differ by city. If your card lapses, use another ID and ask your city office; for health insurance, use the 資格確認書 your insurer sends.
How dates are counted
The "10th birthday after the card was made" means the 10th birthday falling after the issue date (a birthday on the issue day itself is not counted). A February 29 birthday counts as February 28 in non-leap years. Renewal opens on the first day fewer than 3 months remain (expiry 2026-10-01 → from 2026-07-02). The 2-month special period ends on the same day two months after the period-of-stay expiry (or the month's last day). The マイナ保険証 grace runs to the end of the 3rd month after the month the e-certificate expired.
Sources
- https://laws.e-gov.go.jp/law/426M60000008085
- https://www.digital.go.jp/en/policies/mynumber/expiration-date
- https://www.digital.go.jp/policies/mynumber/expiration-date
- https://www.moj.go.jp/isa/tokutei.html
- https://www.moj.go.jp/isa/applications/procedures/nyuukokukanri10_00011.html
- https://www.moj.go.jp/isa/10_00270.html
- https://faq.myna.go.jp/faq/show/10178?site_domain=default
- https://www.city.matsudo.chiba.jp/InternationalPortal/en/forforeignresidents/mynumbercard.html
- https://www.mhlw.go.jp/stf/newpage_50657.html
Your data
The dates you enter stay in your browser (or in a share link you create). No login, no names, no card numbers, no database. Never type your My Number (個人番号) into any website like this; it is not needed.