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Keep Kyokai Kenpo After You Quit
Fast checklist for keeping Kyokai Kenpo after quitting in Japan, with the 20-day deadline, filing route, payment rules, and bad-fit signs.
Do not miss the filing window: your optional continuation application must reach your Kyokai Kenpo branch within 20 days from the day after resignation, and mailed applications must arrive by that deadline, not just be postmarked. (kyoukaikenpo.or.jp)
Part of our How to Get Back on Health Insurance After Quitting in Japan in 2026 Before the 14-Day Deadline Hits guide.
Eligibility and the 20-day deadline
- You can use Kyokai Kenpo optional continuation only if you had at least 2 continuous months of insured status before losing coverage. (kyoukaikenpo.or.jp)
- The deadline is 20 days from the day after your resignation. If day 20 falls on a weekend or holiday, the next business day applies. (kyoukaikenpo.or.jp)
- Paper applications go to the Kyokai Kenpo branch for your current prefecture of residence. Use the official branch directory for each branch address and phone number; branch phone and counter hours are generally Monday to Friday, 8:30-17:15, excluding national holidays and December 29 to January 3. (kyoukaikenpo.or.jp)
- If you miss the 20-day window, relief is limited. Kyokai Kenpo has a separate delay-reason form for unavoidable situations, not as a normal extension. (kyoukaikenpo.or.jp)
| Quick check | What to confirm now |
|---|---|
| Deadline | Count 20 days from the day after your last day at work, then make sure the application reaches Kyokai Kenpo in time. (kyoukaikenpo.or.jp) |
| Where to apply | Your residential prefecture's branch, not your former company. The official branch directory lists addresses and phone numbers. (kyoukaikenpo.or.jp) |
| Counter hours | Weekdays 8:30-17:15, excluding national holidays and Dec 29-Jan 3. (kyoukaikenpo.or.jp) |
Application steps documents and submission route
- Open the official Optional Continuation Acquisition Application. You can file by mail or through Kyokai Kenpo's electronic application service; the online service for these procedures started on January 13, 2026. (kyoukaikenpo.or.jp)
- Fill in your own details first, then add dependents if needed. When you add dependents, Kyokai Kenpo may require proof of income, family relationship, co-residence, or remittances depending on the case. (kyoukaikenpo.or.jp)
- If you want faster processing, attach proof of your retirement date if you have it, such as a retirement certificate or a copy of your employment insurance separation notice. Without retirement-date proof, Kyokai Kenpo can still accept the filing, but processing may wait until it receives the loss record from the Japan Pension Service. (kyoukaikenpo.or.jp)
- Submit early if you are mailing it. A day-19 post office drop is risky because the deadline is based on arrival. (kyoukaikenpo.or.jp)
| Document | Usually needed |
|---|---|
| Acquisition application | Always. Use the official form or the online service. (kyoukaikenpo.or.jp) |
| Dependent documents | Only if you list family members; exact proof depends on income, relationship, and living arrangement. (kyoukaikenpo.or.jp) |
| Retirement-date proof | Recommended if you have it, because it can speed up issuance. (kyoukaikenpo.or.jp) |
Premium payment rules cancellation triggers and best-use cases
| Rule | Quick reference |
|---|---|
| How premiums are set | You pay the full premium yourself. It is based on the lower of your old standard monthly remuneration or the FY2026 cap of ¥320,000, using your current prefecture's rate. In 2026, the average health insurance rate is 9.90%, the child and childcare support rate is 0.23% for optional continuation from April 2026, and the long-term care rate for ages 40-64 is 1.62%. Check the official 2026 premium page for your prefecture. (kyoukaikenpo.or.jp) |
| Rough 2026 ceiling estimate | At the ¥320,000 cap, a national-average estimate is about ¥32,416 per month before long-term care, or about ¥37,600 if you are age 40-64 and the 1.62% care rate applies. Your actual prefectural amount can be higher or lower. (kyoukaikenpo.or.jp) |
| When to pay | After the first invoice, monthly slip payments are due by the 10th of each month. The first premium uses a Kyokai Kenpo-set due date, so read that first invoice carefully. Auto-debit is available, usually starts after 2-3 months, and then withdraws on the 1st business day; until then, pay by slip. (kyoukaikenpo.or.jp) |
| What happens if you miss a payment | If you miss a regular monthly deadline, you lose eligibility the next day. If you miss the first premium without a valid reason, the optional continuation acquisition is canceled. (kyoukaikenpo.or.jp) |
| How coverage ends | Coverage ends after 2 years, on nonpayment, when you join another employee plan, when you enter the late-elderly system, on death, or if you file to leave voluntarily. If you leave voluntarily, the loss date is the first day of the month after Kyokai Kenpo accepts your request, not any date you choose. (kyoukaikenpo.or.jp) |
- Usually a good fit: you cannot join a family member's plan, and your city hall's National Health Insurance quote is higher. In practice, this often works well when you have eligible dependents because the optional continuation premium is tied to your remuneration rather than household size; that is an inference from the official formulas, so compare both quotes before deciding. (kyoukaikenpo.or.jp)
- Usually a bad fit: you can join a family member's health insurance as a dependent, because that route has no separate dependent premium; or your municipality quotes a lower National Health Insurance amount; or your income dropped sharply after quitting and the old-remuneration-based premium now feels too expensive. (kyoukaikenpo.or.jp)
Use LO-PAL to keep your insurance deadlines and forms straight, then Back to full guide.
この記事のライター
Taku Kanaya
LO-PAL 創業者
厚生労働省支援の外国人患者受入れ医療コーディネーター、法務の専門家。自らの海外生活経験と医療現場での知見をもとにLO-PALを設立。
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