Continuation After Resignation: Nin-i Keizoku

Nin-i keizoku continuation lets a resigning employee stay on Employees' Health Insurance for up to 2 years after leaving a job.¹² The trade is simple: the same insurer and benefits, but the full premium comes from the leaver's pocket. This guide compares that price against National Health Insurance (NHI), then walks through the 20-day filing and the payment setup.

Confirm current details with official sources

Procedures, fees, and requirements can change. Confirm current details at the Japan Health Insurance Association (Kyokai Kenpo) site and your municipal ward office. This article is general information, not individualized insurance advice; for your specific case, consult a licensed social insurance labor consultant (shakai hoken romushi).

Overview

Japan requires every resident to hold public health coverage without a gap, and resignation forces a choice among three paths.¹² The 任意継続 (nin-i keizoku, "voluntary continuation") path keeps the prior employer-plan coverage in place for up to 2 years at full cost.¹ The alternatives are 国民健康保険 (kokumin kenkō hoken, "National Health Insurance, NHI") at the ward or city office, or becoming a 被扶養者 (hi-fuyōsha, "dependent") under a family member's plan.¹²

This article covers the Kyokai Kenpo version of the procedure, which is the default for employees of firms without their own health insurance society. Society members follow the same statutory frame but file with their own society, whose forms and premium tables differ.¹² Premium rates differ by Kyokai Kenpo prefectural branch, and NHI premiums differ by municipality, so every figure below needs a local check before deciding (as of 2026-09-07).¹³⁴

Who this option is for

Resigning employees who stay resident in Japan and must pick their next insurer before the old coverage lapses.² It also fits workers whose hours drop below the insured threshold and who lose insured status the same way.² Readers moving straight into a new insured job generally skip this option and transfer coverage instead.

How Nin-i Keizoku Works

Continuation keeps the medical side familiar while changing who pays. The clinic copay share stays exactly as during employment.¹ In principle the same benefits continue, with one sharp exception for new income-replacement claims (see below).¹²

During employment the company paid roughly half the health premium. From the loss date the individual pays the entire amount, which is why Kyokai Kenpo describes the premium as doubling from the deducted figure (subject to the cap and branch-rate notes below).¹³ Dependents add no extra premium, which matters for households sizing up the NHI alternative.²

New sickness and maternity allowance claims cannot start during the continuation period. Only cases already being paid continuously from the employment period carry over into continuation.¹² Anyone planning a leave claim around the resignation date should confirm the continuity requirement with the branch first.

What stays the same and what changes

What stays: the insurer network, the copay ratio at clinics, and most cash benefits at the same levels as employment.¹ What changes: the premium payer (the leaver pays all of it), the filing counter (the branch, not the employer), and the payment method (slips or bank transfer, not payroll deduction).¹³⁵

Paid continuation premiums count in full as a social insurance premium deduction at tax filing. Keep the receipts, since reissues are not available; monthly account-transfer payers receive a single certificate in mid-December instead of monthly slips.³

Element	During employment	Under nin-i keizoku	Source
Premium payer	Employer and employee split	Individual pays all	13
Clinic copay share	Standard share	Same share	1
Dependent surcharge	None	None	2
New sickness or maternity allowance	Available	Not paid	12

Eligibility conditions

Two conditions must both hold. First, the insured period must run continuously for 2 months or more up to the day before the loss date.¹⁶ Second, the qualification application must reach the insurer within 20 days from the loss date.¹⁶

The 2-month clock does not require staying with the final employer. Continuous Kyokai Kenpo plus health insurance society periods with not even one day of gap qualify, while prior continuation periods and mutual-aid association periods do not count.⁶ The loss date is normally the day after the retirement date, and continuation qualification starts on that same date.⁷

If the 20th day lands on a weekend or holiday, the deadline shifts to the next business day. Mailed filings must arrive within the window rather than merely being posted, and electronic filing is available as the safer route.¹⁶

Count the 20 days from the day after retirement

The clock starts on the loss date, not on the last working day or the payday. A Friday resignation with a slow post office can burn a week before the form even moves.¹⁶

Nin-i Keizoku vs NHI: The Cost Comparison

This comparison is the decision the Kyokai Kenpo page itself instructs readers to make: weigh the monthly amounts, then file with the chosen insurer.¹² The two prices come from different bases, so the cheaper side flips with income and household shape.

The continuation premium equals the retirement-time 標準報酬月額 (hyōjun hōshū gekkaku, "standard monthly remuneration") multiplied by the residence-prefecture rate including the child-rearing support rate (as of 2026-09-07; confirm current figures with the Kyokai Kenpo branch).¹³ Holders aged 40 to under 65 add the long-term-care rate on top (as of 2026-09-07).¹³ Where the retirement-time figure exceeded 320,000 yen, the math uses 320,000 yen instead (as of 2026-09-07).¹³

NHI works differently. Premiums are set per household from the prior year's income plus headcount, and the household head carries the payment duty (as of 2026-09-07; confirm current figures with the ward office).⁴ Members pay from the enrollment month through the month before withdrawal (as of 2026-09-07).⁴ Calculation methods and reduction programs differ by municipality, so the ward NHI counter gives the only exact comparator (as of 2026-09-07).¹²⁴

Feature	Nin-i keizoku	NHI	Source
Price base	Retirement-time standard remuneration	Prior-year income plus headcount	24
Movement over 2 years	Flat in principle	Re-priced yearly as income history changes	34
Dependent cost	No added premium	Per-head portion per member	24
Reductions	None (prepayment discount only)	Municipal reduction and exemption system	28
Rate geography	Prefectural branch rate	Municipal rate	14

In principle the continuation premium stays flat for the full 2 years (as of 2026-09-07).¹³ It still moves when the holder turns 40 or 65 (care-rate on or off), when prefectural, care, or child-rearing rates change, when the remuneration cap changes, or when the holder moves to a different-rate prefecture (as of 2026-09-07).¹³ Premiums run in whole months with no daily pro-rating: joining mid-month still costs a full month, while the loss month costs nothing unless qualification and loss fall in the same month (as of 2026-09-07).³

How each premium is set

Request both personal quotes before choosing: the branch table figure for continuation and the ward estimate for NHI.¹³⁴ A Tokyo-quoted blog comparison does not transfer to another prefecture or city, because both sides of the equation move at administrative borders.¹³⁴ Self-employed side income, the number of non-earning dependents, and the exact resignation month all tilt the answer.

Worked comparison pattern

The classic pattern runs like this. A high-income resident resigning mid-year often finds continuation cheaper in year 1, because NHI still prices off the high prior-year income while continuation prices off the capped salary figure.²⁴ In year 2 the comparison commonly reverses, because NHI then prices off the lower post-resignation income while continuation holds its flat amount.²⁴

Households with several non-earning dependents tilt further toward continuation, since continuation adds no dependent premium while NHI charges per head.²⁴ Single-person households with a steep income drop tilt the other way in year 2. Treat this as an illustrative pattern and get both personal quotes; no official source publishes a worked example with fixed yen amounts.²⁴

Application Procedure

File fast and file with the right counter. The form is the 健康保険任意継続被保険者資格取得申出書 (kenkō hoken nin-i keizoku hihokensha shikaku shutoku mōshidesho, "voluntary-continuation qualification application"), submitted to the Kyokai Kenpo branch covering the residential address.¹⁹¹⁰ Health insurance society members submit to their own society instead of any branch.¹²

Electronic filing, paper submission, and mail are all accepted, but mailed forms must arrive within the 20-day window.⁶⁹ When adding dependents in the same filing, complete the dependent form on page 2 and attach livelihood-maintenance proof where the branch requires it.¹⁹ Depending on the dependent's situation that means an income or tax-exemption certificate, pay slips or withholding records, recent tax returns, separation slips, or pension notices.⁹

Dependent scope is broad: direct ascendants, a spouse including a de facto partner, children, grandchildren, and siblings qualify without a cohabitation requirement, while more distant relatives within the third degree generally need to share the household.⁹ The income test caps the dependent's yearly income below 1.3M yen, below 1.8M for age 60 plus or disability pensioners, and below 1.5M for ages 19 to under 23 excluding a spouse, while also staying under half the insured person's income (as of 2026-09-07; confirm current figures with the Kyokai Kenpo branch).⁹ Separate-household dependents must additionally earn less than the remittance they receive (as of 2026-09-07).⁹

Processing waits on the employer's loss report reaching the branch through the pension service, with the qualification notice taking roughly 2 weeks to arrive.⁹ Attaching employer-certified retirement-date proof lets the branch proceed without waiting for that feed.⁹ Coverage itself starts on the day after retirement even before the notice arrives, and any interim full self-pay at a clinic can be reclaimed through a medical-expense claim.⁹

Where and when to file

The destination is the branch for the address of residence, not the branch of the former employer, and a move to a different-rate prefecture reprices the premium.¹³ Keep a copy of everything submitted, plus proof of the arrival date for mailed filings. The qualification notice and later the loss notice both matter for the next insurer, so store them with the premium receipts.³¹¹

Payment methods and schedule

Three methods exist: monthly slips, advance prepayment by slip, and monthly account transfer (as of 2026-09-07).⁵ Monthly slips arrive at the start of the month and fall due on the 10th, shifting to the next business day on weekends and holidays, payable at banks or convenience stores within slip-back limits (as of 2026-09-07).⁵ The first billing can bundle 2 or more months depending on processing timing, so check the purpose-months and deadline printed on each slip.⁵

Prepayment buys 6 months (April to September, or October to next March) or 12 months (April to next March) in one transfer (as of 2026-09-07).¹⁸ Mid-year joiners prepay from the month after qualification through September or March (as of 2026-09-07).¹⁸ Prepaid amounts earn a discount of annual 4 percent by the compound present value method and must go by slip rather than account transfer (as of 2026-09-07).⁸ The prepayment deadline is the end of the month before the covered block starts; missing it simply reverts the payer to monthly slips (as of 2026-09-07).⁸

Method	Rhythm	Key rule	Source
Monthly slip	Due the 10th each month	Weekend or holiday shifts to next business day	5
Prepayment	6 or 12 months ahead	Slip only, with annual 4 percent discount	8
Account transfer	Monthly auto-debit	No prepayment by transfer	8

One payment ceiling catches people out: convenience stores cap a single payment at 300,000 yen, so a 12-month prepayment above that line must go through a bank (as of 2026-09-07).⁵ Bank ATMs cap cash payments at 100,000 yen with ID checks above that at the counter (as of 2026-09-07).⁵

Prepay when the 2-year choice is already settled

Prepayment cuts the total by the annual 4 percent discount and removes eleven monthly deadlines that could each end the qualification if missed.⁸ Mid-year joiners should ask the branch whether the first prepayment window still fits before counting on it.⁸

Duration, End Conditions, and After

Continuation runs 2 years from the qualification date.¹⁷ No expiry procedure is needed at the end; a loss notice arrives and any held cards go back.¹¹ The months after a mid-prepayment loss for re-employment, late-stage elderly entry, voluntary withdrawal, or death are refunded, while other prepayment exits are not.⁸ Premiums already paid past the loss month come back through a mailed claim form, except that same-month qualification and loss still charges that month.¹¹

How continuation ends early

Five triggers cut the period short: taking a new insured job, missing a payment deadline, entering the 後期高齢者医療制度 (kōki kōreisha iryō seido, "late-stage elderly medical system") at 75, death, or filing a voluntary withdrawal notice.¹¹¹ Re-employment and age-75 cases file a loss application with any held cards attached, and dependents need their own next-coverage filing at that point.¹¹

A single missed deadline ends the qualification

A monthly payment missed past its due date ends the qualification on the next day, and a missed first payment voids it outright. Only insurer-accepted force-majeure delay is excused, and care received under lapsed qualification must be repaid in full.⁵¹¹ A lost slip is an emergency: contact the branch before the deadline rather than after.⁵

What comes after

After expiry or payment-lapse loss, the next coverage is NHI at the municipal counter or a family member's dependent slot.¹¹ Keep the continuation loss notice, because the next insurer may ask for it as the date proof.¹¹ NHI enrollment filing is due within 14 days of the qualifying event, with the loss certificate as the standard proof.⁴

Good to know

File within 20 days even before the loss certificate arrives

The 20-day clock runs from the day after retirement no matter how slow the paperwork chain is.¹⁶ Electronic filing or early posting plus employer-certified retirement-date proof beats waiting for the perfect document set.⁶⁹ A mailed form that arrives on day 21 is late even if it was posted on day 15.¹⁶

Missing one payment can end continuation without reinstatement

There is no grace-month concept here. The qualification ends the day after a missed monthly deadline, and the branch sends the loss notice around the 20th of that month after confirming the payment data.⁵¹¹ Prepayment exists largely to take this risk off the table for readers who know they will stay the full term.⁸

The 2-year clock does not reset with a brief rejoin

Prior continuation periods do not count toward a fresh 2-month qualifying tenure, so a short re-employment spell followed by another resignation cannot be assumed to reopen a new 2-year window.⁶ Anyone planning around this edge should confirm the tenure math with the branch before resigning a second time.⁶

NHI quotes vary by municipality, so compare against your own ward figure

Branch premium tables differ by prefecture and NHI arithmetic differs by city, which makes internet-wide yen comparisons unreliable (as of 2026-09-07).¹³⁴ Pull the branch table for the address of residence and the ward NHI estimate for the same household, then compare those two numbers directly.¹⁴

New sickness or maternity claims do not start during continuation

This surprises readers who remember these allowances as employee benefits. Cases already being paid continuously from the employment period carry over, but conditions arising fresh during continuation do not qualify.¹² Childbirth lump-sum and other standard benefits continue under the normal rules.¹

See also

• Who Enrolls in National Health Insurance
• What NHI Covers and What's Excluded
• Health Insurance and Pension for Freelancers
• Maternity, Paternity, and Childcare Leave
• Shakai Hoken Overview
• Health Insurance When Changing Jobs in Japan

References

Footnotes

1. Japan Health Insurance Association (Kyokai Kenpo). 「会社を退職するとき 任意継続」 (benefit/voluntary_continuation overview page). https://www.kyoukaikenpo.or.jp/benefit/voluntary_continuation/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵ ↩³⁶ ↩³⁷ ↩³⁸ ↩³⁹ ↩⁴⁰ ↩⁴¹ ↩⁴² ↩⁴³

2. Japan Health Insurance Association (Kyokai Kenpo). 「退職後の健康保険について」 FAQ 001. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/001 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²²

3. Japan Health Insurance Association (Kyokai Kenpo). 「保険料について」 FAQ 005. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/005 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷

4. Shibuya City. "National Health Insurance (NHI) | LIVING IN SHIBUYA" (English). https://www.city.shibuya.tokyo.jp/contents/living-in-shibuya/en/health/insurance.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷

5. Japan Health Insurance Association (Kyokai Kenpo). 「保険料の納付方法について」 FAQ 006. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/006 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

6. Japan Health Insurance Association (Kyokai Kenpo). 「任意継続の加入条件について」 FAQ 002. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/002 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

7. Japan Health Insurance Association (Kyokai Kenpo). 「加入期間について」 FAQ 004. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/004 ↩ ↩²

8. Japan Health Insurance Association (Kyokai Kenpo). 「前納による納付について」 FAQ 007. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/007 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

9. Japan Health Insurance Association (Kyokai Kenpo). 「任意継続の加入手続きについて」 FAQ 003. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/003 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

10. Japan Health Insurance Association (Kyokai Kenpo). 「任意継続の申請書」 index page. https://www.kyoukaikenpo.or.jp/application_form/voluntary_continuation/ ↩

11. Japan Health Insurance Association (Kyokai Kenpo). 「資格の喪失について」 FAQ 009. https://www.kyoukaikenpo.or.jp/faq/voluntary_continuation/009 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹