Pension Splitting in Japan Divorce: 2-Year Deadline & 50% Rule

• 2-year deadline is absolute. You must file the *Standardized Remuneration Adjustment Request* (標準報酬改定請求書) within 2 years from the day after divorce becomes final (Employee Pension Act Art. 78-2(2), 78-14). Miss it and you lose the right permanently — even if your spouse agrees later.
• Courts default to 50/50. Family courts in Japan virtually always set the split ratio at the statutory maximum of 0.5 (50%) under Agreed Division, regardless of which spouse earned more (established case law since 2007).
• Category 3 Division is automatic. If you were a dependent spouse (第3号被保険者, typically a homemaker) on or after April 1, 2008, you can file unilaterally — no spousal consent required (Art. 78-14).
• Only Employee Pension (厚生年金) proportional benefits are split. National Pension basic benefit (国民年金基礎年金), corporate pensions (DB/DC), iDeCo, and private insurance annuities are NOT subject to division.
• Foreign spouses qualify. Pension splitting rights are based on registration as an insured person under the Japanese system, not nationality. Non-Japanese spouses who paid into Employee Pension (or were registered as Category 3) can claim.
• No immediate payout. Splitting adjusts the *future* pension amount — payments begin only when the receiving spouse reaches pension eligibility (typically age 65).

Strategic note: A homemaker spouse covering periods both before AND after April 2008 should usually file both — Agreed Division for pre-2008 marriage years (negotiating up to 50%), Category 3 Division for post-2008 years (automatic 50%). The two routes are not mutually exclusive.

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Japan's pension division system splits Employee Pension records accumulated during marriage upon divorce. Under Agreed Division (Employee Pension Act Art. 78-2), spouses determine the split ratio by mutual agreement (recorded in a notarized divorce settlement) or by family court decision (調停 mediation or 審判 adjudication). The statutory maximum is 0.5 (50%), and courts have established a consistent practice of granting the maximum ratio unless extraordinary circumstances exist.

Under Category 3 Division (Art. 78-14), enacted in 2007 and effective for periods after April 2008, the dependent spouse can unilaterally file with the Japan Pension Service (日本年金機構) without the other spouse's consent or knowledge. The split is fixed at 50% by statute and applies only to the periods during which the requesting spouse was registered as a Category 3 insured person (typically a spouse earning less than approximately ¥1.3 million annually and dependent on the other spouse's Employee Pension coverage).

The 2-year deadline under Art. 78-2(2) is treated as a strict statute of limitations (除斥期間). Japanese courts have consistently refused to allow late filings even when the delay was caused by misinformation, illness, or postal failures. Filing within the deadline is the single most important practical consideration.

Practical implication: If your spouse has substantial corporate pension or iDeCo assets, do NOT assume pension splitting captures them. Negotiate separately under property division (財産分与, Civil Code Art. 768) — the 2-year deadline for that route differs (also 2 years from divorce under Art. 768(2), but counted separately).

1. Obtain the Information Notification (情報通知書) — file 年金分割のための情報提供請求書 with any Japan Pension Service branch. This shows both spouses' Employee Pension records during marriage and the maximum possible split. Processing: 3-4 weeks. Cost: free.
2. Reach an agreement on the split ratio — either through a notarized divorce settlement (公正証書) recording "按分割合 0.5" or through family court mediation (調停) / adjudication (審判).
3. File the Standardized Remuneration Adjustment Request (標準報酬改定請求書) — submit to Japan Pension Service within 2 years of divorce, attaching the notarized agreement or family court order.
4. Confirmation notice arrives — typically 2-4 weeks after filing. The split is now permanent and adjusts both spouses' future pension calculations.

1. No agreement needed — confirm you were registered as a Category 3 insured person during the marriage (most homemakers, low-income spouses).
2. File the Standardized Remuneration Adjustment Request — submit to Japan Pension Service within 2 years of divorce.
3. Confirmation arrives in 2-4 weeks — the 50% split is applied automatically to Category 3 periods.

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Pension splitting eligibility is determined by insurance registration in the Japanese system, not citizenship. A foreign spouse who worked in Japan and paid into Employee Pension, or who was registered as a Category 3 dependent, has the same splitting rights as a Japanese citizen. If the foreign spouse returns to their home country after divorce, they can still receive Japanese pension benefits at age 65 — subject to either Japan's pension transfer agreements (社会保障協定, in force with the US, UK, Germany, France, Korea, Australia, Canada, and others) or the Lump-sum Withdrawal Payment system (脱退一時金, Art. 14 of Supplementary Provisions).

• Filing from abroad is possible but requires either a Japanese tax representative (納税管理人) or in-person filing. Plan to file before leaving Japan if practical.
• Document residency periods: Japan Pension Service may require proof of insurance category during specific marriage years.
• Bilateral agreements affect taxation: pension benefits received abroad may be taxed differently depending on the relevant social security totalization agreement.

A wife in her late 40s, married for 15 years, was registered as a Category 3 dependent throughout. Her husband, a Tokyo corporate employee earning approximately ¥9 million annually, opposes pension splitting in divorce mediation. Outcome: She files Category 3 Division unilaterally for the post-April 2008 portion (approximately 13 years) — no husband consent needed, automatic 50% split. For the pre-2008 portion (2 years), she files Agreed Division through family court mediation, where the court grants the statutory maximum 50% per established practice. Estimated monthly pension increase at age 65: approximately ¥40,000-¥55,000 for life.

Both spouses earned similar incomes throughout a 10-year marriage. The wife earned slightly less in earlier years; the husband earned slightly less in later years. Outcome: They obtain an Information Notification showing the maximum possible split. Because their pension records are already similar, agreed splitting at 50% produces only a minor adjustment (approximately ¥3,000-¥8,000 monthly). They use the Information Notification to confirm whether the cost-benefit of court filing justifies the procedural effort — sometimes dual-income couples choose to skip pension splitting and rely on property division for major asset allocation instead.

A French national who lived in Japan for 8 years on a Spouse of Japanese National visa, registered as Category 3 dependent throughout, divorces and returns to France. Outcome: She files Category 3 Division before leaving Japan (2-4 week processing). At age 65, she becomes eligible for Japanese Employee Pension benefits under the Japan-France social security agreement, receiving monthly payments transferred to her French bank account. Alternative path: file for Lump-sum Withdrawal Payment within 2 years of leaving Japan, forfeiting future pension rights but receiving a one-time payment of approximately 36 months' worth of contributions.

You permanently lose pension splitting rights. The deadline is strict (除斥期間, statute of limitations not subject to tolling). Even if your ex-spouse agrees afterward, Japan Pension Service will reject the filing. Recovery is impossible. Action: file within 2 years even if the split ratio is undecided — you can file with court mediation pending.

No. Category 3 Division is unilateral by statute (Art. 78-14). Your ex-spouse cannot prevent it, withhold consent, or appeal it. The split applies automatically to Category 3 periods after April 2008.

It depends on (a) your spouse's salary during marriage, (b) the length of marriage, and (c) which division route applies. Typical ranges for long-term homemaker marriages: ¥30,000-¥60,000/month for life beginning at age 65. Obtain the Information Notification (情報通知書) from Japan Pension Service for your specific estimate — it's free and definitive.

No. Splitting adjusts both spouses' standardized remuneration records. Your ex-spouse's eventual pension will be lower, but the change takes effect only when they begin drawing pension (typically age 65). They continue working and contributing normally; the split applies to the future calculation.

Then there is no Employee Pension to split. Pension splitting applies exclusively to Employee Pension and former Mutual Aid Association records. Self-employed individuals contribute only to National Pension (国民年金), which has no splitting mechanism. Consider negotiating retirement savings, life insurance, and business assets under standard property division (財産分与) instead.

Yes. Eligibility depends on insurance registration, not nationality. File before leaving Japan if possible, or appoint a Japanese tax representative (納税管理人) for remote filing. Benefits payable at age 65 are typically transferred internationally under social security agreements with major countries.

For Category 3 Division: usually no — the process is administrative and well-supported by Japan Pension Service staff. For Agreed Division: a lawyer is recommended if (a) your spouse refuses to agree, (b) you need family court mediation, (c) the marriage involves complex pension history (mutual aid mergers, multiple employers), or (d) you are a foreign spouse navigating Japanese procedures for the first time.

These are NOT subject to pension splitting but ARE typically subject to property division (財産分与, Civil Code Art. 768). The valuation method differs (current market value as of separation date, not future benefit), and the deadline is also 2 years from divorce but tracked separately. Address both routes together in your overall divorce settlement.

1. ☐ Within 1 month of divorce: file the Information Notification request (情報通知書) to confirm pension records and splitting potential
2. ☐ Determine which route applies — Agreed Division, Category 3 Division, or both
3. ☐ For Agreed Division: record split ratio in notarized divorce agreement (公正証書) or initiate family court mediation (調停)
4. ☐ For Category 3 Division: prepare to file directly with Japan Pension Service (no agreement needed)
5. ☐ File the Standardized Remuneration Adjustment Request (標準報酬改定請求書) within 2 years — this is the single critical deadline
6. ☐ Confirm receipt of the Confirmation Notice from Japan Pension Service
7. ☐ Address corporate pension, iDeCo, and private annuities under property division (財産分与) separately
8. ☐ For foreign spouses leaving Japan: confirm bilateral agreement coverage or evaluate Lump-sum Withdrawal Payment alternative

• This article is for general information, not legal advice for a specific case. Pension records, eligibility, and projected benefits vary individually — obtain the Information Notification (情報通知書) from Japan Pension Service for accurate figures.
• Last updated: May 18, 2026. Pension splitting procedures and bilateral agreements may change; the 2-year deadline is the most stable element.
• Practice area: Family law (divorce), social security, international family law.
• For consultation regarding pension splitting, foreign spouse divorce procedures, or coordination with property division, contact our office through the inquiry form.