iDeCo: The Private-Pension Path

iDeCo Japan is the private-pension account that lets working-age residents contribute monthly toward retirement with a full income deduction on every yen contributed.¹ The trade is strict: the money is locked until age 60 or later, so the account suits residents who can leave the funds untouched for decades.¹

Confirm current details with official sources

Procedures, fees, and requirements can change. Confirm current details at the iDeCo official site (National Pension Fund Association). This article is general information, not investment advice and not tax advice; for your specific case, consult a licensed financial professional for product selection and a tax accountant (税理士) for tax treatment.

Overview

iDeCo (個人型確定拠出年金, kojin-gata kakutei kyoshutsu nenkin, "individual-type defined contribution pension") is an optional private pension under the Defined Contribution Pension Act.¹ The participant applies, contributes monthly, selects investments, and receives benefits reflecting contributions plus returns.¹

The account sits on top of public pensions as supplementary retirement savings. Tax breaks apply at three points: deductible contributions, tax-free growth, and deductions at payout.¹ Outcomes are not fixed, since benefits move with investment performance.¹

The Three Tax Stages

Contributions, growth, and payouts each get distinct tax treatment. The contribution deduction is the largest immediate benefit for higher-income residents.

Deductible contributions

The full amount contributed in the year is deductible from income under the small-scale enterprise mutual-aid premium deduction (小規模企業共済等掛金控除, shōkibo kigyō kyōsai-tō kakekin kōjo, "income deduction covering iDeCo contributions").¹² The National Tax Agency confirms the deductible amount is the full amount paid in the year for individual-type pension member contributions.²

Employees claim the deduction through year-end adjustment, while self-employed residents and employees with side income claim it on a tax return using the payment certificate sent around October to November (as of 2026-09-07; confirm current figures with the National Pension Fund Association).³ The scale is concrete: 10,000 JPY per month at 10 percent income tax plus 10 percent residence tax reduces the annual bill by 24,000 JPY (as of 2026-09-07).¹

Tax-free growth inside the account

Investment returns inside iDeCo are reinvested tax-free, while ordinary financial-product returns face a 20.315 percent withholding rate (as of 2026-09-07; confirm current figures with the iDeCo official site).¹ The compounding effect builds over the full contribution period because no annual tax drag applies inside the wrapper.¹

A separate special corporation tax of 1.173 percent per year on cumulative iDeCo assets exists in statute but is currently suspended (as of 2026-09-07).¹

Taxed withdrawals with retirement deductions

Payouts are taxed, but with dedicated deductions. Benefits arrive as a lump sum, an annuity, or a combination where the provider supports it.¹

A lump sum qualifies for the retirement income deduction (退職所得控除, taishoku shotoku kōjo, "deduction for lump-sum retirement receipts"), while an annuity qualifies for the public pension deduction (公的年金等控除, kōteki nenkin-tō kōjo, "deduction for pension-form receipts").¹³ Amounts above the applicable deduction limit are taxed, and timing close to a company retirement allowance can aggregate the retirement deduction treatment (limitation).³

Contribution Caps by Employment Status

Monthly caps run from 12,000 JPY to 68,000 JPY by pension category under current rules (as of 2026-06-14; confirm current figures with the iDeCo official site).³ The table below states the full current schedule.

Enrollment category	Monthly cap	Annual cap
Self-employed and freelancers (Category 1)	68,000 JPY3	816,000 JPY3
Company employee, no corporate pension	23,000 JPY3	276,000 JPY3
Company employee, corporate-type DC only	20,000 JPY43	240,000 JPY3
Company employee, DB only	20,000 JPY43	240,000 JPY3
Civil servant, mutual-aid pension only	20,000 JPY43	240,000 JPY3
Dependent spouse (Category 3)	23,000 JPY3	276,000 JPY3

Caps in the table above are current as of 2026-06-14.⁴³

Self-employed and freelancers: the higher cap

Self-employed residents and freelancers in Category 1 (第1号被保険者, dai-ichi-gō hihokensha, "Category 1 insured person") hold the highest cap at 68,000 JPY per month (as of 2026-06-14).³ The cap combines with National Pension Fund contributions, so residents paying into that fund share the ceiling.³

The larger ceiling is why the tax advantage is most generous for higher-income self-employed residents. Annual contributions reach 816,000 JPY at the maximum (as of 2026-06-14).³

Company employees: with and without corporate pensions

Employees with no corporate pension contribute up to 23,000 JPY per month (as of 2026-06-14).³ Employees enrolled only in a corporate-type DC plan (企業型確定拠出年金, kigyō-gata kakutei kyoshutsu nenkin, "corporate-type defined contribution pension") or only in a DB plan contribute up to 20,000 JPY per month (as of 2026-06-14).⁴³

The 20,000 JPY figure is a December 2024 revision outcome, raised from 12,000 JPY for corporate-DC-only, DB-only, and civil-servant members.⁴³ The revision also moved DB-equivalent measurement from a flat 27,500 JPY evaluation to case-by-case measurement, so some members face a lower residual cap than the 20,000 JPY maximum.⁴ Members in both DB and corporate-type DC share a combined residual formula under the same maximum.⁴

Confirm your corporate pension type with HR first

Which cap applies depends on whether your employer runs a corporate-type DC, a DB plan, both, or neither. Ask HR for the plan type before choosing a contribution amount, since the wrong assumption produces a rejected or reduced application.⁴³

Civil servants and dependent spouses

Civil servants under the mutual-aid pension contribute up to 20,000 JPY per month after the December 2024 rise from 12,000 JPY (as of 2026-06-14).⁴³ Dependent spouses in Category 3 (第3号被保険者, dai-san-gō hihokensha, "Category 3 insured person") contribute up to 23,000 JPY per month (as of 2026-06-14).³

The deduction only helps residents with taxable income. Participants with no taxable income get no income-tax benefit for that year, and the deduction applies only to the participant's own income, never to a spouse's.¹ Contributions start at 5,000 JPY per month in 1,000 JPY increments, change once per year, and can stop at any time.¹

Eligibility for Foreign Residents

Foreign residents join on the same terms as Japanese nationals. Pension enrollment is the gate, not nationality or permanent residency.¹⁵⁶

Pension enrollment as the gate

Enrollment requires contributor status in the National Pension (国民年金, kokumin nenkin, "National Pension") or Employees' Pension Insurance (厚生年金, kōsei nenkin, "Employees' Pension Insurance").¹ Company employees are covered automatically through payroll enrollment in practice (limitation).⁵

Residents exempt from National Pension premiums, and residents with unpaid premiums, cannot enroll until the exemption or arrears are resolved.¹⁵ Check pension payment status before starting the iDeCo application.⁵

Age and residence requirements

The general enrollment band runs from age 20 until 65, with contributions allowed until 65 under conditions and old-age benefits beginning at 60 (as of 2026-09-07; confirm current figures with the iDeCo official site).¹ A registered Japanese address and My Number are required in practice for the application (limitation).⁵

An extension of the upper band to under 70 is planned from December 2026 or January 2027 contributions onward but is not yet in force (as of 2026-06-14).³⁵ Current age rules apply until the effective date is confirmed.³⁵

Joining and Managing the Account

Joining runs through a provider, not directly at a government counter. The provider (運営管理機関, un'ei kanri kikan, "operating management institution") administers the account and offers the investment lineup.¹

The flow below sketches the standard sequence from provider choice to first debit.

Choose a provider and apply through its site, then wait for National Pension Fund Association review, which takes about one to two months in practice (limitation).³⁵ Company employees add an employer certificate signed by HR, often adding two to three weeks (limitation).³⁵

The practical document set is identity verification, a My Number Card (or notification plus photo ID), a Basic Pension Number, a residence card showing the current address, and a Japanese bank account for the monthly debit on the 26th (limitation).³⁵ The provider explains products but cannot recommend specific ones.¹

Application steps and documents

Applications with mismatched names, addresses, or pension numbers stall at review. Match the katakana name and registered address across the residence card, My Number document, and bank account before submitting (limitation).³⁵

Contributions debit monthly with no advance or delayed payment. Corporate-DC members must use fixed monthly contributions rather than annual-unit contributions (年単位拠出, nen-tan'i kyoshutsu, "lump contributions in chosen months").¹

Fees and contribution mechanics

Account opening and ongoing management fees apply and vary by institution, and investments are purchased from the contribution amount after fees are deducted.¹ Fee levels differ across providers, so the fee schedule is part of comparing providers in structural terms.¹

Assets are portable across job changes through specified transfer procedures.¹ Changing jobs, marrying, or moving between employment and self-employment does not strand the account as long as pension enrollment continues.¹

Leaving Japan: What Happens to the Account

Assets cannot in principle be withdrawn before 60, and leaving Japan does not by itself unlock early withdrawal.¹ The funds remain invested in Japan after departure.¹⁶

The standard path after departure is to stop contributions and continue as an investment instructor (運用指図者, un'yō sashizu-sha, "non-contributing holder directing investments"), managing the existing balance without new contributions until benefit age (limitation).⁵ Claiming at benefit age from abroad involves procedural complexity, including a receiving-account arrangement.⁶

The decision below shows the two post-departure paths and the narrow gate for the second one.

A lump-sum withdrawal payment (脱退一時金, dattai ichiji-kin, "early withdrawal under strict conditions") requires all seven conditions: under 60, no corporate-type DC enrollment, ineligibility for iDeCo including foreign nationals residing overseas, not an overseas Japanese national aged 20 to 59, a contribution period of five years or less or assets of 250,000 JPY or less, no disability benefits, and a claim within two years of disqualification.¹ Most long-tenure or higher-balance holders fail the period-or-balance condition and must wait until benefit age.¹⁶

Receiving at 60 requires a total enrollment period of 10 years or more. Shorter enrollment pushes the start back toward 61 to 75, and benefits must be claimed before 75.¹

Assume the money stays until 60 when you decide

Departure rarely qualifies for the lump-sum withdrawal, since the five-year and 250,000 JPY conditions exclude most established accounts. Treat iDeCo money as inaccessible until benefit age and keep separate liquid savings for departure costs.¹

iDeCo and NISA Side by Side

iDeCo gives an income deduction on contributions plus tax-free growth but locks funds until 60, while NISA gives tax-free growth with no income deduction and allows withdrawal at any time.¹⁶ The accounts complement rather than replace each other.³

Practitioner guidance sequences emergency funds first, then splits spare funds between iDeCo for retirement and NISA for medium- to long-term building (limitation).³ This article describes the mechanics of each wrapper and makes no recommendation about which account or product any reader should choose.¹

Good to know

Locked until 60 even if you leave Japan

Departure does not convert iDeCo into a departure payout. Early withdrawal needs all seven lump-sum conditions, including the short-period or small-balance test, so longer-held or larger accounts stay invested until benefit age.¹ Residents uncertain about their length of stay often keep the flexible portion of savings outside iDeCo.⁶

No taxable income means no deduction benefit that year

The headline deduction only reduces tax actually owed. A dependent spouse or low-income resident contributing the maximum still gets tax-free growth, but the income-deduction saving for that year is small or zero.¹ The deduction also never transfers to a spouse's income.¹

The December 2026 cap reform is planned, not current

Quoted figures of 62,000 JPY for employees and civil servants and 75,000 JPY for the self-employed, plus the under-70 band, are planned from December 2026 or January 2027 contributions onward and are not yet in force (as of 2026-06-14).³⁵ The 2025 reform hub sits with the Ministry of Health, Labour and Welfare, but providers will confirm the effective date.⁷ Act on the current 12,000 to 68,000 JPY schedule until the change takes effect.³

US persons still owe home-country tax on iDeCo holdings

iDeCo and National Tax Agency treatment removes Japanese tax only. Residents taxed on worldwide income still face home-country reporting and pooled-vehicle consequences outside Japanese rules, so US persons should confirm treatment with a tax accountant before contributing (limitation).²⁶

This article explains investment mechanics and product structures for reference; it is not investment advice.

See also

• Repatriating Pension and Investment Balances at Departure
• Bank Account Opening Documents in Japan
• My Number Reporting for Bank Accounts
• Health Insurance and Pension for Freelancers
• Online Brokerages in Japan: Rakuten, SBI, Monex

References

Footnotes

1. 国民年金基金連合会 (National Pension Fund Association). "iDeCo: An additional pension you can join and choose on your own" (English). https://www.ideco-koushiki.jp/english/ ↩ ↩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

2. 国税庁 (National Tax Agency). 「No.1135 小規模企業共済等掛金控除」 (as of 2025-04-01 statutes). https://www.nta.go.jp/taxes/shiraberu/taxanswer/shotoku/1135.htm ↩ ↩² ↩³

3. みんなの税金 (Min-taxes). "iDeCo Tax Savings and How to File: Full Contribution Deduction" (English, last updated 2026-06-14, cites NTA, iDeCo official, MHLW). https://min-taxes.com/en/column/ideco-setsuzei-effect/ ↩ ↩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

4. 厚生労働省 (Ministry of Health, Labour and Welfare). 「iDeCoの拠出限度額が1.2万円から最大2万円に変わります」(December 2024 revision flyer, PDF). https://www.mhlw.go.jp/content/12500000/001252820.pdf ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

5. 在日マネーナビ (Zainichi Money Navi, MRI Co., Ltd.). "iDeCo Complete Guide for Foreigners" (English, published 2026-06-10, updated 2026-07-17). https://money.m-ri.co.jp/en/ideco-guide.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³

6. JapanLifeStart Editorial Team. "iDeCo for Foreign Residents in Japan: Eligibility, Tax Break and the Leaving-Japan Catch" (English, published 2026-06-19, updated 2026-07-27). https://japanlifestart.com/en/money-cards/ideco-guide-foreign-residents ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

7. 厚生労働省 (Ministry of Health, Labour and Welfare). 「確定拠出年金制度」 (system top page with 2025 reform hub). https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/nenkin/nenkin/kyoshutsu/index.html ↩