What is iDeCo?
iDeCo is Japan's individual defined contribution pension plan. Contributions are fully tax-deductible from income, investment gains grow tax-free, and withdrawals after age 60 receive favorable tax treatment. For a salaried employee in the 20% tax bracket contributing the maximum 23,000 yen monthly, the annual tax savings alone are about 55,200 yen.
What you may contribute depends on how you earn. A self-employed person, in category 1 of the national pension, may pay in up to 68,000 yen a month, or 816,000 yen a year. A company employee with no corporate pension is capped at 23,000 yen a month (276,000 yen a year), a public servant at 12,000 yen a month (144,000 yen a year), and a full-time homemaker at 23,000 yen a month. The floor is 5,000 yen a month, set in steps of 1,000 yen, so the plan is sized to a household budget rather than to an ambition.
Triple Tax Advantage
iDeCo offers three layers of tax benefits: deductible contributions reduce your current income tax and resident tax, investment returns compound without annual taxation, and withdrawals can be received as a lump sum (taxed as retirement income with generous deductions) or as an annuity (taxed as pension income). No other Japanese investment vehicle offers all three benefits.
The deduction is worth more than the usual headline figure suggests, because it removes income from two taxes at once. An employee earning 5 million yen a year pays 20% income tax and 10% resident tax, so contributing 23,000 yen a month - 276,000 yen a year - saves 55,200 yen of the first and 27,600 yen of the second, 82,800 yen in all. Kept up for 30 years the saving accumulates to roughly 2.48 million yen. It is the rare part of investing that is certain: it arrives whatever the market does.
The second layer is the absence of tax on growth. A taxable account gives up 20.315% of investment income; inside iDeCo the rate is zero. Paying in 23,000 yen a month at 5% a year for 30 years turns 8.28 million yen of contributions into about 19.14 million yen, of which some 10.86 million yen is gain - in a taxable account roughly 2.21 million yen of that gain would go to the tax office. The third layer arrives at the end: a lump sum is taxed under the retirement income deduction and instalments under the public pension deduction.
iDeCo Compared with the NISA
On liquidity the NISA wins outright: money in a NISA can be taken out on any business day, while iDeCo stays locked until 60. Anything you might need before then - a deposit on a home, a child's school fees - belongs in the NISA and not here. The usual order of priority is the emergency fund first, then iDeCo for the income deduction, then the accumulation quota of the new NISA, and last its growth quota. iDeCo does not compete with the NISA; it is the layer underneath, funded with money you have already decided not to touch.
Key Considerations
The major drawback is that funds are locked until age 60 with very few exceptions. This makes iDeCo unsuitable for emergency savings or medium-term goals. Monthly contribution limits vary by employment status, ranging from 12,000 to 68,000 yen. Choose low-cost index funds within iDeCo to maximize the compounding benefit of tax-free growth.
The most common misconception is that iDeCo guarantees your capital. The menu holds both principal-protected products - term deposits and insurance - and funds whose value moves, and choosing a fund means accepting that the balance can fall below what you paid in. Over a horizon of 20 to 30 years the historical record of a global equity index fund makes ending below cost very unlikely, but that is a statement about long periods, not a guarantee attached to the account.
Fees are the other practical point, because they are paid whether the market rises or falls. Joining costs 2,829 yen once, and every month 105 yen goes to the national pension fund federation and 66 yen to the trust bank: 171 yen that nobody can avoid. On top of that some providers add an administration fee of their own, while several of the large online brokers charge nothing. The gap is not small: 500 yen a month against the 171 yen minimum comes to about 118,000 yen over 30 years.
Pros, Cons and the Payout Decision
The strongest argument for iDeCo is that part of its return is fixed in advance. The market's return cannot be known; the deduction's is arithmetic, and for the employee in the example it adds up to some 2.48 million yen over 30 years before any investment gain is counted. No ordinary investment product offers that, which is why this account is usually filled before a taxable one.
Against it stand the lock-up and the tax at the end. Anything above the retirement income deduction is taxable, so someone who also receives a large severance payment from an employer can meet both in the same year. There are three ways to take the money - all at once, in instalments, or a mix of the two - and the right one depends on the size of that severance and on other pension income. Where the severance is small the lump sum usually works out better; where it is large, instalments or a combination cost less tax.
How the Scheme Grew
The scheme started in 2001 as the individual-type defined contribution pension, open only to the self-employed and to employees without a company plan. The reform of January 2017 extended it to public servants, homemakers and employees who already had a corporate pension, which brought almost everyone between 20 and 60 inside. The nickname iDeCo was coined for that relaunch, and awareness rose sharply from then on.
In 2022 the entry age was raised to 65 and the latest start for drawing the money was pushed out to 75. As the public pension covers a smaller share of retirement, the account has moved from a curiosity to a central piece of planning. Membership reached about 3.3 million in 2024, still only around 5% of those who could use it, so the scheme is closer to its beginning than to maturity.