Japan is about to give its private pension accounts far more room. From December contributions, an employee without a company plan can put up to 62,000 yen a month into iDeCo, up from 23,000 yen, and savers who meet certain conditions can keep contributing until age 70, the Ministry of Health, Labour and Welfare said in an Oct. 20 guide. Employees and civil servants will share a combined iDeCo and company pension cap of 62,000 yen; for civil servants, whose mutual aid pension is deemed to use 8,000 yen of it, the iDeCo limit rises to 54,000 yen from 20,000 yen. As Capital Times reported, the change nearly triples the limit for many workers.

The reform is sound. It is also aimed at the wrong constraint. The binding problem for iDeCo is not how much members may save. It is how few people are members at all. Tokyo should follow the higher caps with automatic enrollment through employers, with an easy opt-out and a simple default fund.

A Ceiling Few People Reach

The numbers are stark. iDeCo had 3.952 million members at the end of April 2026, according to a June report by Daiwa Institute of Research. That is about 13 times the figure at the end of 2016, before eligibility was widened, but the take-up rate was only about 5.8% at the end of March: 3.928 million members against roughly 67.57 million eligible people, a count Daiwa took from the latest available pension data, for March 2025. Fewer than one in 10 eligible people use a plan that offers a full income tax deduction on contributions and tax-free investment growth, benefits the ministry confirmed will continue.

Raising the limit mostly helps people already saving. Daiwa found that 57% of employees without a corporate pension already contribute 20,000 to 23,000 yen a month, at or near the old cap. Those savers will welcome the extra room, and so will the asset managers and online brokers that collect their fees. But the same report showed about 40% of that group contributing only 5,000 to 14,000 yen, and younger members tended to put in less.

The last increase offers a warning. When limits rose in December 2024, about 70,000 people joined that month, the most since the 2017 expansion, Daiwa said. The effect faded fast. New joiners fell to around 30,000 a month in the second half of 2025, and the full-year total of 392,000 was the second-lowest since 2019. January 2026 started at 48,000 and then followed the same downward path. A publicity bump is not a policy.

Defaults Do the Work

Other countries have tested the alternative. Britain began enrolling workers into workplace pensions automatically in 2012, and its Department for Work and Pensions said private sector participation rose 43 percentage points from 2012, to 85% of eligible employees in 2018. More than 10.2 million workers had been automatically enrolled by the end of 2019. Among employers with a scheme used for automatic enrollment, only 9% of those enrolled in the 2018/19 financial year opted out within a month, the department said. People kept saving because saving became the path of least resistance.

Japan's own data point the same way. Daiwa identified employees without a corporate pension as the largest group of members, about 2.03 million people, and said it is the group with the most room left to grow, since many work at small companies that offer no company plan. Those are exactly the workers an employer-based default would reach. Daiwa's own prescription is wider promotion of iDeCo+, the scheme that lets small and midsize employers add contributions, together with financial education and employer support. Those steps are worth taking, but each still relies on a worker filling in forms and choosing a fund.

What Tokyo Should Do

First, require employers without a corporate pension to enroll new and existing staff in iDeCo automatically, at a modest starting contribution taken through payroll, with a clear right to opt out within a fixed period. Workers who want nothing to do with it would lose only a few minutes. Workers who never get around to signing up would be saving by default.

Second, give every automatically enrolled member a single, low-cost, diversified default fund, so that the choice of product is never the reason someone does not start. Providers can still offer their menus to members who want to choose.

Third, make small-employer participation in iDeCo+ simpler and more visible, so that a company match becomes ordinary rather than exceptional. That is consistent with the support for employers that Daiwa recommends.

The objection is cost and paternalism: small businesses would carry new payroll duties, and households under pressure from higher prices may want cash now. Both concerns are real. Britain addressed them by phasing in contribution rates and employer duties over several years, and an opt-out preserves every worker's freedom to decline. The Board would accept a slow phase-in. It would not accept a system that rewards the few who already save while leaving more than 90% of eligible people outside it.

The first test of the December reform will be the monthly count of new members that follows it. Daiwa already recommends watching whether the new limits produce lasting growth in sign-ups. If it repeats the 2025 pattern of a short spike and a long fade, the case for automatic enrollment will be made by the data.

This editorial is general commentary, not financial advice.