- August 25, 2026
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If you’re a foreign employee in Japan, it’s easy to get confused about how your company DC and iDeCo differ—and how to use them together. Watching your savings grow on top of your salary feels reassuring, sure. But what happens to all that money if you leave Japan? That question worries a lot of people.
That’s what this guide is here for. Certified financial planner Masamichi Takayanagi walks you through it all—what company DC actually is, whether you can run both plans at once, how much you really save on tax, how the two stack up side by side, and what to do with your money when you leave Japan. By the end, you’ll know which plan fits you, and exactly what to sort out before you go.
So let’s start with the basics: how the two differ, and how to prepare early based on how long you’re planning to stay.
About the Supervisor & Writer
Masamichi Takayanagi
Financial Planner & columnist;
An independent financial planner with extensive experience as a financial columnist, specializing in a wide range of topics including asset management, life insurance, inheritance, loan products, and credit cards. Over 1,000 articles and projects have been contributed to the field.
1st grade Certified Skilled Professional of Financial Planning, Certified Financial Planner®.
Table of Contents
Chapter 1: What Is Company DC (Kigyo-gata Kakutei Kyoshutsu Nenkin)?
Company DC is a defined contribution pension where, as a rule, your employer puts in the contributions and you invest them yourself. It’s offered as part of your company’s benefits, and it builds up retirement savings in a separate track from your salary.
You choose your investments from the lineup your employer has set up within its company DC plan. From investment trusts to fixed deposits, you decide on a mix that suits your own thinking.
One basic difference from iDeCo is who puts in the contributions. With company DC, your employer contributes as a rule; with iDeCo, you contribute yourself. That said, company DC has “matching contributions,” where you can add your own money on top, and iDeCo has “iDeCo+,” where certain small and mid-sized employers can add to your contributions.
Chapter2: Can You Use Company DC and iDeCo Together?
The short answer: even if you’re enrolled in company DC, you can often use iDeCo alongside it. A October 2022 reform lowered the barrier to using both far more than before.
There’s one catch, though, if you use your company DC’s matching contributions. You can’t use matching contributions and iDeCo at the same time—you have to pick one or the other.
There are also limits on contributions. For an employee with company DC only, your iDeCo allowance is ¥55,000 a month minus your employer’s contribution, and iDeCo on its own has been capped at ¥20,000 a month.
From 2026, the rules start changing in stages. In April 2026, the matching-contribution restriction—that your own contribution couldn’t exceed your employer’s—was removed.
Then, from December 1, 2026, the company DC limit is scheduled to rise from ¥55,000 to ¥62,000 a month. The enrollment age and contribution limits on the iDeCo side are also under review, and heading toward being expanded.
Because these reforms take effect at different times, it’s reassuring to confirm the latest limits with your employer or plan administrator.
Chapter 3: Tax Benefits and a Simple Sample Calculation
When it comes to tax, it doesn’t matter whether the money goes in through company DC matching or through iDeCo—both are treated the same way. Each one qualifies for the “small enterprise mutual aid premium deduction,” which means every yen you contribute comes straight off your taxable income.
And when your taxable income drops, so does your income tax and resident tax—the more you earn, the bigger the effect, since it depends on your tax rate. That’s the real appeal of a defined contribution pension: you’re building savings and trimming your tax bill in one move.
Want a rough idea of how much you’d save? Take your annual contributions and multiply them by your income tax rate plus 10% for resident tax.
Say you put in ¥20,000 a month—¥240,000 over the year. At a 10% income tax rate, plus the 10% resident tax, that’s around ¥48,000 back in your pocket each year. Bump the income tax rate up to 20%, and the same ¥240,000 saves you roughly ¥72,000.
Keep in mind these are ballpark figures. What you actually save shifts depending on things like dependents or a mortgage deduction. To pin down your own number, the easiest way is to run it using your withholding slip and how much you contribute.
Let’s lay out the differences item by item.
| Item | Company DC | iDeCo |
|---|---|---|
|
Who contributes |
As a rule, your employer. You also contribute if you use matching contributions. |
As a rule, you do. With iDeCo+, your employer may add on top. |
|
Fees |
How the company and member split the cost depends on the corporate pension rules. |
¥2,829 on joining or transferring, plus ¥105 per contribution. Other financial-institution fees may also apply. |
|
Investment options |
Chosen from the lineup your employer’s company DC plan offers. |
Chosen from what the financial institution you picked offers. |
|
Freedom of choice |
The financial institution and product lineup are set by your employer’s plan. |
You choose your own financial institution, so there’s relatively more freedom. |
|
Portability when changing jobs |
You can transfer your assets to company DC, iDeCo, or another plan, depending on your new workplace’s setup. |
Depending on your new workplace, you may be able to keep your iDeCo or transfer it into company DC. |
|
Admin effort |
Since your employer is involved in running the plan, there’s relatively little for you to do yourself. |
You handle choosing a financial institution and the enrollment and change procedures yourself. |
To sum up: company DC wins on convenience, while iDeCo wins on freedom of choice. If your eligibility changes—because you switch jobs or move overseas—check what procedures you need to take.
Chapter5: What Happens When You Leave Japan?
If you’re heading home for good, one thing you’ll want to think about is what happens to the pension assets you’ve built up. Here’s a key distinction: the lump-sum withdrawal for a defined contribution pension is a completely separate system from the one for National Pension or Employees’ Pension Insurance.
We’ve covered the public pension refund in detail in a separate article, so here we’ll stick to your company DC and iDeCo assets.
Leaving Japan doesn’t mean you can simply cash these out. There is, however, a path: if you’re a foreign national who moves home for good, becomes an overseas resident, and can no longer pay into iDeCo, you may qualify for a lump-sum withdrawal—as long as you meet certain conditions.
The main ones are being under 60, having contributed for five years or less (or holding pension assets of ¥250,000 or less), and not being entitled to disability benefits. Just being a foreign national living abroad isn’t enough on its own.
Timing matters too, and the deadline depends on where you file. Claim directly from your company DC’s record-keeping administrator after losing eligibility, and you generally have six months, counting from the month after your eligibility ends. But claim through the individual-type administrator or the National Pension Fund Association instead, and you have two years from the last time you lost membership in company DC or iDeCo. In other words, missing that six-month window doesn’t automatically shut the door.
If you don’t meet the conditions, you generally can’t pull your money out right away. Instead, you’ll hold onto the assets until you’re old enough to receive them—usually 60 or later—for example by staying on as an iDeCo “instruction-only member,” who keeps their investments running without adding new contributions.
Company DC comes with one more thing to watch: automatic transfer. Miss the transfer paperwork within six months of losing eligibility, and your assets can be shifted automatically to the National Pension Fund Association.
That’s worth avoiding. Once transferred, your money just sits there—uninvested—while fees pile up. As of 2026, you’re looking at ¥4,348 up front when the automatic transfer happens, then ¥98 a month to manage it. And if you later want to move that money back into company DC or iDeCo, that’s another ¥550.
So once you know you’re leaving—or resigning—check early whether you qualify for the lump-sum withdrawal or need to move your assets. The conditions and deadlines shift depending on how you claim, so it’s worth working through it with your plan administrator.
Related Post
Chapter6: Which Should You Prioritize?
Which one to prioritize really comes down to your situation. There’s no one-size-fits-all answer—it depends on how you work and how long you plan to stay.
If your employer offers matching contributions, the smart choice shifts with how much your company puts in. When matching is on the table, it’s worth weighing the amount you can contribute, the investment options, and the fees against what iDeCo offers before you decide.
Planning to head home in a few years? Then it’s worth being careful not to lock away too much in assets that are hard to withdraw when you leave. Since this money is tied up until you’re 60, set your contribution amount thoughtfully.
But if you’re in it for the long haul—building retirement savings in Japan over the years—the tax-free growth becomes much easier to put to work for long-term wealth building. Over a long horizon, using company DC and iDeCo together is where they really shine.
The higher your taxable income and tax rate, the more the same contribution tends to cut your income tax.
We can’t give you a definitive answer, but thinking along two axes—how long you’ll stay and how much you earn—makes it easier to settle on a direction. If you’re unsure, starting small while you check each plan’s deadlines and limits is one perfectly good option.
Chapter7: Frequently Asked Questions About Company DC and iDeCo
Here we’ve gathered the most common worries about company DC for foreigners, along with answers to each.
Q. My employer has company DC. Can I also join iDeCo?
Yes, if you meet certain conditions. But if you use your company DC’s matching contributions, you can’t use iDeCo at the same time.
Until November 2026, if you’re in a corporate pension, your iDeCo contributions are generally capped at ¥20,000 a month, and the total—together with your employer’s company DC contributions and any other-plan equivalent such as DB—must stay within ¥55,000 a month.
From December 1, 2026, the rules change: the combined contribution limit for a corporate pension plus iDeCo becomes ¥62,000 a month as a rule.
Q. What happens to the money I’ve saved if I move back home?
Moving home doesn’t, by itself, let you freely withdraw your company DC or iDeCo assets. If you’re a foreign national who becomes an overseas resident and meets the set conditions—such as your total contribution period and asset amount—you may be able to receive a lump-sum withdrawal.
If you don’t meet the conditions, as a rule you can’t withdraw right away, and you’ll manage the assets until you reach the eligible payout age. The company DC and iDeCo lump-sum withdrawal is a separate system from the public pension lump-sum withdrawal.
Q. Which is better for tax—company DC or iDeCo?
When it comes to the income deduction for contributions you make yourself, there’s no big difference between company DC matching and iDeCo. The full amount qualifies for the “small enterprise mutual aid premium deduction” either way.
So rather than deciding on tax alone, it’s best to compare things like whether your employer contributes, how much you can put in yourself, the fees, and the investment options.
Chapter8: Summary
Company DC is a plan where, as a rule, your employer makes the contributions, while iDeCo is a private pension where you contribute yourself. Since October 2022, you’ve been able to use company DC and iDeCo together if you meet certain conditions. That said, you can’t use company DC matching contributions and iDeCo at the same time—so you pick one or the other.
On tax, both employee contributions through company DC matching and iDeCo contributions are fully deductible from your income. Where they differ is in things like who bears the fees, the investment options, and whether you can choose your own financial institution.
If you’re planning to move back home, it’s worth paying attention to what happens to the assets you’ve built up. Meet certain conditions and you may receive a lump-sum withdrawal; fall short, and as a rule you can’t withdraw right away—you’ll manage the assets until you reach the eligible payout age.
*This article is provided for general informational purposes only and does not constitute individual financial or legal advice. The figures shown here are based on the sources cited and will vary depending on your income, tax rate, employer’s plan, and how long you contribute. Information is accurate as of August 2026. Contribution limits, tax treatment, and the rules for withdrawing when you leave Japan differ case by case and may change with future reforms, so please confirm with your plan administrator, a certified financial planner, or a qualified professional before acting on any information in this article.
