Plenty of Korean employees still don't even know whether their retirement pension is DB or DC. Yet that single letter can decide the size of their retirement nest egg. This guide breaks down the difference and how to choose — from an employee's point of view.
Preview 30 years of DC investing in the Compound Calculator →
DB vs DC — the core difference in one line
- DB (Defined Benefit): the payout is fixed. The company invests the money, and any gains or losses belong to the company
- DC (Defined Contribution): the contribution is fixed. You invest the money, and any gains or losses are yours
- It comes down to "who carries the risk, and whose the returns are"
With DB, your payout is set by your salary at retirement, so there's nothing for you to manage. With DC, you directly invest the money the company deposits — growing it or losing it yourself.
Who invests your severance, and who keeps the returns
A white paper released in May 2026 by Korea's Financial Supervisory Service (FSS) and Ministry of Employment and Labor puts numbers to this difference. At the end of 2025, total retirement pension reserves reached ₩501.4 trillion, up 16.1% year over year, with an annual return of 6.47% — the highest since the system launched.
| Plan | Reserves (share) | Annual return |
|---|---|---|
| DB (Defined Benefit) | ₩228.9T (45.7%) | 3.53% |
| DC + corporate IRP | ₩141.6T (28.2%) | 8.47% |
| Personal IRP | ₩130.9T (26.1%) | 9.44% |
DB is the lowest, while DC and IRP (Individual Retirement Pension — a tax-advantaged personal retirement account) are more than double. That's the gap between a company conservatively managing DB and an individual actively investing DC/IRP.
Wage growth vs investment return — the real decision criterion
The heart of the choice is simple: is your wage growth higher, or is the market's investment return higher?
The DB payout formula is average daily wage × 30 days × total years of service. Average wage is your last three months of pay divided by the days in that period, so the higher your final salary, the better off you are. In effect, DB is tied to your wage growth rate.
- Expected wage growth > investment return → DB wins (e.g., a workplace with fast promotions or seniority-based raises)
- Expected investment return > wage growth → DC wins (a salary plateau, or you're willing to invest)
The decisive variable is how you invest. Principal-and-interest guaranteed products returned 3.09%, while performance-based (market-invested) products returned 16.80% — roughly a 5x difference. Yet 75.4% of reserves (₩378.1T) is still parked in guaranteed products.
The polarization is stark too. The top 10% (19.5% return) held 84% in performance-based products, while the bottom 10% (0.5% return) held 74% in guaranteed products. That's the gap between "those who invested and those who left it idle." Even if you pick DC, leaving it sitting in a deposit can underperform DB.
What you must know before converting from DB to DC
Converting DB → DC is allowed, but DC → DB reverse conversion is outright prohibited — it would let you push your personal investment losses onto the company. Once you convert, that's final, so think it through. At conversion you choose between rolling your existing reserves into DC all at once, or keeping the past portion under DB.
The most important timing factor is the wage peak system (imgeumpik-je — a scheme that cuts pay in the years before retirement in exchange for extended employment). Because DB is based on your average wage just before retirement, if you convert after the wage peak cuts your pay by 20~30%, your payout is settled on that reduced salary. The textbook move is therefore to convert to DC before the wage peak kicks in, while your salary is still high, locking in reserves at that higher base.
When you leave the company, it goes to IRP — transfer rules and tax savings
When you leave, the rule is to transfer your entire DC balance into an IRP. You can't move just part of it. Since November 2024, when you switch DC providers (financial institutions), you can transfer your existing holdings as-is without having to sell them first.
How you withdraw the severance held in your IRP makes a big difference to your tax bill. Taking it as a pension cuts your retirement income tax by up to 30% (received within 10 years) to 40% (over 10 years). The pension income tax rate also drops with age.
| Age at pension withdrawal | Pension income tax rate |
|---|---|
| 55~69 | 5.5% |
| 70~79 | 4.4% |
| 80+ | 3.3% |
Splitting it into a pension is more tax-efficient than taking it all as a lump sum.
DC investing in practice: default options and the 70% risk-asset cap
If you choose DC, how you invest is everything. The default option (sajeon-jijeong unyong jedo — a "pre-designated investment scheme"), in force since July 2023, automatically invests your money in a pre-set product even if you give no investment instructions. It's a safeguard against everyone defaulting into guaranteed products.
There's also an investment cap. DC and IRP can invest up to 70% of reserves in risk assets (such as funds with over 40% equity weighting), with the remaining 30% required to be safe assets. You can't go 100% stocks, but investing even just that 70% well makes a large long-term difference.
Simulate your balance 30 years out with 70% in risk assets, in the Compound Calculator → — change the return assumptions and see the long-term DC-vs-DB gap for yourself.
Frequently asked questions
Q. How do I check whether I'm DB or DC? A. You can check with your company's HR team or in your retirement pension provider's app (bank or brokerage). If you're directly investing from an account in your own name, it's likely DC; if there's no investment screen, it's likely DB.
Q. DC had higher returns — so is DC always the right answer? A. No. DC returns depend on how you invest. Even in the white paper, performance-based products returned 16.80% while guaranteed products managed only 3.09%. If you pick DC and leave it idle in a deposit, it can underperform DB. DC's advantage only comes alive when you have the will to actively invest.
Q. Once I switch to DC, can I never go back to DB? A. Correct. DC → DB reverse conversion is prohibited by the system, because it would shift personal investment losses onto the company. You should decide on the premise that the conversion is irreversible.
Q. If the wage peak system applies, is DB always worse? A. DB payouts are based on your average wage just before retirement, so if it's settled after your pay is cut, your reserves shrink. That's why converting to DC before the wage peak — while your salary is still high — is a frequently used strategy to lock in reserves. But it varies by personal situation, so run a simulation before converting.
Q. Can't I just withdraw all of my severance from the IRP right away?
A. You can withdraw it, but you lose on taxes. Splitting it into a pension instead of a lump sum gets you the retirement income tax reduction (up to 3040%) and the lower pension income tax rate (3.35.5%).
Related tools
- Compound Calculator — invest your DC balance for 30 years; how much by retirement?
- Year-End Tax Calculator — check your tax-credit refund from extra IRP contributions
- Pension Savings vs IRP guide — tax-saving strategy when adding your own funds to a severance IRP
This article is for informational purposes only; investment and tax decisions and their outcomes are your own responsibility. Returns and taxes can vary with investment results and your personal circumstances, so consult a professional for important decisions.