When starting a job, there is something worth weighing as carefully as the monthly paycheck: whether to leave retirement savings in the company's hands or manage them personally, with the payout arriving decades later.
Joo Hyun-ji (pictured), a manager at Woori Bank's pension business department, said the wage growth rate is the key variable for defined benefit (DB) plans while the investment return is decisive for defined contribution (DC) plans. "If you expect your salary to rise steadily, a DB plan is likely more favorable," the manager said. "If wage gains are small and you can lift long-term investment returns, a DC plan is more likely to work in your favor."
In a sample case presented by Woori Bank, a subscriber who contributed 10 million won a year for 20 years, or 200 million won in total, would accumulate about 430 million won with an aggressive asset allocation, compared with about 270 million won for someone who stuck mainly to principal-and-interest guaranteed products. The same contributions, in other words, can produce payouts that differ by nearly twofold depending on investment results.
DB if Wages Climb Fast, DC if Returns Do
Under a DB plan, the retirement payout is set by average wages at the time of retirement and years of service. The company manages the reserves and bears responsibility for the results.
Under a DC plan, by contrast, the company deposits at least one-twelfth of the worker's total annual wages each year into an account in the worker's name. Because the worker chooses the products — deposits, funds or exchange-traded funds (ETFs) — the final payout varies with investment gains and losses.
"Workers at large companies or public institutions where pay rises with years of service and promotions, as under a seniority-based wage system, are more likely to benefit from a DB plan," the manager said. "Those at companies with annual-salary or performance-pay systems, workers with low wage growth, and those approaching a wage-peak arrangement can consider a DC plan."
Consider a worker who joins at 30, works 20 years until 50 and earns 3 million won a month in the first year. Assuming an average annual wage increase of 5% and a DC investment return of 3%, the expected retirement payout is 151.65 million won under a DB plan and 127.08 million won under a DC plan — 24.57 million won more for the DB plan.
The outcome can flip if long-term DC returns exceed wage growth. According to the 2025 Korea Retirement Pension Investment White Paper released by the Ministry of Employment and Labor and the Financial Supervisory Service, DC plans returned 8.47% last year, above the 3.53% posted by DB plans.
"If you expect your investment return to exceed your own wage growth rate over the long run, you can review switching to a DC plan," the manager said, while stressing that the decision should not rest on recent returns alone. "You need to weigh the time left until retirement, your investment style and how much loss you can absorb."
Leaving Everything in Guaranteed Products Widens the Gap
Those who choose a DC plan should also avoid the mistake of leaving the account untouched. Last year, principal-and-interest guaranteed products accounted for 75.4% of total retirement pension reserves, with performance-based products making up 24.6%. The guaranteed products returned 3.09% for the year, while performance-based products returned 16.80%.
Among DC and individual retirement pension (IRP) subscribers, the top 10% by return averaged 19.5%, with performance-based products making up 84% of their holdings. For the bottom 10%, guaranteed products accounted for 74% of holdings and returns came in at just 0.5%.
"Retirement pensions are long-term assets managed over 20 to 30 years or more, so even small differences in return turn into large gaps over time," the manager said. "You need to use performance-based products in line with your own risk tolerance and review your asset allocation periodically." The manager added that raising the share of performance-based products does not guarantee returns, so holdings of funds and ETFs that carry the risk of principal loss should be dialed back as retirement approaches.
Mixed Plans and DB-DC Choice Plans Are Not the Same
A distinction should also be drawn between mixed plans, which apply DB and DC structures together, and choice plans, which let a worker pick one of the two. A mixed plan applies both a DB and a DC structure to a single worker at a set ratio. Some companies design them at, say, 99% DB and 1% DC in order to pay performance bonuses through the DC portion.
A DB-DC choice plan lets a worker select one of two systems the company has put in place. The option is available only if the company has adopted both systems and its retirement pension rules permit switching.
When a worker moves from a DB to a DC plan, the DB retirement benefits accrued up to the switch are transferred to the DC account, and the worker manages the money from that point on. Moving in the opposite direction, from DC to DB, does not allow existing DC reserves to be shifted into the DB plan, nor can past participation be counted retroactively as DB service.
"It can be difficult to reverse a switch from a DB to a DC plan, so you should first check your company's rules and the effective date," the manager said. "The choice should weigh not only wage growth and expected returns but also your willingness and ability to manage the money yourself."
"Jung Ji-won's Money Trace" tracks the investment flows of wealthy investors through financial industry experts, following the trail of money to see where the affluent are focusing and how they allocate their assets.
