National Pension Depletion in 2071?: A Structural Analysis of the 2025 Reform Contents, Effects, and Limitations [EN]

Exploiting the Youth, or Deceiving the Public?

[Prologue: A Market Observer's Perspective]

"Having watched the National Pension debate for a long time, I have discovered a strange pattern. The moment numbers are brought up, it quickly turns into an ideological battle. If you say people need to pay more, it is labeled 'exploiting the youth.' If you say they should receive more, the term 'populism' immediately follows. Yet, attempts to coldly examine how the system itself is designed and where it is going wrong are rare. This report strips away the ideology and focuses solely on the numbers."

EXECUTIVE SUMMARY

According to the results of the 5th National Pension Financial Projection, under the current system, the accumulated fund is expected to increase until 2040, reaching a maximum of 1,755 trillion won, and the fund is projected to be maintained until 2055. However, with the passage of the National Pension Act amendment in the National Assembly plenary session on March 20, 2025, the fund depletion point has been extended by 8 years from the original 2056 to 2064 due to adjustments in the premium rate (9% → 13%) and the income replacement rate (41.5% → 43%). If the government's fund investment return rate target (4.5% → 5.5%) is achieved, the depletion point is projected to be extended to 2071. 

Amid analyses suggesting that the premium rate could soar into the 30% range upon transitioning to a pay-as-you-go system in 2080, the debate over whether this reform is a fundamental solution or merely buying time is still ongoing. This report analyzes the structural design of the National Pension, demographic and financial variables, the contents and limitations of the 2025 reform, and future scenarios based purely on facts.

01. Structure of the National Pension: How Was It Designed?

The 1988 Inception: The Promise of a 70% Income Replacement Rate

The National Pension started in 1988 with a premium rate of 3% and an income replacement rate of 70%. It was designed so that subscribers would receive 70% of their pre-retirement income as a pension. At that time, the structure of paying a 3% premium to receive 70% back was mathematically unsustainable. In the early stages, when the number of subscribers was rapidly increasing, the problem did not fully manifest, but a structural deficit was inherent from the beginning.

During the first reform in 1998, the income replacement rate was gradually lowered from 70% to 60%, and the commencement age for receiving benefits was delayed from 60 to 65. In the second reform in 2007, the replacement rate was reduced from 60% to 50%, with a built-in design to decrease by 0.5% annually thereafter to reach 40% by 2028. 

Despite these two reforms, the core of the structure remained unchanged. A structure where the payout exceeds the intake—specifically, a partial funding system—was maintained.

The Structural Implication of the Partial Funding System

Under the current National Pension system, it is difficult to pay out pension benefits equal to the premiums paid by future generations plus investment returns without the looming threat of fund depletion. 

Simplifying the current structure: A portion of the premiums paid by the current generation accumulates in a fund. Once that fund is depleted, it transitions to a pay-as-you-go system, where pensions for that year are paid out using the premiums collected in that same year. The problem is that by the time of this transition, the demographic structure will have already inverted.

02. Why a Crisis Now: The Dual Shock of Low Birth Rates and Aging

Demographic Changes by the Numbers

The 5th National Pension Financial Projection assumed a 2030 total fertility rate of 0.96, based on the 2021 Population Projections. However, the recently released 2023 Population Projections indicate the estimated total fertility rate has dropped further to 0.82. 

What this number means is unequivocal: the population that will pay into the pension system is being born in much smaller numbers than originally predicted. Forecasts suggest that reflecting the latest birth rates could advance the pension depletion point by 3 to 4 years compared to the previously estimated 2055.

On the other end, the population is aging rapidly. The demographic receiving from the fund is increasing, while the demographic paying into the fund is shrinking. The simultaneous impact of these two forces is the structural essence of the National Pension's financial crisis.

The Burden on Future Generations Upon Transition to Pay-As-You-Go

If the system transitions to a pay-as-you-go model after the fund is depleted, the premium rate is estimated to skyrocket to the 30% range by 2080. Future generations would be forced to pay roughly 30% of their income solely to fund the pensions of the elderly.

The variable that has a significant impact on the time of fund depletion is the investment return rate. A 0.5%p increase in the fund's investment return rate delays depletion by 2 years, while a 1%p increase extends it by 5 years. This carries the same financial effect as raising the premium rate by 2%p.

03. The 2025 Pension Reform: What Has Changed?

Core Contents of the Reform Bill

On March 20, 2025, the amendment to the National Pension Act passed the National Assembly's plenary session. This marks the first pension reform in 18 years, since 2007.

Premium & Replacement Rates

The premium rate will increase from 9% to 13%, rising gradually by 0.5%p annually starting in 2026 until it reaches 13% in 2033. The income replacement rate will be raised to 43% all at once starting in 2026. 

State Guarantee

The state's obligation to guarantee the stable and continuous payment of pension benefits was explicitly stipulated in the law.

Credits

The childbirth credit was expanded to 12 months for the first child, and the previous 50-month upper limit was abolished. The military service credit was expanded from 6 months to a maximum of 12 months.

Financial Effects of the Reform

With a 13% premium rate and a 43% income replacement rate, the fund is projected to be maintained until 2071—a 15-year extension compared to the previous projection of 2056. The accumulated deficit is expected to decrease by 6,973 trillion won in nominal terms.

Assuming an average National Pension earner (monthly income of 3.09 million won) subscribes for 40 years and receives the pension for 25 years, they will pay approximately 180 million won and receive 310 million won over their lifetime. Compared to before the reform, total premiums increase by 54 million won, while total pension benefits increase by approximately 22 million won.

04. The Debate Surrounding the Reform: Arguments from Each Side

(This section does not support any specific position and summarizes the rationale of each argument based strictly on facts.)

Arguments from Reform Supporters

Pension experts analyze that because there is no retroactive application of the income replacement rate increase for those aged 60 and older, the effect of the increase actually has a greater positive impact on the 2030 generation. They explain that the 2030 generation is still operating within a structure where they receive more money back than they contribute. 

Additionally, supporters argue that extending the fund's depletion by 15 years is the best realistically achievable outcome compared to taking no action at all. The explicit stipulation of a state payment guarantee is also evaluated as a necessary measure to boost public trust in the system.

Arguments from Reform Critics

Former People Power Party leader Han Dong-hoon criticized the reform, stating, "It is a structure where the older generation benefits at the expense of the youth." Representative Lee So-young stated, "I cannot agree to a reform plan that fails to improve financial stability and generational equity." Representative Jang Chul-min pointed out, "The chronic deficit structure remains unresolved, and the burden is simply passed onto younger generations." 

Representative Jeon Jong-deok raised concerns about institutionalizing low pensions: "An income replacement rate of 43% means that even if an average earner subscribes for 40 years, they will only receive 1.32 million won a month, which falls short of the minimum monthly living expense for old age of 1.36 million won." 

Furthermore, the youth generation in their 20s and 30s formed a national university student council coalition to voice opposition to the reform. Their primary argument was that collectively raising the premium rate by 0.5% for all generations over the next 8 years forces a unilateral sacrifice upon the younger generation.

Arguments for Structural Reform

The Korea Development Institute (KDI) warned that simply adjusting parameters without underlying structural reform could trigger generational equity issues even as the fund depletion point is delayed. Notably, they analyzed that given the severity of the low birth rate, there is a fundamental limit to how much parametric adjustments can alleviate generational inequity within the current structure, where a relatively small cohort of young people must support a massive elderly population.

05. Remaining Tasks: The Automatic Adjustment Mechanism and Structural Reform

What is an Automatic Adjustment Mechanism?

Currently, 24 countries, including Germany and Japan, have introduced an automatic adjustment mechanism. This system allows for the financial balance of the pension to be maintained dynamically without recurring political controversy. The government estimates that introducing this mechanism could delay the fund depletion point by more than 30 years. However, because it can entail a reduction in pension payouts, it is highly controversial socially.

During the 2025 reform process, the ruling and opposition parties failed to reach an agreement on its introduction. A political compromise was reached whereby the Democratic Party accepted the 43% income replacement rate, while the government and ruling party agreed to postpone the introduction of the automatic adjustment mechanism.

KDI's Proposal for a 'New Pension'

Considering generational equity, KDI proposed the introduction of a fully funded "New Pension" that guarantees the payment of pension benefits equal to the premiums paid by future generations plus investment returns, completely removing the risk of fund depletion. They suggested that for premiums paid *before* this transition, the promised pension should be paid as a defined-benefit type ("Old Pension"). The ensuing financial shortfall of this Old Pension would need to be separated from the New Pension and covered by general government revenues.

06. Generational Profit and Loss Structure: Reality in Numbers

Pre-1988 Subscribers (Currently in their 60s-70s)

Subscribed during the era of a 60–70% income replacement rate. This generation is overwhelmingly advantaged in terms of the ratio of money received to money paid. Due to increasing life expectancies, their payout periods have also extended significantly beyond initial expectations.

Born in the 1980s-1990s (Currently in their 30s-40s)

Based on an office worker in their 20s with a monthly salary of 3.09 million won, they will pay 50 million won more in premiums under the new rules and receive 20 million won more in pension. They still receive more than they pay in, but the net benefit has narrowed drastically compared to previous generations.

Born after the 2000s (Currently in their 10s-20s)

This is the generation that will directly bear the heaviest burden if the system transitions to a pay-as-you-go method after fund depletion. A survey of 1,003 adults showed that 31% of respondents agreed with arguments to abolish the pension entirely.

07. Scenario Analysis

Scenario 1 — Parametric Reform Effect Realized (Baseline Scenario)

With a 13% premium rate, 43% income replacement rate, and achievement of a 5.5% fund return target, the fund depletes in 2071. Afterwards, it transitions to a pay-as-you-go system, imposing a considerable premium burden on future generations.

Scenario 2 — Worsening Low Birth Rate + Return Rate Shortfall

If the latest declining birth rates are heavily factored in, fund depletion could advance by 3 to 4 years. If the fund return rate misses its target, the depletion timeline will contract even further.

Scenario 3 — Introduction of an Automatic Adjustment Mechanism

 Government estimates suggest this could delay depletion by over 30 years. However, as it entails a reduction in benefit amounts, robust social consensus is a strict prerequisite.

Scenario 4 — Structural Reform (New Pension System)

Transitioning to a fully funded system would significantly improve generational equity. However, the present value of the unfunded liability of the 'old pension' during the transition process sits at roughly 609 trillion won (26.9% of GDP as of 2024), requiring massive injections of general government finances.

Conclusion: Parametric Reform is the Beginning, Not the End

The 2025 reform is a tangible achievement 18 years in the making. Simultaneously, it is widely evaluated as incomplete.

While it delayed fund depletion by 15 years, the underlying structural deficit remains unresolved. Consensus on the automatic adjustment mechanism failed. Discussions regarding true structural reform have been kicked down the road to the next special pension committee.

The National Pension issue is no longer about prioritizing the interests of any specific generation. It is a mathematical question of how to adapt the system to match the brutal speed of demographic shifts. The numbers already point toward the required direction. How quickly, and how equitably, we move in that direction remains the ultimate task.

This report was compiled based on official data from the Ministry of Health and Welfare, the National Pension Financial Projection Expert Committee, KDI, and the National Assembly Budget Office. It does not support any specific political party or stance, and System View's objective is purely structural analysis.