South Korea Considers Health Insurance Premium Hikes Amid Projected Deficits

Approximately 1.78 million salaried employees in South Korea face higher health insurance premiums due to income earned outside their primary salaries, according to data from the National Health Insurance Service (NHIS). The South Korean government is reviewing these adjustments as the national health insurance fund faces a projected transition into a deficit.

Under current regulations, employees who earn more than 20 million won annually from sources other than their monthly salary—such as rental income, interest, or dividends—must pay an additional “income-based premium” (소득월액보험료). This system ensures that individuals with significant diversified wealth contribute to the healthcare system proportionally to their total income, rather than just their employment wages.

The 20 Million Won Threshold and Premium Hikes

The NHIS applies the additional premium to any non-salary income exceeding the 20 million won annual threshold. For the current cycle, the agency identified 1.78 million workers who met or exceeded this limit. These individuals will see an increase in their monthly contributions based on the specific amount of their extra earnings.

The calculation for this additional premium is based on the total non-salary income minus the 20 million won deduction, multiplied by the current health insurance premium rate. According to the National Health Insurance Service, these adjustments are necessary to maintain the equity of the contribution system, preventing high-earners with multiple income streams from underpaying relative to their actual financial capacity.

Financial Pressure on the National Health Insurance Fund

The push to tighten premium collections comes as the South Korean government grapples with the long-term sustainability of the health insurance system. The Ministry of Health and Welfare has signaled that the fund is moving toward a deficit, driven by an aging population and the increasing cost of advanced medical treatments.

To combat this projected shortfall, the government is reviewing broader premium increases and stricter enforcement of income reporting. The shift toward a deficit is exacerbated by the “silver tsunami”—the rapid increase in the elderly population who require more frequent and expensive medical care—which places a heavier burden on the working-age population’s contributions.

Impact on Diversified Income Earners

The 1.78 million affected employees typically include those with significant real estate holdings, high-yield investment portfolios, or secondary business ventures. While the primary salary premium is deducted automatically by employers, the income-based premium is billed directly to the individual by the NHIS.

Financial analysts note that this policy targets “hidden” wealth. By linking premiums to total income rather than just wages, the government aims to close loopholes where wealthy individuals might maintain a modest official salary while earning millions through dividends or rent. This alignment is part of a broader effort to ensure the Ministry of Health and Welfare can sustain universal coverage without drastic tax hikes.

Comparison of Contribution Structures

The South Korean health insurance system distinguishes between “workplace subscribers” (직장가입자) and “local subscribers” (지역가입자). Workplace subscribers generally have their premiums split 50/50 with their employer. However, the income-based premium for non-salary earnings is paid entirely by the employee.

For those who exceed the 20 million won threshold, the payment structure shifts from a simple percentage of salary to a dual-layered system:

• Salary Premium: Based on monthly wages, shared with the employer.
• Income-based Premium: Based on additional annual income over 20 million won, paid 100% by the employee.

This structure prevents a scenario where a CEO with a nominal salary of 2 million won but 1 billion won in dividends pays the same premium as a mid-level manager with the same 2 million won salary and no other income.

Next Steps for Affected Subscribers

The NHIS typically notifies affected individuals via mail or digital portals once the tax data from the National Tax Service is synchronized. Subscribers who believe their income has decreased or who have disposed of income-generating assets can apply for a premium adjustment by submitting proof of income change to the NHIS.

The government’s review of further premium hikes remains ongoing. The next official update regarding the health insurance fund’s financial status and potential rate adjustments for the coming year is expected during the annual budget deliberation process in the National Assembly.

Readers are encouraged to share this report and leave comments regarding their experiences with health insurance adjustments in the comments section below.