One-Person Corporation & Micro Corporation

Japan's micro corporation (マイクロ法人) is a one-person company established not for business expansion but for 'tax optimization and social insurance cost reduction.'

Freelancers and sole proprietors receive part of their business income as corporate salary to minimize social insurance premiums while utilizing the lower corporate tax rate.

Why micro corporations thrive in Japan

The key lies in Japan's social insurance structure.

Individual business owners pay National Health Insurance + National Pension, where premiums scale with income with high caps.

However, as a corporate representative with minimum salary (e.g., 60,000 yen/month), health insurance + employee pension premiums can be minimized, and employee pension pays out more than national pension — enabling a 'pay less, receive more' structure.

Three reasons micro corporations don't exist in Korea

Reason 1: Health insurance gap isn't dramatic

The premium gap between employee and regional subscribers in Korea isn't as large as in Japan. The structural advantage of reducing premiums simply by incorporating is weaker.

Reason 2: Pension structure differences

Korea's National Pension at 9% of income is relatively simple, and the payout difference isn't as significant as Japan's national vs. employee pension gap.

Reason 3: Tax audit risk

Korea's National Tax Service conducts intensive audits on one-person corporations, and setting abnormally low CEO salaries carries tax risks.

While micro corporations are an established practice in Japan with tax accountants actively recommending them, Korean tax accountants often warn that 'one-person corps are audit targets.'

Conclusion

In Japan, even freelancers earning around 5 million yen annually commonly establish micro corporations.

In Korea, one-person incorporation is mainly limited to high-revenue businesses or those needing external credibility.