In South Korea, if your annual interest and dividend income exceeds KRW 20 million (approx. USD 15,000), you must file a comprehensive income tax (종합소득세) by May 31, 2026 for the 2025 tax year.
Why This Matters for Investors
Exceeding KRW 20 million by even one won means your entire financial income is merged with other income (salary, business) and taxed at progressive rates up to 49.5% (including local tax). For context, income below KRW 20 million faces a flat 15.4% withholding tax.
Three Tax Minimization Strategies
- ISA Account: Returns inside a Korean ISA are excluded from the KRW 20M threshold entirely. Annual tax-free allowance: KRW 2 million (general type), excess taxed at just 9.9%.
- Pension Savings (연금저축) + IRP: Up to KRW 9M in annual contributions yields a direct tax credit up to KRW 1.485 million. Earnings grow tax-deferred.
- ISA-to-Pension Rollover Bonus: Rolling a matured ISA into pension adds up to KRW 3M in extra tax credit — raising total deductible headroom to KRW 12 million.
Action Before May 31
Log into Hometax, check your 2025 total financial income, open an ISA if you have not already, and confirm pension contributions are reflected in your tax filing.
For the full analysis and step-by-step checklist in Korean, visit Snakestock.
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