📈 Japan & Korea Dividend + Salary Combined Tax Calculator (NISA, Dividend Credit & ₩20M Threshold)
See how your tax changes when combining Dividends & Interest with Salary or Freelance income: compares Japan’s 20.315% Separate Tax, Comprehensive Tax Credit (配当控除), and NISA against Korea’s ₩20,000,000 Financial Income Comprehensive Tax.
📌 Dividend + Salary Combined Tax — 핵심 요약 (Key Takeaways)
- 🇯🇵 Japan: Dividends in a taxable account have 20.315% withheld, but if your combined taxable income is under ¥6.95M, filing under Comprehensive Taxation (総合課税 with 10% Dividend Credit) can refund overpaid tax! (New NISA is 0% tax).
- 🇰🇷 Korea: Annual interest + dividends up to ₩20,000,000 are taxed at a final 15.4%. Any amount over ₩20,000,000 is combined with your salary/business income at progressive rates (up to 49.5% incl. local tax).
- Includes a step-by-step simulation table showing where the tax cliff begins as dividend income grows.
📖 How the Formula Works & Official Terminology (with Local Terms)
- Japan 3-Way Comparison: Compares ① No-Filing Separate Withholding (20.315%), ② Comprehensive Filing with Dividend Tax Credit (配当控除: 10% national + 2.8% resident credit), and ③ New NISA (0% tax).
- Korea Combined Taxation (금융소득종합과세): Taxes the first ₩20M at 15.4%, applies 11% Gross-up to excess domestic dividends, combines with earned/business taxable income, and deducts the dividend tax credit.
📊 Sample Salary & Tax Reference Table by Income Bracket
| Country & Rule | Annual Dividends | Upfront Withholding | Impact When Combined with Salary | Optimal Choice |
|---|---|---|---|---|
| 🇯🇵 Japan (New NISA) | ¥1,000,000 | 0% Tax-Free | ¥0 tax, zero impact on resident tax | Maximize NISA allowance first |
| 🇯🇵 Japan (Taxable ≤¥6.95M) | ¥1,000,000 | 20.315% (¥203,150) | Tax refund via 10% Dividend Credit (配当控除) | File Comprehensive Return (確定申告) |
| 🇰🇷 Korea (≤₩20,000,000) | ₩15,000,000 | 15.4% Final | ₩0 extra tax (not combined with salary) | No May filing required |
| 🇰🇷 Korea (>₩20,000,000) | ₩35,000,000 | 15.4% Withheld | Excess ₩15M taxed at progressive salary bracket | Keep annual financial income ≤₩20M |
❓ Frequently Asked Questions (FAQ)
🏛️ Official Government Citations & Revision Schedule
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National Tax Service of Korea (국세청) —
Wage Withholding Table, Progressive Tax Brackets, Foreigner 19% Flat Rate & Dividend Tax
Official Rule Verification Date: 2026-11-04 | 매년 1~2월 세법 시행령 개정 및 3월 간이세액표 반영 / 5월 종합소득세 (1·2·3·5월 점검)
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National Tax Agency of Japan (国税庁) —
2026/2027 Withholding Tax Tables & Computer Formula (源泉徴収税額表)
Official Rule Verification Date: 2026-11-04 | 매년 9월 차년도 표 공개 → 1월 급여부터 적용 (1월·9월 중점 점검)
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Ministry of Internal Affairs and Communications (総務省) —
Individual Resident Tax (住民税) & Forest Environment Tax System
Official Rule Verification Date: 2026-11-04 | 매년 6월 신규 연도 주민세 부과 시작 (5월·6월 중점 점검)
Calculations, schedules, and guides on HonsMoney are approximate estimates and may differ from your actual tax or insurance amounts due to individual circumstances, municipal rules, visa status, or law revisions. This site does not provide tax or legal advice. Always verify final figures and deadlines directly with your local Tax Office (税務署 / NTS), Municipal Office (役所), Pension Service (年金事務所 / NPS), or your employer’s HR/payroll department.
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