Korea Inheritance Tax Guide: Rates, Deductions & Strategies

Korea has one of the highest inheritance tax rates among OECD countries, with a top marginal rate of 50%. For families with significant assets, inheritance tax can consume a substantial portion of the estate if not planned carefully. Yet many people only think about it after a family member passes away—when it's often too late to optimize. This guide covers everything you need to know: how Korean inheritance tax works, the 2026 tax rate table, all major deductions, 5 practical tax-saving strategies, and real calculation examples.

What Is Korean Inheritance Tax?

Inheritance tax (상속세) is a tax levied when property is transferred for free due to death. The taxpayer is the heir (상속인), not the deceased. The tax return must be filed within 6 months from the end of the month in which the death occurred. Late filing results in penalties of 10–40% of the tax due, so timely action is critical.

• Taxpayer: The heir(s) who receive the inherited property.
• Tax base: Total inherited assets + prior gifts (within 10 years) − debts − funeral expenses − deductions.
• Filing deadline: Within 6 months from the last day of the month of death.
• Penalty for late filing: 10% general penalty + up to 40% for underreporting.

2026 Inheritance Tax Rate Table

Korean inheritance tax uses a 5-bracket progressive system. The rate ranges from 10% on the first 100 million KRW to 50% on amounts exceeding 3 billion KRW. The progressive deduction simplifies calculation: Tax = Tax Base × Rate − Progressive Deduction.

• Up to 100M KRW: 10% (progressive deduction: 0)
• 100M–500M KRW: 20% (progressive deduction: 10M)
• 500M–1B KRW: 30% (progressive deduction: 60M)
• 1B–3B KRW: 40% (progressive deduction: 160M)
• Over 3B KRW: 50% (progressive deduction: 460M)

How Inheritance Tax Is Calculated

The calculation follows a clear step-by-step process:

• Step 1: Total inherited assets (real estate, financial assets, other property at market value).
• Step 2: Add prior gifts to heirs within 10 years before death.
• Step 3: Subtract debts and funeral expenses → Taxable value.
• Step 4: Apply deductions (basic/lump-sum, spouse, financial assets, etc.) → Tax base.
• Step 5: Apply progressive tax rates → Calculated tax.
• Step 6: Subtract filing deduction (3% for timely filing) → Final tax payable.

Major Deduction Items

Understanding and maximizing deductions is the single most effective way to reduce inheritance tax. Here are the key deductions available:

• Basic Deduction (기초공제): 200 million KRW flat deduction for all estates.
• Lump-Sum Deduction (일괄공제): 500 million KRW. If basic + personal deductions total less than 500M, the lump-sum is applied instead. Most estates use this.
• Personal Deductions (인적공제): 50M per child, additional 10M × years until age 19 for minors, 50M per lineal ascendant aged 60+, 10M × life expectancy for disabled dependents.
• Spouse Deduction (배우자공제): Minimum 500M, maximum 3 billion KRW, based on actual inheritance amount within the legal share. Legal share = Spouse 1.5 : Child 1 ratio.
• Financial Asset Deduction (금융재산공제): Up to 200M KRW. For net financial assets up to 20M, full deduction; above 20M, the greater of 20% or 20M, capped at 200M.
• Cohabitation Housing Deduction (동거주택 상속공제): Up to 600M KRW for a home where the heir lived with the deceased for 10+ years.

5 Tax-Saving Strategies

• 1. Optimize Spouse Inheritance Allocation: Maximize the spouse deduction (up to 3B KRW) by allocating the right amount to the spouse within the legal share. This alone can reduce tax by hundreds of millions of won.
• 2. Use Lifetime Gifts Strategically: The gift tax exemption resets every 10 years—50M for spouse, 50M per adult child, 20M per minor child. Systematic gifting over decades can transfer significant wealth tax-efficiently.
• 3. Leverage Family Business Succession Deduction: Business owners may qualify for deductions of 200M–500B KRW if the heir continues the business for 10+ years. Requires advance planning and strict conditions.
• 4. Balance Financial vs. Real Estate Assets: Financial assets qualify for up to 200M in additional deductions. Shifting some wealth from real estate to financial products before inheritance can reduce the tax base.
• 5. File On Time for the 3% Deduction: Filing within 6 months saves 3% of the calculated tax. On a 500M tax bill, that's 15M KRW saved simply by meeting the deadline.

Real Examples

Example 1: Total estate 1 billion KRW, spouse + 2 children. Taxable value: 1B. Lump-sum deduction 500M + spouse deduction 500M = total deductions 1B. Tax base: 0. Inheritance tax: 0 KRW.

Example 2: Total estate 2 billion KRW, spouse + 1 child. Taxable value: 2B. Lump-sum deduction 500M + spouse deduction ~1.2B (legal share) = total deductions ~1.7B. Tax base: ~300M. Tax: ~50M before filing deduction. This shows how deduction optimization can dramatically reduce the burden.

Recent Issues & Proposed Reforms

The Korean government has proposed reducing the top inheritance tax rate from 50% to 40% and increasing the child deduction from 50 million to 500 million KRW per child. However, these changes have not yet passed the National Assembly as of March 2026. Until the law is amended, all calculations should be based on the current rates. Monitor legislative developments and adjust your planning accordingly.

Korean inheritance tax is complex but manageable with proper understanding and advance planning. The key takeaways: (1) Know your deductions—they can reduce or eliminate the tax entirely for estates under 1 billion KRW. (2) Start gifting early to take advantage of the 10-year exemption cycle. (3) Always file on time for the 3% deduction. (4) Use the QuickFigure Inheritance Tax Calculator to model scenarios before consulting a tax professional.