Inheritance Tax Calculator - Estate Tax by Country

What Is Inheritance Tax and Why Does It Matter?

Inheritance tax — also called estate tax or death duty depending on the jurisdiction — is a levy imposed on the transfer of assets from a deceased person to their heirs. While the terms are sometimes used interchangeably, there is a technical distinction: an estate tax is assessed on the total value of the deceased's estate before distribution, whereas an inheritance tax is levied on the individual beneficiary based on what they receive. Understanding which system applies in your country is the first step toward accurate tax planning.[10]

Inheritance and estate taxes are among the oldest forms of taxation, yet they remain one of the most debated. According to the OECD Revenue Statistics 2024, taxes on property — including estate and inheritance levies — account for roughly 1% to 2% of total tax revenue across OECD member nations. Despite their relatively small revenue contribution, these taxes serve important policy goals: reducing wealth concentration across generations, funding public services, and encouraging charitable giving through deduction incentives.[11]

The practical impact of inheritance tax depends heavily on the exemption threshold in each jurisdiction. In some countries, such as the United States, only a small fraction of estates owe any federal tax because the exemption is set very high. In others, such as South Korea and Japan, lower thresholds mean a larger share of estates are subject to taxation. Knowing where your estate falls relative to these thresholds is critical for determining whether proactive tax planning is warranted.[3, 1]

How Progressive Tax Brackets Work for Inheritance Tax

Most countries that levy inheritance or estate tax use a progressive bracket system, meaning the tax rate increases as the value of the taxable estate rises. Under a progressive structure, only the portion of the estate within each bracket is taxed at that bracket's rate — not the entire estate. This is the same mechanism used in income taxes: crossing into a higher bracket does not retroactively increase the tax on the lower portions.[12]

Consider South Korea's inheritance tax as an example. The Korean National Tax Service (NTS) applies five brackets ranging from 10% on the first KRW 100 million (approximately USD 75,000) to 50% on amounts exceeding KRW 3 billion (approximately USD 2.25 million). If an estate is valued at KRW 2 billion after deductions, the heir does not pay 40% on the entire amount. Instead, the first KRW 100 million is taxed at 10%, the next KRW 400 million at 20%, the next KRW 500 million at 30%, and the remaining KRW 1 billion at 40%.[1, 2]

The marginal rate is the rate applied to the last dollar (or won, euro, yen) of the taxable estate — it represents the highest bracket the estate reaches. The effective rate is the total tax divided by the total taxable value, and it is always lower than the marginal rate for estates that span multiple brackets. This distinction is crucial: many people overestimate their tax burden by confusing the marginal rate with the overall effective rate.[12]

Japan offers another clear illustration. The Japan National Tax Agency (NTA) levies inheritance tax using eight brackets from 10% to 55%, with the top rate applying to inherited amounts exceeding JPY 600 million. A taxable inheritance of JPY 100 million would face a marginal rate of 30% (the fourth bracket), but the blended effective rate works out to approximately 23% after the lower brackets are applied to the initial portions.[8, 9]

Inheritance Tax by Country: Comparing KR, US, DE, and JP

South Korea levies one of the highest inheritance tax rates among OECD countries. The Korean NTS applies five progressive brackets: 10% on the first KRW 100 million, 20% on KRW 100M–500M, 30% on KRW 500M–1B, 40% on KRW 1B–3B, and 50% on amounts exceeding KRW 3 billion. A basic deduction of KRW 200 million (about USD 150,000) applies to most estates, with additional deductions available for spouses and minor children. Korea's high top rate has prompted ongoing legislative debate about potential reductions to improve economic competitiveness.[1, 2]

The United States uses a federal estate tax system rather than an inheritance tax. Under the One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, the federal estate and gift tax exemption was permanently raised to $15 million per individual for 2026 — up from $13.99 million in 2025. This exemption, confirmed by IRS Revenue Procedure 2025-32, carries no sunset provision, unlike the prior TCJA increase that was scheduled to expire at the end of 2025. The high exemption means fewer than 0.1% of estates owe any federal estate tax. Estates exceeding the exemption face a top marginal rate of 40%. The exemption is portable between spouses, allowing a married couple to shield up to $30 million combined.[21, 22, 3, 5]

Germany's Erbschaftsteuer (inheritance and gift tax) is governed by the Erbschaftsteuer- und Schenkungsteuergesetz (ErbStG). The Federal Central Tax Office (BZSt) administers the tax, which uses seven brackets ranging from 7% to 30% for close relatives (Tax Class I) and up to 50% for unrelated persons (Tax Class III). The tax-free allowance (Freibetrag) varies by relationship: spouses receive EUR 500,000, children EUR 400,000, and grandchildren EUR 200,000. These generous allowances for close family members mean that moderate-sized estates within the family often owe no tax at all.[6, 7]

Japan's inheritance tax, administered by the National Tax Agency (NTA), uses eight brackets from 10% to 55% — giving it the highest top rate among major economies. The basic deduction is calculated as JPY 30 million plus JPY 6 million per statutory heir. For a family with one surviving spouse and two children (three heirs), the basic deduction totals JPY 48 million (approximately USD 320,000). Japan's system taxes each heir's share individually after applying the basic deduction to the estate total, which can produce different effective rates depending on how the estate is divided.[8, 9]

An OECD comparative analysis shows that among the four countries, top statutory rates range from 40% (US) to 55% (Japan), but effective rates vary dramatically due to differing exemption levels and deduction structures. The United States exempts the vast majority of estates through its high unified credit, while South Korea and Japan subject a broader share of estates to taxation with comparatively lower thresholds. Germany falls in between, with moderate rates but relationship-tiered allowances that shield most family transfers.[10, 11]

Filing Requirements and Deadlines for Inheritance Tax Returns

In the United States, estates exceeding the federal exemption threshold must file IRS Form 706 (United States Estate and Generation-Skipping Transfer Tax Return) within nine months of the decedent's date of death, with a six-month automatic extension available upon request. Even estates below the exemption threshold should consider filing Form 706 to elect portability of the deceased spousal unused exclusion (DSUE) amount — failure to make this election is irrevocable and could cost the surviving spouse up to $15 million in additional exemption. The executor must also report the estate's assets at fair market value on the date of death, or may elect an alternate valuation date six months later under IRC Section 2032.[19, 20]

South Korea requires heirs to file an inheritance tax return within six months of the date of death, or within nine months if the decedent or heirs reside overseas. The Korean NTS mandates that heirs jointly file a single return covering the entire estate. Payment is due at the time of filing, though installment payments (up to five years, or up to ten years for inherited business assets) may be approved if the tax exceeds KRW 10 million. Heirs who fail to file within the deadline face penalty surcharges of 20% of the unpaid tax, with additional daily interest accruing at the prevailing statutory rate.[1]

Germany does not use a self-assessment system for inheritance tax. Instead, heirs are required to notify the local Finanzamt (tax office) of their inheritance within three months of learning about it, as stipulated by Section 30 of the Erbschaftsteuer- und Schenkungsteuergesetz (ErbStG). The Finanzamt then issues a Steuerbescheid (tax assessment notice) based on reported asset values and applicable rates. Heirs have one month to object to the assessment. Interest on unpaid tax begins accruing 15 months after the date of death. The valuation of real estate follows the Bewertungsgesetz (BewG), which can produce assessed values significantly different from market prices — professional appraisals are advisable for high-value properties.[6]

Japan requires all heirs to file an inheritance tax return and pay the tax due within ten months of the decedent's date of death. The National Tax Agency (NTA) requires that all statutory heirs file jointly, even if some heirs receive no assets. If the estate's total value exceeds the basic deduction (JPY 30 million + JPY 6 million per statutory heir), a return must be filed regardless of whether any tax is owed after applying credits. Late filing triggers a penalty of 15–20% of the underpaid amount, with additional delinquency tax accruing daily. Japan's system uniquely requires each heir to calculate tax on a hypothetical statutory share before redistributing the total tax burden according to actual allocations.[8, 9]

Common Deductions and Exemptions Across Countries

Every inheritance tax system provides deductions and exemptions designed to protect surviving family members and prevent forced liquidation of family assets. In South Korea, the NTS provides a basic deduction of KRW 200 million, a spousal deduction of up to KRW 3 billion (or the actual inheritance amount, whichever is lower), and additional deductions for minor children, elderly dependents, and persons with disabilities. The lump-sum deduction (일괄공제) of KRW 500 million is often chosen when the sum of individual deductions is smaller, effectively raising the floor for most middle-class estates.[1, 2]

In the United States, the IRS Publication 559 outlines the key deductions available for estate tax purposes. The marital deduction allows unlimited transfers to a surviving U.S. citizen spouse without triggering estate tax. The charitable deduction excludes bequests to qualified charitable organizations from the taxable estate. Additionally, administrative expenses, debts owed by the decedent, and funeral costs are all deductible. The portability provision enables a surviving spouse to claim any unused portion of the deceased spouse's estate tax exemption by filing a timely estate tax return.[4, 5]

Germany's Freibeträge (tax-free allowances) are among the most generous in Europe for direct family members. Under the ErbStG, the BZSt grants allowances that reset every 10 years: EUR 500,000 for spouses, EUR 400,000 per child, EUR 200,000 per grandchild, and EUR 100,000 for parents inheriting from a child. Surviving spouses also receive a pension benefit deduction (Versorgungsfreibetrag) of up to EUR 256,000. The family home exemption can fully exempt a residential property from Erbschaftsteuer if the surviving spouse or children continue to live in it for at least 10 years.[7, 6]

Japan's deduction system centers on the basic deduction formula: JPY 30 million + (JPY 6 million × number of statutory heirs). The NTA also provides a spousal tax credit that effectively exempts the greater of JPY 160 million or the spouse's statutory share from taxation. Life insurance proceeds receive a separate exemption of JPY 5 million per statutory heir, and retirement benefits paid to the estate enjoy the same JPY 5 million per heir exemption. For estates that include small and medium-sized businesses, special valuation rules can reduce the assessed value of business assets by up to 80% if the heir continues operating the business.[9, 8]

How Estate Assets Are Valued for Inheritance Tax

The foundation of every inheritance tax calculation is the valuation of estate assets. In most jurisdictions, the standard is fair market value (FMV) — the price a willing buyer would pay a willing seller, with both parties having reasonable knowledge of the relevant facts. In the United States, the IRS (Publication 559) requires that all assets be valued at FMV on the date of death, though the executor may elect the alternate valuation date (six months after death) under IRC Section 2032 if it reduces both the gross estate value and the estate tax liability.[4]

Closely held business interests present the most complex valuation challenges. In the United States, IRS Revenue Ruling 59-60 establishes the framework for valuing businesses with no publicly traded shares — factors include earnings history, dividend-paying capacity, book value, the company's position in its industry, and the economic outlook. Minority interest and lack-of-marketability discounts can legitimately reduce the taxable value by 20–40%. In South Korea, the NTS applies a supplementary valuation method for unlisted shares that blends net asset value and weighted-average earnings, often producing values below what a willing buyer would pay in an arm's-length transaction.[3, 1]

Publicly traded securities are generally straightforward to value: the IRS accepts the mean between the high and low selling prices on the date of death. Life insurance proceeds payable to the estate (or to the estate as beneficiary) are included in the gross estate at face value. Retirement accounts — 401(k)s, IRAs, and pensions — are valued at the account balance on the date of death and are included in the taxable estate, though beneficiaries who inherit these accounts may owe income tax on distributions in addition to any estate tax paid. The interaction between estate tax and income tax on retirement accounts makes these assets particularly expensive to transfer without advance planning.[4, 18]

Several countries offer special-use valuations that can dramatically reduce the assessed value of qualifying assets. In the United States, IRC Section 2032A allows farms and closely held businesses to be valued based on their actual use rather than highest-and-best-use, potentially reducing the taxable value by up to $1.39 million (2026, indexed for inflation). In Germany, the Betriebsvermögensbegünstigung under the ErbStG can exempt 85% or even 100% of qualifying business assets if the heir maintains the business and employment levels for five to seven years. Japan's small-scale residential land special valuation (小規模宅地等の特例) remains one of the most powerful deductions globally, reducing the taxable value of qualifying residential land by up to 80% — a provision that can save heirs tens of millions of yen on the family home.[8, 6]

State-Level Estate and Inheritance Taxes in the United States

While the federal estate tax dominates public discussion, state-level taxes add a critical layer of complexity for U.S. estates. As of 2026, twelve states plus the District of Columbia impose their own estate taxes, and six states levy a separate inheritance tax. Maryland is the only state that imposes both. These state taxes can apply even when no federal tax is owed, because many states set exemption thresholds far below the federal level. An estate worth $5 million, for example, owes zero federal estate tax under the $15 million OBBBA exemption but could face significant state estate tax in states like Oregon (exemption: $1 million) or Massachusetts (exemption: $2 million).[13, 3]

States with estate taxes and their approximate 2026 exemption thresholds include Connecticut (matches the federal exemption), Hawaii ($5.49 million), Illinois ($4 million), Maine ($6.8 million), Maryland ($5 million), Massachusetts ($2 million), Minnesota ($3 million), New York ($7.16 million), Oregon ($1 million), Rhode Island ($1.77 million), Vermont ($5 million), Washington ($2.193 million), and the District of Columbia ($4.71 million). State estate tax rates typically range from 0.8% to 20%, with Washington imposing the highest maximum rate. Massachusetts and Oregon stand out as particularly impactful for moderate estates because their low thresholds bring a wider range of families into the tax base.[13]

Six states impose an inheritance tax, which is levied on the beneficiary rather than the estate: Iowa (being phased out by 2025), Kentucky, Maryland, Nebraska, New Jersey, and Pennsylvania. Rates and exemptions depend on the beneficiary's relationship to the decedent. In most of these states, transfers to a surviving spouse are fully exempt, and transfers to children receive either full exemption or substantially reduced rates. Transfers to non-relatives, however, can face rates as high as 15–18%. New Jersey is notable for exempting transfers to direct descendants entirely while taxing siblings and other beneficiaries at rates up to 16%.[13, 14]

State-level tax planning implications are significant. Domicile selection matters — retirees who move from a state with an estate tax to one without (such as Florida or Texas) can eliminate state-level estate tax entirely, though the original state may still have claims on real property located within its borders. For estates with real property in multiple states, ancillary probate may be required in each state, potentially subjecting the same assets to different tax regimes. Multi-state planning often involves creating revocable trusts to hold out-of-state real property, thereby avoiding ancillary probate and potentially reducing state tax exposure. Consultation with an estate planning attorney licensed in the relevant states is essential for estates approaching any state-level exemption threshold.[18, 13]

Estate Planning Strategies to Minimize Inheritance Tax

Lifetime gifting is one of the most effective strategies for reducing the taxable estate. In the United States, the IRS allows an annual gift tax exclusion of $19,000 per recipient (2026), meaning a married couple can give $38,000 to each child, grandchild, or other individual every year without reducing their lifetime estate tax exemption. With the OBBBA permanently raising the lifetime exemption to $15 million, the combined effect of annual exclusion gifts and a higher lifetime exemption creates significant planning flexibility. Over decades, systematic annual gifting can transfer substantial wealth outside the taxable estate while also shifting future appreciation out of the estate.[15, 23, 3, 5]

South Korea also permits tax-free gifts, but with stricter limits. Under Korean tax law, the gift tax exemption is KRW 50 million (approximately USD 37,500) per recipient from a direct-line relative over a 10-year period, and KRW 10 million from other relatives. Because the gift and inheritance tax rates share the same progressive bracket structure, strategic gifting over multiple 10-year cycles can effectively split a large estate into smaller taxable amounts, each taxed at lower marginal rates. The NTS tracks cumulative gifts to prevent abuse, so careful documentation and timing are essential.[16, 1]

In the United States, trusts are a cornerstone of estate planning. An irrevocable life insurance trust (ILIT) removes life insurance proceeds from the taxable estate. A grantor retained annuity trust (GRAT) allows the transfer of appreciating assets at a reduced gift tax cost. Charitable remainder trusts (CRTs) provide income to the grantor during their lifetime while ultimately directing assets to a charity, producing both an income tax deduction and estate tax reduction. The IRS Publication 559 provides guidance on how these tools interact with estate and gift tax obligations.[4, 3]

Germany's 10-year reset rule on Freibeträge creates a powerful planning opportunity. Because the full tax-free allowance renews every decade, parents can gift up to EUR 400,000 to each child, wait 10 years, and gift another EUR 400,000 — all tax-free. For a couple with two children, this means up to EUR 1.6 million can be transferred tax-free every 10 years. Combining this with the family home exemption under the ErbStG and business succession relief (Betriebsvermögensbegünstigung), even substantial family estates can often be transferred with minimal or no tax.[7, 6]

In Japan, common planning strategies include utilizing the life insurance exemption (JPY 5 million per heir), the spousal tax credit, and the special valuation reduction for small residential land (小規模宅地等の特例), which can reduce the taxable value of qualifying residential land by up to 80%. The NTA also allows strategic division of estates among heirs to take advantage of lower progressive brackets. Lifetime gifts below the annual JPY 1.1 million exemption accumulate tax-free over time, and the education fund gift exemption allows up to JPY 15 million to be set aside for grandchildren's education without gift tax.[17, 9, 8]

Why Your Effective Tax Rate Is Lower Than the Marginal Rate

A common misconception is that reaching a higher tax bracket means your entire estate is taxed at that rate. In reality, progressive taxation ensures that each bracket applies only to the portion of the estate within that bracket. The effective rate — total tax divided by total taxable value — blends all the lower brackets together. For a Korean estate valued at KRW 1.5 billion after deductions, the marginal rate is 40%, but the effective rate is approximately 26.7% because the first KRW 1 billion is taxed at rates from 10% to 30%.[2, 12]

The gap between marginal and effective rates widens as exemptions are factored in. In the United States, consider an estate valued at $20 million. After the $15 million exemption (2026, OBBBA), only $5 million is taxable. While the marginal rate on that taxable amount is 40%, the effective rate on the entire $20 million estate is just 10.0% ($2.0 million in tax ÷ $20 million total). According to the Tax Foundation, this dynamic explains why the average effective estate tax rate paid by taxable estates is significantly below the 40% statutory top rate.[5, 12]

Japan illustrates the effect even more starkly due to its eight-bracket system. Consider an inheritance of JPY 200 million per heir after the basic deduction. The marginal rate reaches 40% (the fifth bracket), but the effective rate comes out to approximately 33.2% because JPY 30 million is taxed at 10%, another JPY 20 million at 15%, JPY 20 million at 20%, JPY 30 million at 30%, and only the remaining JPY 100 million at 40%. As the OECD notes, comparing countries by top marginal rates alone can be misleading without considering the full bracket structure and available deductions.[8, 10]

Understanding the difference between marginal and effective rates is essential for realistic estate planning. The marginal rate tells you the tax cost of adding one more dollar to the estate, which is useful for evaluating incremental planning decisions. The effective rate tells you the overall tax burden as a percentage of the total estate, which is what matters for cash flow planning and determining whether heirs can afford to retain inherited assets. Using a calculator that shows both rates side by side helps avoid the common trap of overestimating the tax bill based on the marginal bracket alone.[10, 12]

Frequently Asked Questions About Inheritance and Estate Tax

Key Takeaways: What Every Heir and Estate Planner Should Know

Inheritance and estate taxes vary dramatically across jurisdictions, but several principles are universal. Progressive bracket structures mean your effective tax rate is always lower than the top marginal rate — the calculator above lets you verify this for your specific situation. The United States, with its $15 million OBBBA exemption (2026), shields the vast majority of estates from federal tax, though state-level taxes can apply at much lower thresholds. South Korea and Japan cast a wider net with lower exemptions and higher top rates (50% and 55%, respectively). Germany's relationship-tiered Freibeträge provide generous protection for close family members while taxing more distant heirs heavily. Across all four countries, proactive planning through lifetime gifting, trust structures, spousal deductions, and special-use valuations can substantially reduce the tax burden. The most costly mistake is failing to plan at all: missing filing deadlines, neglecting portability elections, overlooking state-level obligations, or confusing the marginal rate with the effective rate. Whether your estate is modest or substantial, consulting a qualified tax professional or estate planning attorney — credentialed through organizations like the CFP Board or your country's equivalent — is the single most impactful step you can take to protect your family's wealth across generations.[10, 3, 13, 24]