If you own assets outside the United States, there is a strong chance your estate plan has at least one significant gap in it. For New Yorkers navigating foreign real estate and cross-border financial complexity, the mistakes that show up most often are not obscure technicalities. They are predictable, avoidable, and in many cases completely irreversible once the wrong moment has passed.
This blog is for anyone who owns property abroad, has a non-citizen spouse, holds investments in foreign accounts, or has moved internationally and has not revisited their estate plan recently. By the time you finish reading, you will understand the most consequential mistakes in international estate planning, why they happen, and what you can do to make sure your plan actually works when your family needs it to.
The cost of these mistakes is not always measured in dollars. Some of the most damaging outcomes are the ones that play out over years of foreign legal proceedings, strained family relationships, and financial uncertainty that adequate planning would have prevented entirely.
What Are the Most Costly Mistakes People Make in International Estate Planning?
1. Assuming a U.S. will covers everything
This is the single most common and most consequential error. A New York will has no automatic legal authority in France, Colombia, Japan, or anywhere else. Foreign courts and financial institutions are not obligated to recognize it, and in many cases, they will not do so without a lengthy, expensive recognition process (probate validation) that delays estate administration significantly. This foundational assumption is where many other cross-border failures begin.
2. Failing to leverage choice-of-law rules against forced heirship
Many countries legally require a portion of an estate to pass to certain heirs, such as children, regardless of what a will instructs. Much of civil-law Europe (including Germany and Italy) and most of Latin America enforce these rigid frameworks. Many clients mistakenly believe these rules are completely unavowable. However, under international frameworks like the EU Succession Regulation (Brussels IV), a U.S. citizen can explicitly elect the law of their nationality (such as New York law) within their will to govern their European property. This effectively bypasses local forced heirship rules. Failing to include this precise choice-of-law clause is a massive missed opportunity. (Note: France remains a highly complex exception due to protectionist local laws passed in recent years, requiring separate, specialized structures like foreign trusts or corporate entities).
3. Ignoring the non-citizen spouse tax trap and New York’s “estate tax cliff”
The unlimited marital deduction, which allows unlimited asset transfers between spouses free of federal and state estate tax, does not apply when the surviving spouse is a non-U.S. citizen. Without a Qualified Domestic Trust (QDOT) or other specialized planning structure, assets passing to a non-citizen surviving spouse above the applicable exemptions are taxed immediately upon the first spouse’s death.
In 2026, while the federal lifetime exemption sits at $15 million per individual, New York residents face a much lower state-level exclusion of $7,350,000. Furthermore, New York does not allow “portability” of an unused exclusion between spouses and enforces a severe estate tax cliff: if your taxable estate exceeds the state threshold by more than 5%, your entire exemption is wiped out retroactively, taxing your estate from dollar one. Your cross-border plan must utilize a QDOT engineered to shield family wealth from both federal rates and New York’s punitive cliff.
4. Overlooking U.S. corporate stock held in foreign portfolios
A non-resident alien who holds shares in U.S. publicly traded companies through a foreign brokerage account has U.S.-situated assets subject to U.S. estate tax. The fact that the account is held at a foreign institution in a foreign country does not change the legal location (situs) of the underlying U.S. equities.
A non-resident alien with a $1 million portfolio of U.S. stocks held through a Swiss bank account faces potential U.S. estate tax on approximately $940,000 above the meager $60,000 non-resident exemption, at tax rates hitting 40%. This exposure remains completely invisible to most foreign investors until it becomes an immediate crisis for their heirs.
5. Not updating plans after international moves or asset acquisitions
An estate plan that was perfectly adequate when a client lived exclusively in New York becomes potentially hazardous the moment they purchase a vacation home in Italy, open an investment account in the UK, or relocate abroad for work. Many clients go years without revisiting their estate plan after acquiring foreign assets, assuming their existing documents are sufficient. By the time the gap is discovered, it is often too late to correct it efficiently.
6. Missing or late Form 706-NA filings
The estate of a non-resident alien with U.S.-situated assets above $60,000 must file Form 706-NA within nine months of the date of death. Many families miss this deadline simply because they did not know it existed. Foreign heirs dealing with grief, language barriers, and the practical challenges of managing an estate across borders often do not discover the U.S. filing requirement until severe late-filing penalties have accrued.
7. Failing to actively claim treaty benefits
Where an estate tax treaty exists between the U.S. and the decedent’s home country, treaty benefits must be actively claimed on Form 706-NA, they are never applied automatically. An estate from a treaty country that files without invoking these specific provisions will be taxed under standard domestic rules, potentially paying hundreds of thousands more than required.
8. Neglecting lifetime compliance and reporting
U.S. citizens and residents with foreign financial accounts are subject to strict annual reporting obligations, including the FBAR (Foreign Bank Account Report) and FATCA Form 8938. Non-compliance during your lifetime allows the IRS to assert steep penalties and back taxes directly against your estate after you pass, dramatically reducing what your heirs ultimately receive.
What Happens When International Estate Planning Goes Wrong?
The consequences of failing to plan across borders range from financially painful to practically devastating:
- Immediate asset freezes: When a non-resident alien dies owning U.S.-situated assets above $60,000 without advance planning, those accounts are completely frozen until the IRS issues a transfer certificate. This process typically takes six months to over a year, creating an immediate liquidity crisis for families who relied on those accounts for daily income.
- Unexpected tax bills: As noted above, a non-resident alien with $1 million in U.S. corporate stock faces an immediate estate tax bill on the $940,000 exposed above the exemption limit. If no treaty applies and no planning was done, the family has no recourse; the IRS will claim up to $376,000 of the portfolio.
- Forced heirship claims that unwind distributions: In rigid civil-law jurisdictions, a disinherited child can assert their mandatory inheritance claim for years after a death, creating prolonged litigation and potentially forcing the return of distributed assets.
- Guardianship gaps for children abroad: For expat families, guardianship designations made in a New York will are rarely recognized automatically by local courts in countries like Singapore, France, or Colombia. Without local cross-border documentation, a foreign court will apply its own regional standards to determine who raises your minor children.
- Estate administration that takes years: Unplanned international estates routinely take three to five years to fully administer due to multi-jurisdiction probate, IRS clearances, and compliance remediation.
How Can These Mistakes Be Avoided?
The path to protecting your global legacy starts with a few foundational steps:
- Work with an expert: Avoid domestic generalists. Cross-border planning requires an attorney deeply fluent in foreign succession laws, estate tax treaties, asset situs rules, and multi-jurisdiction coordination.
- Conduct a comprehensive global asset inventory: Gather exact account locations, ownership structures, and values across all countries before drafting begins.
- Deploy a multi-will or choice-of-law strategy: Work with your lead attorney to determine whether you need a coordinated multi-will structure or specific international treaty elections to secure your foreign real estate.
- Incorporate local counsel: Ensure your primary New York attorney engages and collaborates with qualified local practitioners in each country where your assets sit.
- Maintain a strict compliance calendar: Stay up to date on annual FBAR and Form 8938 filings to ensure your estate isn’t consumed by lifetime compliance penalties after you’re gone.
Frequently Asked Questions
Does my New York will automatically protect assets I own in other countries?
No. A New York will has no automatic legal authority outside the United States. While some countries may eventually recognize it through a complex validation process, local laws or forced heirship rules will frequently override your intent unless you explicitly utilize cross-border tools like the EU Succession Regulation choice-of-law election.
What happens if I do not plan for U.S. estate tax on foreign assets?
For non-resident aliens, U.S. corporate stocks, real estate, and certain business interests are taxed aggressively above a $60,000 exemption. For New York residents with foreign assets, failing to plan around the non-citizen spouse rules can trigger immediate taxation at both the federal level and under New York’s punitive 105% estate tax cliff.
How often should I update my international estate plan?
Because international plans are exposed to shifting tax laws in multiple jurisdictions simultaneously, an annual or biennial review is highly recommended. Furthermore, any major life event, such as purchasing a foreign property, a change in citizenship, an international relocation, or a marriage, warrants an immediate comprehensive review.If you own assets outside the United States, there is a strong chance your estate plan has at least one significant gap in it. For New Yorkers navigating foreign real estate and cross-border financial complexity, the mistakes that show up most often are not obscure technicalities. They are predictable, avoidable, and in many cases completely irreversible once the wrong moment has passed.
This blog is for anyone who owns property abroad, has a non-citizen spouse, holds investments in foreign accounts, or has moved internationally and has not revisited their estate plan recently. By the time you finish reading, you will understand the most consequential mistakes in international estate planning, why they happen, and what you can do to make sure your plan actually works when your family needs it to.
The cost of these mistakes is not always measured in dollars. Some of the most damaging outcomes are the ones that play out over years of foreign legal proceedings, strained family relationships, and financial uncertainty that adequate planning would have prevented entirely.
What Are the Most Costly Mistakes People Make in International Estate Planning?
1. Assuming a U.S. will covers everything
This is the single most common and most consequential error. A New York will has no automatic legal authority in France, Colombia, Japan, or anywhere else. Foreign courts and financial institutions are not obligated to recognize it, and in many cases, they will not do so without a lengthy, expensive recognition process (probate validation) that delays estate administration significantly. This foundational assumption is where many other cross-border failures begin.
2. Failing to leverage choice-of-law rules against forced heirship
Many countries legally require a portion of an estate to pass to certain heirs, such as children, regardless of what a will instructs. Much of civil-law Europe (including Germany and Italy) and most of Latin America enforce these rigid frameworks. Many clients mistakenly believe these rules are completely unavowable. However, under international frameworks like the EU Succession Regulation (Brussels IV), a U.S. citizen can explicitly elect the law of their nationality (such as New York law) within their will to govern their European property. This effectively bypasses local forced heirship rules. Failing to include this precise choice-of-law clause is a massive missed opportunity. (Note: France remains a highly complex exception due to protectionist local laws passed in recent years, requiring separate, specialized structures like foreign trusts or corporate entities).
3. Ignoring the non-citizen spouse tax trap and New York’s “estate tax cliff”
The unlimited marital deduction, which allows unlimited asset transfers between spouses free of federal and state estate tax, does not apply when the surviving spouse is a non-U.S. citizen. Without a Qualified Domestic Trust (QDOT) or other specialized planning structure, assets passing to a non-citizen surviving spouse above the applicable exemptions are taxed immediately upon the first spouse’s death.
In 2026, while the federal lifetime exemption sits at $15 million per individual, New York residents face a much lower state-level exclusion of $7,350,000. Furthermore, New York does not allow “portability” of an unused exclusion between spouses and enforces a severe estate tax cliff: if your taxable estate exceeds the state threshold by more than 5%, your entire exemption is wiped out retroactively, taxing your estate from dollar one. Your cross-border plan must utilize a QDOT engineered to shield family wealth from both federal rates and New York’s punitive cliff.
4. Overlooking U.S. corporate stock held in foreign portfolios
A non-resident alien who holds shares in U.S. publicly traded companies through a foreign brokerage account has U.S.-situated assets subject to U.S. estate tax. The fact that the account is held at a foreign institution in a foreign country does not change the legal location (situs) of the underlying U.S. equities.
A non-resident alien with a $1 million portfolio of U.S. stocks held through a Swiss bank account faces potential U.S. estate tax on approximately $940,000 above the meager $60,000 non-resident exemption, at tax rates hitting 40%. This exposure remains completely invisible to most foreign investors until it becomes an immediate crisis for their heirs.
5. Not updating plans after international moves or asset acquisitions
An estate plan that was perfectly adequate when a client lived exclusively in New York becomes potentially hazardous the moment they purchase a vacation home in Italy, open an investment account in the UK, or relocate abroad for work. Many clients go years without revisiting their estate plan after acquiring foreign assets, assuming their existing documents are sufficient. By the time the gap is discovered, it is often too late to correct it efficiently.
6. Missing or late Form 706-NA filings
The estate of a non-resident alien with U.S.-situated assets above $60,000 must file Form 706-NA within nine months of the date of death. Many families miss this deadline simply because they did not know it existed. Foreign heirs dealing with grief, language barriers, and the practical challenges of managing an estate across borders often do not discover the U.S. filing requirement until severe late-filing penalties have accrued.
7. Failing to actively claim treaty benefits
Where an estate tax treaty exists between the U.S. and the decedent’s home country, treaty benefits must be actively claimed on Form 706-NA, they are never applied automatically. An estate from a treaty country that files without invoking these specific provisions will be taxed under standard domestic rules, potentially paying hundreds of thousands more than required.
8. Neglecting lifetime compliance and reporting
U.S. citizens and residents with foreign financial accounts are subject to strict annual reporting obligations, including the FBAR (Foreign Bank Account Report) and FATCA Form 8938. Non-compliance during your lifetime allows the IRS to assert steep penalties and back taxes directly against your estate after you pass, dramatically reducing what your heirs ultimately receive.
What Happens When International Estate Planning Goes Wrong?
The consequences of failing to plan across borders range from financially painful to practically devastating:
- Immediate asset freezes: When a non-resident alien dies owning U.S.-situated assets above $60,000 without advance planning, those accounts are completely frozen until the IRS issues a transfer certificate. This process typically takes six months to over a year, creating an immediate liquidity crisis for families who relied on those accounts for daily income.
- Unexpected tax bills: As noted above, a non-resident alien with $1 million in U.S. corporate stock faces an immediate estate tax bill on the $940,000 exposed above the exemption limit. If no treaty applies and no planning was done, the family has no recourse; the IRS will claim up to $376,000 of the portfolio.
- Forced heirship claims that unwind distributions: In rigid civil-law jurisdictions, a disinherited child can assert their mandatory inheritance claim for years after a death, creating prolonged litigation and potentially forcing the return of distributed assets.
- Guardianship gaps for children abroad: For expat families, guardianship designations made in a New York will are rarely recognized automatically by local courts in countries like Singapore, France, or Colombia. Without local cross-border documentation, a foreign court will apply its own regional standards to determine who raises your minor children.
- Estate administration that takes years: Unplanned international estates routinely take three to five years to fully administer due to multi-jurisdiction probate, IRS clearances, and compliance remediation.
How Can These Mistakes Be Avoided?
The path to protecting your global legacy starts with a few foundational steps:
- Work with an expert: Avoid domestic generalists. Cross-border planning requires an attorney deeply fluent in foreign succession laws, estate tax treaties, asset situs rules, and multi-jurisdiction coordination.
- Conduct a comprehensive global asset inventory: Gather exact account locations, ownership structures, and values across all countries before drafting begins.
- Deploy a multi-will or choice-of-law strategy: Work with your lead attorney to determine whether you need a coordinated multi-will structure or specific international treaty elections to secure your foreign real estate.
- Incorporate local counsel: Ensure your primary New York attorney engages and collaborates with qualified local practitioners in each country where your assets sit.
- Maintain a strict compliance calendar: Stay up to date on annual FBAR and Form 8938 filings to ensure your estate isn’t consumed by lifetime compliance penalties after you’re gone.
Frequently Asked Questions
Does my New York will automatically protect assets I own in other countries?
No. A New York will has no automatic legal authority outside the United States. While some countries may eventually recognize it through a complex validation process, local laws or forced heirship rules will frequently override your intent unless you explicitly utilize cross-border tools like the EU Succession Regulation choice-of-law election.
What happens if I do not plan for U.S. estate tax on foreign assets?
For non-resident aliens, U.S. corporate stocks, real estate, and certain business interests are taxed aggressively above a $60,000 exemption. For New York residents with foreign assets, failing to plan around the non-citizen spouse rules can trigger immediate taxation at both the federal level and under New York’s punitive 105% estate tax cliff.
How often should I update my international estate plan?
Because international plans are exposed to shifting tax laws in multiple jurisdictions simultaneously, an annual or biennial review is highly recommended. Furthermore, any major life event, such as purchasing a foreign property, a change in citizenship, an international relocation, or a marriage, warrants an immediate comprehensive review.
