Yes, foreign prenups can be valid in the US—but only if they meet specific federal and state requirements. A foreign prenuptial agreement signed in another country may get recognized by a US court if it was signed voluntarily, both people shared full money information, and the terms are fair. However, the agreement must follow the laws where you’ll live and get divorced. Courts look at whether both people had lawyers or understood what they were signing. If the foreign prenup doesn’t meet US standards, a judge can refuse to enforce it or strike down certain parts. Around 50% of US adults support prenups, yet only about 15% of married couples have signed one, showing that couples often skip this protection until it’s too late.
What You’ll Learn:
🛡️ How foreign prenups get recognized in US courts and which requirements matter most
💰 Why federal law doesn’t control prenups—but state laws create different rules
⚖️ Real court cases showing when foreign prenups held up and when they failed
🌍 Specific mistakes people make with international prenups that cost them thousands
📋 The exact steps and forms needed to make a foreign prenup enforceable in your state
Federal Framework: The Missing Piece You Need to Know
Prenuptial agreements are not controlled by federal law. This surprises many people. Instead, state governments make all the rules about prenups. The U.S. Constitution’s Full Faith and Credit Clause requires each state to respect legal documents from other states, but this doesn’t mean your foreign prenup automatically works everywhere. The clause says states must honor court decisions from other states, but prenups are treated differently than court rulings.
Most states follow a model law called the Uniform Premarital Agreement Act (UPAA). This model law encourages states to make prenup rules similar to each other. At least 29 states plus Washington D.C. have adopted UPAA standards for how prenups work. However, even states that follow UPAA can add their own rules or change how they enforce these agreements. Think of UPAA like a recipe—states use the basic ingredients but add their own spices. This creates a patchwork of laws across America.
Federal law does step in on one issue: retirement accounts covered by a law called ERISA cannot be waived before marriage. If your foreign prenup tries to waive someone’s right to a 401(k) or pension, that part won’t work in US court. You must fill out special forms after you marry to make that happen.
Why State Law Matters More Than You Think
Since prenups are creatures of state law, the state where you live (or where you file for divorce) controls how your agreement gets enforced. This matters a lot if your foreign prenup was signed in one country and then gets tested in a different state. A prenup that was perfectly valid in France might face problems in California. Each state has its own ideas about fairness, disclosure, and what terms are acceptable.
Five states—Alaska, Florida, Kentucky, South Dakota, and Tennessee—let couples choose to follow community property rules even though they don’t require it. Nine states automatically follow community property laws: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. In these nine states, property earned during marriage gets split 50/50 unless a prenup says otherwise. A foreign prenup might not account for these rules, which could make parts of it unenforceable.
How Courts Test Foreign Prenups: The Four-Step Legal Check
When you bring a foreign prenup to an American court, the judge doesn’t just look at one thing. Instead, the court runs through multiple checks to see if the agreement should be enforced. Understanding these steps helps you understand why some foreign prenups fail and others succeed.
Step One: Procedural Fairness (Did Both People Agree Fairly?)
The first check asks: Was the agreement signed freely, without pressure or lies? This step looks at the process used when the prenup was created and signed. Did both people have time to think about it? Did they have lawyers? Could they understand what they were signing?
Courts look hard at timing. If a prenup gets presented just days before a wedding, courts get suspicious. Presenting it that close to the wedding can suggest one person was pressured and didn’t have time to get advice. California law requires at least seven days between when the final prenup is presented and when it gets signed. This waiting period gives the other person time to consult a lawyer.
Language matters too. If the foreign prenup is written in a language the other person doesn’t speak well, courts ask: Did that person have someone translate it? Was it explained in their native language? California actually requires prenuptial agreements to be translated for non-English speakers by law. If someone signed an agreement they couldn’t read or understand, courts might throw it out based on something called “undue influence” or “overreaching.”
The Stawski v. Stawski case in New York shows how courts handle language barriers with foreign prenups. In this case, an American woman married a German man and signed a German prenup in Germany. She later claimed she didn’t understand it because of the language barrier. However, the court found that a German legal official (called a notar) had explained the agreement in English before she signed it. The court also found she was educated, signed it voluntarily, and had been told she could ask questions. The New York court upheld the German prenup.
Step Two: Substantive Fairness (Are the Terms Too One-Sided?)
Even if both people agreed fairly, courts also check if the agreement itself is fair. This is called “substantive fairness.” A prenup that leaves one person with almost nothing while the other person keeps everything might get thrown out as “unconscionable”—a fancy legal word meaning shockingly unfair.
Courts use a two-part test for unconscionability. Part one asks: Is the agreement so unfair that it shocks the conscience of the court? Part two asks: Did the unfair terms come from a lack of disclosure, lack of lawyer representation, or lack of knowledge about the other person’s finances?
In Florida, courts rarely throw out prenups based on unconscionability alone. A Florida prenup must be unconscionable and have other problems like hidden assets or no voluntary waiver. In California, courts are stricter. They might refuse to enforce a spousal support waiver if it would leave one person in poverty and dependent on government help.
Step Three: Full Financial Disclosure (Did Both People Know the Money Truth?)
For a prenup to hold up, both parties must share full information about their money, debts, and property. If someone hides assets or lies about finances, the agreement can be thrown out. Different states have different rules about how much detail is needed. Massachusetts requires line-by-line lists of assets. Texas is more flexible—they only check disclosure if the prenup seems unfair. Florida falls in the middle. California says adequate knowledge of the other person’s finances is enough, though full disclosure is recommended.
When a foreign prenup comes to a US court, the judge will ask: Did each person fully know what the other person owned? With international couples, this gets complicated. One person might have property in another country, bank accounts in foreign banks, or business interests abroad. If those assets weren’t listed in the prenup, it could be treated as incomplete disclosure.
Step Four: No Illegal or Public Policy Violations (Does It Break the Rules?)
A prenup cannot include terms that break the law or go against the state’s public policy—the values the state thinks are most important. Certain topics are off-limits in every prenup, no matter what country it came from:
Child support and child custody: You cannot waive a child’s right to support or predetermine custody arrangements. Courts always keep the power to decide what’s best for children.
Illegal activities: A prenup cannot require either person to break the law. For example, a clause saying one person must commit fraud is completely void.
Lifestyle clauses: Some prenups try to control personal behavior, like requiring someone to maintain a certain weight, have sex a certain number of times per week, or do household chores. California courts refuse to enforce these lifestyle clauses. They’re about personal freedom, not money.
Terms that encourage divorce: A prenup cannot include a big payment if one person gets divorced. This looks like a reward for ending the marriage, which goes against public policy.
When courts test foreign prenups against these rules, they apply the law of the state where the prenup is being enforced, not the law where it was signed. So a French prenup that tried to waive child support would get rejected in California, even if French law allowed it.
The Three Most Common Real-World Scenarios
Scenario 1: The Overseas Marriage with a European Prenup
What Happens: Sarah (American) marries Pierre (French) in Paris before his family home. They sign a French prenup called a contrat de mariage at a French legal official’s office (a notaire). The prenup says all property each person owned before marriage stays separate, and all property earned during marriage gets split 50/50. After five years, they move to California, and Sarah files for divorce. Pierre wants to enforce the French prenup as written. Sarah argues it should be thrown out because it doesn’t follow California law.
| What Pierre Does | What Happens Next |
|---|---|
| Files the French prenup in California court | Court checks if it was signed fairly and if terms are fair |
| Shows the French prenup was signed before a notaire | California respects foreign legal procedures if they’re solid |
| Produces evidence that Sarah had time to review it | Increases chance prenup will be enforced |
| Fails to get independent translation of documents | Court might refuse to consider parts of the agreement |
| Includes full financial disclosure from both parties | Strengthens enforceability significantly |
Outcome: California courts often enforce foreign prenups if they were created properly. In this scenario, Pierre probably wins because (1) the French prenup followed French law requirements, (2) Sarah had time to review it, (3) a trained notaire explained it, and (4) both parties disclosed finances. However, California might change how certain provisions work. For example, if the French prenup had a spousal support waiver, California would only enforce it if Sarah had independent legal representation at the time she signed it. If she didn’t have a lawyer, that specific part might get thrown out while the rest of the prenup stays valid.
Scenario 2: The K-1 Visa Fiancé(e) Prenup Emergency
What Happens: David (American) meets Maria (Mexican) online and gets engaged. Maria gets a K-1 visa, which gives her 90 days to enter the US and get married. David wants a prenup badly but realizes they have almost no time. They start the prenup process when Maria arrives in the US. David hands Maria a prenup in English three days before the wedding. Maria doesn’t speak English fluently and doesn’t have a lawyer. She signs it anyway because she wants to get married on schedule.
| What David Did | Legal Problem This Creates |
|---|---|
| Presented prenup three days before wedding | Shows possible duress or lack of time for review |
| Gave prenup only in English to non-English speaker | Creates grounds for claiming Maria didn’t understand it |
| Didn’t hire independent lawyer for Maria | Makes it harder to prove the agreement was fair |
| Didn’t provide full financial disclosure | Gives Maria a strong reason to challenge validity |
| Rushed the timeline due to visa requirements | Court may find the timing unfair and void the prenup |
Outcome: This prenup faces serious trouble. Even though David and Maria eventually married, any court would question whether Maria freely agreed. Courts view rushed prenups signed before big life events with suspicion. A California court would likely require that the prenup be translated into Spanish, that Maria have independent legal advice, and that there be at least seven days between the final draft and signing—even though the K-1 visa only gave them 90 days. David should have started the prenup process before Maria got the visa, giving them more time. If this prenup gets challenged at divorce, Maria would have a strong case for throwing it out based on lack of time, language barriers, and absent legal representation.
Scenario 3: The Mahr (Islamic Marriage Deed) in New York
What Happens: Ali and Noor get married in Iraq and sign a mahr, which is a marriage agreement under Islamic law. The mahr promises that Ali will pay Noor a specific amount of money if they divorce. It’s drafted in Arabic, registered with an Iraqi court, and witnessed by religious officials. After they move to New York and Ali files for divorce, Noor tries to enforce the mahr in a New York court as if it were a prenup. Ali argues the mahr isn’t a valid American prenup because it wasn’t created under New York law.
| What Noor Does | Legal Result |
|---|---|
| Produces the mahr agreement signed in Iraq | New York court must decide if it recognizes it |
| Shows it’s a binding marriage agreement under Islamic law | Court considers whether to apply comity (international respect) |
| Provides certified translation from Arabic to English | Helps court understand the agreement’s terms |
| Proves the mahr was registered with Iraqi courts | Shows it’s a recognized legal document in Iraq |
| Cannot show independent legal counsel in America | Weakens the claim that it’s like a US prenup |
Outcome: This is complicated. New York courts have said that a mahr executed in New York but not properly acknowledged under New York law might be unenforceable. However, because Noor’s mahr was executed in Iraq under Iraqi law, New York courts apply a principle called “comity”—respecting the legal systems of other countries. The court would look at whether the mahr was fair, whether both people understood it, and whether enforcing it violates New York public policy. Because the mahr is designed to protect a wife’s financial security (a goal New York supports), courts often enforce mahrs. However, Noor would need to prove the mahr was fair at the time of signing and wasn’t obtained through fraud or duress. If Noor can do this, New York might enforce the mahr as written, though a court might adjust the amount if circumstances have changed drastically.
State-by-State Variations: Why Your Location Matters
California: The Strictest State for Foreign Prenups
California has adopted the Uniform Premarital Agreement Act but added tough requirements. If a prenup involves waiving spousal support, the person waiving support must be represented by an attorney. This is a mandatory requirement in California, not just recommended. California also requires seven days between the final draft and signing. If you have a foreign prenup without evidence of independent legal counsel, California courts will scrutinize it hard.
For foreign prenups in California, the state requires full and fair financial disclosure. However, the key word is “fair.” Courts say that if the other spouse had adequate knowledge of finances (even without a complete list), it might be enough. But to be safe with a foreign prenup, get full disclosure in writing.
Texas: The Flexible Approach
Texas allows spousal support waivers more freely than California. Texas doesn’t require legal representation, but it does require voluntariness and full disclosure. Texas courts only check financial disclosure if the prenup seems unconscionable. This means a foreign prenup has a better chance of surviving in Texas even if some paperwork is missing—as long as the terms aren’t shockingly one-sided.
Florida: The Middle Ground
Florida adopted the Uniform Premarital Agreement Act and requires written agreements signed voluntarily with full and fair disclosure. A Florida prenup is unconscionable only if it’s extremely unfair and there’s a lack of disclosure, no voluntary waiver, or no knowledge of the other person’s assets. This higher bar makes it easier to enforce foreign prenups in Florida compared to California.
New York: The Historical Center for Foreign Prenup Cases
New York has seen more foreign prenup cases than almost any other state. The courts have repeatedly upheld foreign prenups, even when they don’t perfectly match New York’s procedures. The key cases—Stawski, Van Kipnis, and De Ganay—all happened in New York, and all resulted in foreign prenups being enforced. New York courts focus on whether the agreement was fair at signing, not whether it followed every procedural step. This doesn’t mean procedure doesn’t matter; it means New York looks at the spirit of fairness, not just the letter of the law.
Critical Mistakes That Destroy Foreign Prenups
Mistake 1: Skipping Independent Legal Advice
Why It Happens: Couples marrying across borders assume they can save money by having one lawyer draft the prenup. Or they go to just a notaire (in France or Germany) without hiring separate lawyers.
The Consequence: When the prenup gets tested in a US court, the judge asks: Did each person have independent legal counsel? If the answer is no, the judge becomes suspicious that one person might have pressured the other. Even if the prenup was fair, courts might refuse to enforce certain parts if they can’t confirm both people truly understood what they were giving up. This happens especially with spousal support waivers in California.
How to Fix It: Both people should hire their own lawyers before signing. One lawyer cannot represent both spouses—that’s a conflict of interest. The lawyers don’t need to be in the same country. A US lawyer can review a prenup and advise one spouse, while a lawyer in the home country advises the other spouse.
Mistake 2: Incomplete or Hidden Financial Disclosure
Why It Happens: One person has assets spread across multiple countries—property in one nation, bank accounts in another, business interests in a third. They get lazy and don’t list everything. Or they intentionally hide some assets.
The Consequence: If a court later discovers hidden or unlisted assets, the whole prenup can be thrown out. Hiding assets is fraud, and fraud destroys prenups. Even if fraud isn’t found, incomplete disclosure gives the other person grounds to argue they didn’t truly understand what they were agreeing to.
How to Fix It: List everything. Make detailed schedules of all assets, debts, income sources, and property, whether it’s in the US or abroad. Include bank account numbers, property addresses, business ownership percentages, and retirement account values. Update these schedules regularly as circumstances change.
Mistake 3: Rushing the Timeline or Presenting It in the Wrong Language
Why It Happens: Couples want to get married on a specific date and don’t think about prenup timing. Or they sign in a country where one person’s native language is different from the prenup’s language.
The Consequence: If a prenup is presented too close to the wedding, courts assume duress (pressure to sign). If the prenup is in a language the other person doesn’t speak well, courts assume the person didn’t understand it and might throw it out. Courts are especially protective of people facing language barriers.
How to Fix It: Start the prenup process months before the wedding. Get professional translations in the native language of both spouses. In California, translation is legally required for non-English speakers. Don’t sign until you’ve had at least seven days to review the final draft.
Mistake 4: Including Terms That Violate Public Policy
Why It Happens: Couples include clauses about child support, child custody, lifestyle behaviors, or illegal activities without realizing US courts won’t enforce these terms.
The Consequence: The prenup doesn’t automatically become void, but the offending clauses get struck down. Courts call this “severability”—they remove the bad parts and keep the good parts. However, if the offensive clause is so central to the agreement that removing it changes the whole deal, courts might throw out the entire prenup.
How to Fix It: Don’t include anything about child support, child custody, or behavior control. These belong in other documents (like parenting plans or postnuptial agreements if the marriage changes) but not in prenups. Stick to property division, debt allocation, and spousal support.
Mistake 5: Failing to Account for State Law Differences
Why It Happens: A couple signs a foreign prenup without thinking about which US state they’ll live in. If they later move to a different state, the prenup might not be recognized the way they expected.
The Consequence: Different states have different rules about what’s enforceable. A spousal support waiver that’s perfectly valid in Texas might not be enforced in California. Community property state rules might override the prenup’s terms. The couple finds themselves in court fighting about a prenup they thought was settled.
How to Fix It: Include a “choice-of-law clause” in the prenup that says which state’s law will govern. For example: “This prenup will be governed by the laws of California, regardless of where we live.” If you plan to move, consider having the prenup drafted to comply with the law of the state where you’ll likely live or divorce.
How Foreign Prenups Differ from US Prenups
International Prenups Often Use Notaires Instead of Lawyers
In many European countries, legal couples work with a notaire (France, Belgium), a notar (Germany, Austria), or similar officials. These people are trained legal experts who draft and notarize important documents. They’re very different from US notary publics, who are just witnesses. However, US courts sometimes question whether a notaire’s involvement is the same as having independent legal counsel. A notaire in France might explain a prenup but might not represent just one person’s interests the way a US lawyer does. When a foreign prenup comes to a US court, the judge asks: Did each person have their own legal advisor? Was there independent legal counsel? A notaire’s involvement is better than nothing, but US courts prefer evidence that each person had their own lawyer.
International Prenups May Include Marital Regimes
In Europe and many civil law countries, couples choose a marital regime—a complete system for how property is owned and divided. For example, in France, couples can choose “separation of assets” (everything stays separate), “community of assets” (everything earned during marriage is shared), or other options. These are much broader than US prenups, which typically only cover what happens if the marriage ends. When a foreign marital regime prenup comes to the US, courts must translate these concepts into US property law. This can create confusion. US courts might not fully understand what the foreign regime was supposed to accomplish.
International Prenups May Require Apostille or Notarization
Many countries require that foreign documents be authenticated through an apostille—a special certification that proves a document is real. An apostille is like a seal of approval from one country’s government saying “Yes, this document was issued by a real authority.” If your foreign prenup needs to be enforced in the US, you should get it apostilled. This makes it harder to claim later that the document is fake. Getting an apostille requires contacting the right government office in the country where the prenup was signed. The process usually takes days to weeks and costs a small fee.
International Prenups Must Address Multiple Jurisdictions’ Property Laws
US prenups typically only need to worry about one state’s law. International prenups must think about several countries. If a couple owns real estate in three countries, which law governs that property? If they have business interests abroad, how does the prenup affect those? Good international prenups include “property schedules” that list foreign assets and say which country’s law controls them.
The Unconscionability Test: When Is a Prenup Too Unfair?
Courts use the word “unconscionable” to describe agreements that are so unfair they “shock the conscience of the court.” But what does this really mean, and how do judges decide?
Generally, unconscionability has two parts. First, the agreement must be procedurally unfair, meaning the process of creating it was wrong (like no time to review, no lawyer, pressure, or lies). Second, the agreement must be substantively unfair, meaning the terms themselves are extremely one-sided (like one person gets everything and the other gets nothing).
However, state courts vary on how strictly they apply this test. Florida courts almost never throw out prenups based on unconscionability alone. A Florida prenup must be both unconscionable and have problems like no disclosure, no waiver of disclosure, or no knowledge of the other person’s finances. This high bar means prenups are hard to challenge in Florida.
California courts are tougher. They look at whether the terms are unfair at the time of enforcement, not just at signing. If someone’s circumstances changed drastically during the marriage, California might refuse to enforce certain terms.
In 2013, a California court threw out a prenup in In re Marriage of Facter because it was shockingly unfair. At the time they signed the prenup, the husband earned millions as a successful executive and the wife was unemployed. The prenup said the wife got nothing in a divorce while the husband kept all his wealth. The court found this unconscionable because the wife would end up impoverished, making her dependent on government support.
The Full Faith and Credit Clause: Does It Really Protect Your Prenup?
The U.S. Constitution’s Full Faith and Credit Clause says that each state must respect the judicial decisions and laws of every other state. Many people think this means a prenup from one state automatically works in another state. But the reality is more complicated.
The Full Faith and Credit Clause does mean that if a court in State A made a decision about a prenup, State B must respect that decision. However, it doesn’t mean State B has to use State A’s rules when deciding whether to enforce the prenup in the first place. So if you and your spouse get divorced in State B and neither of you ever went to court in State A, State B applies its own prenup laws, not State A’s laws.
This is why the Uniform Premarital Agreement Act matters. By adopting similar prenup rules, the 29 UPAA states make it more likely that prenups will be enforced the same way across state lines. States that follow UPAA agree on basic requirements: prenups must be in writing, signed voluntarily, with full disclosure, and not unconscionable. This uniformity protects couples who move between UPAA states.
However, foreign prenups don’t get this protection. A German prenup isn’t automatically valid in California just because of the Full Faith and Credit Clause. Instead, California courts use a principle called comity—they try to respect the legal systems of other countries when it doesn’t conflict with California law. But comity is discretionary, not mandatory. A California judge could refuse to apply it.
Pros and Cons of International Prenups
| Pros | Cons |
|---|---|
| Protects separate property before marriage | Expensive to draft in multiple countries |
| Gives couples control over property division | Hard to enforce if countries don’t recognize prenups |
| Provides security if one person has debts | Language barriers can create misunderstandings |
| Reduces court battles and legal fees if divorce happens | Requires coordination with lawyers in multiple countries |
| Makes expectations clear before marriage | Some countries refuse to recognize them at all |
How to Strengthen Your Foreign Prenup for US Enforcement
Get a Choice-of-Law Clause
A choice-of-law clause says which state’s (or country’s) law will govern the prenup. For example, you might write: “This prenup will be governed by the laws of California.” This tells US courts which law to apply if a dispute arises. Without it, courts might apply the law of the state where you file for divorce, which might not be where you signed the prenup.
Include Complete Financial Schedules
Attach detailed lists of all assets, debts, property, and income for both people. Label them as “Schedule A” (Person 1’s assets) and “Schedule B” (Person 2’s assets). Be specific: list property addresses, bank account numbers, business ownership percentages, and valuations. This guards against later claims that disclosure was incomplete.
Get Independent Legal Representation Documented
Have both spouses’ lawyers sign the prenup, or at least attach letters from each lawyer confirming they advised their client. These letters should say the lawyer reviewed the prenup, explained it, and confirmed the client understood and agreed voluntarily.
Include an Apostille for Foreign Documents
If the prenup was signed in a country that’s part of the Hague Convention (most countries are), get an apostille. This certification proves the document is authentic. An apostille authenticates a document by verifying that the person or institution who issued it is known to the government of another country. You get an apostille from the government office that originally issued or notarized the document.
Translate Into Both Spouses’ Native Languages
Get professional certified translations in the native language of each spouse. Don’t rely on oral explanations. Have certified translators provide written translations and affidavits saying the translation is complete and accurate.
Address Property in Different Countries
If either person owns real estate or major assets in another country, the prenup should specifically address those properties. For example: “Real property located in France will be governed by French law” or “The couple will update this prenup if either person acquires significant foreign property.” This avoids confusion later about whether the prenup applies to overseas assets.
Include a Severability Clause
A severability clause says that if one part of the prenup is found unenforceable, the rest of the agreement still stands. For example: “If any term in this prenup is found to violate California law, that term is removed, but all other terms remain in effect.” This protects the prenup if one provision gets struck down.
The Role of Community Property States in Foreign Prenups
Nine states follow community property law: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. In these states, all property earned during marriage is automatically split 50/50 unless a prenup says otherwise. Property owned before marriage stays separate.
A foreign prenup can override community property law, but it must be clear about doing so. If your foreign prenup says “all property is separate,” that directly conflicts with community property law. A court in a community property state will have to decide whether to enforce the prenup or apply the default community property rules.
Generally, courts will enforce a prenup even in a community property state, as long as the prenup was fair and properly created. However, the prenup must be very clear about its intent. A vague foreign prenup that doesn’t specifically address community property might be interpreted differently than the couple expected.
Court Cases That Show How Foreign Prenups Get Enforced
The Stawski Case: German Prenup Upheld in New York
Lili and Axel married in Germany in 1975 and signed a German prenup under German law. The agreement created a “separation of property” regime, meaning each person kept ownership of their own property. Years later, Lili moved to New York, and the couple later divorced. Lili tried to get the prenup thrown out, arguing she didn’t understand it because she didn’t speak German well.
The New York Appeals Court found that a German legal official had explained the prenup in English before Lili signed it. The official testified that Lili seemed to understand and signed voluntarily. The court also noted that Lili was educated (she was a graduate student), was 22 years old, and had admitted she signed voluntarily. The court upheld the German prenup and said that New York law protects people’s right to make their own contracts, even if those contracts are made in foreign countries.
Lesson: Just because a prenup is signed in a foreign country doesn’t mean a US court will throw it out. Courts respect foreign legal processes and prenups created fairly.
The Van Kipnis Case: French Prenup Held Up in New York
Claire (Canadian) and Gregory (American) married in Paris in 1965 and signed a French prenup. They later moved to New York. When they divorced, Gregory wanted to enforce the French prenup. Claire argued that New York shouldn’t follow French law because she had moved to New York.
The New York Appeals Court upheld the French prenup. The court emphasized New York’s public policy supporting people’s right to make contracts, including prenups from other countries. The court looked at whether the prenup was fair and whether both people understood what they were signing. Since those factors were satisfied, New York enforced it.
Lesson: Even if a couple moves to a different state after signing a foreign prenup, that state might still enforce it if it was fair.
The Karg Case: German Prenup Rejected in New York
Not every foreign prenup gets enforced. In Karg v. Kern, a New York court rejected a German prenup. The wife claimed she didn’t understand German well and wasn’t given the prenup to review before signing. The notary involved was recommended by the husband’s parents, who also paid the notary’s fees and were present during signing. The wife said she didn’t have a chance to get independent legal advice.
The court found that the wife’s lack of German language skills, combined with no advance notice, no personal lawyer, and the notary’s conflict of interest (being recommended and paid by the husband’s family), made the prenup procedurally unfair. The court threw it out.
Lesson: Foreign prenups can be rejected if they show signs of unfairness in the process, like lack of language understanding, no time to review, no independent counsel, or conflicts of interest.
Dos and Don’ts for International Prenups
DOs:
✅ Do start the prenup process months before the wedding
✅ Do hire independent lawyers in both countries
✅ Do provide full financial disclosure in writing
✅ Do get translations in both spouses’ native languages
✅ Do include a choice-of-law clause specifying which state governs
✅ Do attach certified translation affidavits to the prenup
✅ Do get the foreign prenup apostilled if the country participates in the Hague Convention
✅ Do update the prenup if major circumstances change or you move to a different state
DON’Ts:
❌ Don’t present the prenup close to the wedding date
❌ Don’t try to include child support, custody, or lifestyle clauses
❌ Don’t hide any assets or debts
❌ Don’t rely on oral explanations instead of written translations
❌ Don’t use just one lawyer for both spouses
❌ Don’t sign a prenup you don’t fully understand in a language you don’t speak well
❌ Don’t forget to include schedules of all assets, including foreign property
❌ Don’t assume a foreign prenup will automatically work everywhere in the US
Frequently Asked Questions
Can I enforce a prenup signed in another country if I get divorced in the US?
Yes. Foreign prenups can be enforced in the US if they were signed fairly, both people disclosed finances, and the terms aren’t unconscionable. However, the court will check whether the prenup followed fair procedures and meets the standards of the state where you’re getting divorced.
What if the prenup is in a foreign language?
It must be translated. If you don’t speak English well and the prenup is in English, get a certified translation in your native language. In California, translation is legally required for non-English speakers. A certified translator should provide an affidavit confirming the translation is accurate and complete.
Do I need a lawyer in both countries?
Yes, if you want strong enforcement. Each person should hire their own lawyer in their home country or in the country where you’ll live. This proves each person had independent legal advice and understood what they were signing.
What if my country doesn’t recognize prenups?
The US will still recognize it. Some countries don’t enforce prenups under their own law, but US courts don’t care about that. US courts apply their own standards. If a prenup meets US legal requirements, a US court will enforce it, even if the country where it was signed doesn’t.
What’s an apostille, and do I need one?
Yes. An apostille is a certification that proves a document is authentic. If your foreign prenup was signed in a country that’s part of the Hague Convention (which includes most countries), get an apostille from the government office that issued or notarized the prenup. This strengthens the prenup’s enforceability.
Can my foreign prenup cover child support or custody?
No. No prenup—foreign or US—can waive a child’s right to support or predetermine custody. Courts always keep the power to decide custody based on the child’s best interests.
What if circumstances change dramatically after I sign a foreign prenup?
Courts might not enforce it. If your financial situation changes drastically—like one person loses their job or inherits a fortune—a court might decide to enforce the prenup differently. California courts especially look at whether the prenup is fair at the time of enforcement, not just at signing.
Will my prenup from one state stay valid if I move to another state?
Usually, yes. Thanks to the Full Faith and Credit Clause and the Uniform Premarital Agreement Act, most states recognize prenups from other states. However, the new state might interpret it differently. Have a lawyer review your prenup if you move to make sure it’s still enforceable.
What happens if I don’t tell my spouse about all my assets before signing?
The prenup can be thrown out. Hiding assets is fraud. If your spouse later discovers hidden property, they have strong grounds to invalidate the entire prenup. Full disclosure is not optional—it’s essential.
Can I update my foreign prenup after I move to the US?
Yes. You can update it through a postnuptial agreement (a contract made after marriage) or by signing a new prenup-like document. However, postnuptial agreements are harder to enforce than prenups because there’s no longer any “consideration” (something of value exchanged). Consult a lawyer in your new state about the best approach.
Related reading
- Can a Prenup Waive Child Support? (w/Examples) + FAQs
- Is a Prenup Valid Without a Lawyer? (w/Examples) + FAQs
- Are Prenups Valid in New York? (w/Examples) + FAQs
- Can Prenups Actually Be Challenged? (w/Examples) + FAQs
- What Does a Prenup Protect? (w/Examples) + FAQs
- Can a Prenup Actually Stop Alimony? (w/Examples) + FAQs
- What Happens if You Get Divorced Without a Prenup? (w/Examples) + FAQs