What to know:
- A prenup signed abroad can be enforced in the US, but a court measures it against the standards of the state where enforcement is sought, not the country where you created it.
- US courts have discretion to recognize foreign prenuptial agreements and generally do so unless the agreement is unconscionable or frustrates public policy, according to analysis from Holland & Knight.
- New York has upheld foreign prenups in cases like Stawski v. Stawski (a German agreement) and declined to enforce them in others, so outcomes vary by facts and state.
- Only 29 states plus the District of Columbia have adopted the Uniform Premarital Agreement Act, so the test a court applies depends heavily on where you end up living and divorcing.
- Where a foreign agreement is uncertain, many couples build a fresh US prenup that meets their state's rules, and First's guided process can help a couple do that on their own timeline.
You have a prenup. You signed it in another country, maybe years ago, maybe in another language, and now a move to the US has you wondering whether that document means anything here. That worry is common among mobile international couples, and the short version is reassuring: a foreign prenup can hold up in a US court. Whether it does depends less on where you signed it and more on whether it meets the standards of the state where you end up. According to analysis from the law firm Holland & Knight, US courts have discretion to recognize foreign prenuptial agreements and generally do so unless the agreement is unconscionable or frustrates public policy.
If you are earlier in this process and want the wider view, our companion piece on prenups for international couples covers the broader landscape. This post goes deeper on one narrow question: will the document you already have survive a US divorce?
Is a prenup signed in another country valid in the US?
A prenup signed abroad can be valid in the US, as long as it meets the procedural standards of the state where enforcement is sought. There is no single national rule, and no automatic answer in either direction. A foreign agreement is not automatically binding here, and it is not automatically void either. A US judge evaluates it the way they would evaluate any prenup brought before them, measured against the law of their state.
This matters because prenups are recognized in all 50 states and D.C., but the specific test a court uses varies. Only 29 states plus the District of Columbia have adopted the Uniform Premarital Agreement Act, a model law meant to bring consistency to how these agreements are reviewed. In states that have adopted it, courts apply a familiar framework. In states that have not, courts apply their own case law and statutes. The same German or South African agreement can be read differently in two different states.
One point worth separating out, because people conflate the two: recognizing a foreign prenup is a different question from recognizing a foreign divorce. A US court might honor a prenup you signed in France while handling your divorce entirely under US law, or it might be asked to recognize a divorce decree issued abroad. Those are separate legal questions with separate standards. This post is about the prenup.
How do US courts decide whether to recognize a foreign prenup?
US courts decide by applying the principle of comity, then testing the agreement against state standards. Comity is the idea that a US court can choose to respect the laws or acts of another country rather than ignore them. It is a choice, not an obligation, which is why discretion runs through this whole area. The Cornell Legal Information Institute describes comity as the recognition one nation extends to the legislative, executive, or judicial acts of another.
Under that principle, a court generally recognizes a foreign prenup unless one of two things is true: the agreement is unconscionable, meaning its terms are so one-sided they shock the conscience, or it violates the public policy of the state where the case is heard. Public policy is the state's sense of what agreements it will not let private parties make. A clause that waives something a state considers non-waivable, for example, can run into that wall even if it was perfectly legal where it was signed.
Beyond those two gates, a judge looks at the questions they would ask of any prenup. Did both partners sign voluntarily, without pressure or coercion? Did each understand what they were agreeing to? Was there financial disclosure? These are the same fairness checks that decide whether a domestic prenup holds up, and they do not disappear because the document crossed a border. Because divorce law is set state by state, a foreign prenup valid where it was signed is not assured of enforcement in every US state. Our state-by-state guide shows how much the ground can shift depending on where you land.
What have US courts done with foreign prenups?
Courts have gone both ways, which is the clearest evidence that these cases turn on facts rather than a blanket rule. New York offers useful examples because its courts have addressed foreign agreements directly.
In Stawski v. Stawski, 843 N.Y.S.2d 544 (2007), a New York court upheld a prenuptial agreement that was validly created in Germany. In Van Kipnis v. Van Kipnis, 872 N.Y.S.2d 426 (2008), New York enforced a French marital-regime agreement, the kind of property arrangement couples enter under French law. Both agreements were honored.
But the same state has declined to enforce a foreign agreement when the circumstances did not hold up. In Karg v. Kern, 129 A.D.3d 620 (2015), a New York appellate court declined to enforce a German prenup. The outcome depends on how the specific agreement was made and what it says, measured against the forum state's law, rather than on the country of origin. A foreign prenup is a strong starting point, not a settled result.
What makes a foreign prenup more likely to hold up here?
A foreign prenup is more likely to hold up when it reads like a US-compliant agreement and arrives properly documented. A few concrete things improve the odds.
A certified translation. If your agreement is in a language other than English, a US court may require a certified translation before it will consider the document. Clear, accurate language also helps show that both partners understood what they signed, which feeds directly into the voluntariness and understanding questions a judge asks.
Authentication. Foreign documents often need to be authenticated before a US court treats them as genuine. For countries that belong to the Hague Apostille Convention, this runs through an apostille, a certificate that verifies the signatures and seals on a public document so another country will recognize it. The U.S. Department of State publishes guidance on how foreign documents are authenticated for use here. Authentication helps a document get accepted into evidence, though it does not by itself decide whether the terms will be enforced.
Disclosure and voluntariness. The agreement is on firmer ground if both partners exchanged honest information about their finances and signed without pressure. These are the same fairness checks a US court applies to any prenup.
A choice-of-law clause. This is one of the most useful features a cross-border agreement can carry. Section 3(a)(7) of the Uniform Premarital Agreement Act lets parties contract for the choice of law governing the construction of their agreement, meaning the couple can state which jurisdiction's law should be used to interpret the document. A clear choice-of-law clause gives a court a roadmap instead of a guess. Whether and how it is honored still depends on the forum state, but naming the intended law removes one layer of uncertainty.
Should you redo your prenup if you move to the US?
You have three real options with a foreign prenup after a move: keep it, supplement it, or redo it. Which one fits depends on how closely your agreement already tracks US-style procedure and how different your new state's legal system is from the one where you signed.
A clean US-compliant prenup is easier for a court to work with than a patchwork of foreign paperwork stitched to a new jurisdiction. That does not mean your existing agreement is worthless. It means the cleaner the fit, the fewer openings a court has to set it aside.
| Path | When it fits | What it involves |
|---|---|---|
| Keep it as is | The agreement already tracks US-style procedure: disclosure, voluntariness, independent counsel | Authenticate and translate it, then confirm with a US attorney that it meets your state's rules |
| Supplement it | Core terms are sound, but US formalities or a choice-of-law clause are missing | Have a US attorney review the agreement and add compliant language |
| Redo it in the US | The agreement is unclear, old, or built for a legal system very different from your state's | Sign a fresh US prenup that meets your state's standards before or during the marriage |
If you are already married, redoing the agreement means a postnuptial agreement rather than a prenup. The two cover similar ground at different moments; our guide on the difference between a prenup and a postnup walks through how they compare. First is building a postnup product, and married couples can join the First Postnup early-access list, though for anything you need handled now, consult independent legal counsel about a postnuptial agreement.
One more note for couples whose move also involves immigration: if a green card is part of your picture, our post on prenups and green cards covers how those two threads interact.
Frequently asked questions
Is a prenup signed in another country valid in the United States?
It can be. US courts generally recognize a foreign prenup under the principle of comity, as long as it is not unconscionable and does not violate the public policy of the state where enforcement is sought. The signing location matters less than whether the agreement meets that state's standards.
Will a US court automatically enforce my foreign prenup?
No. US courts have discretion over foreign prenuptial agreements. A judge reviews whether the agreement was signed voluntarily, whether both partners understood it, and whether the terms shock the conscience or conflict with state public policy before deciding to enforce it. Nothing about enforcement is automatic.
Do I need to translate a prenup signed in another language?
Often, yes. If a prenup was signed in a language other than English, US courts may require a certified translation, and the document may need to be authenticated before a court will consider it. Clear language also helps show that both partners understood the terms they agreed to.
What is an apostille and do I need one for my foreign prenup?
An apostille authenticates the signatures and seals on a public document so another country recognizes it. For countries in the Hague Apostille Convention, this is a streamlined process. It can help a foreign prenup be accepted into evidence, though authentication alone does not decide whether the terms will be enforced.
Should I sign a new prenup if I move to the US?
Many couples do. If your foreign agreement does not clearly meet your new state's standards, signing a fresh US prenup, or having a US attorney review and supplement the existing one, reduces the risk a court sets it aside later. The cleaner the fit with your state's rules, the better.
Does a foreign prenup protect assets I own abroad?
A prenup can address foreign assets, but enforcing a US order against property in another country can be difficult, and valuing foreign assets can be complex. Couples with significant overseas holdings often consult counsel in each relevant jurisdiction so the agreement works across borders.
Bringing clarity to a cross-border prenup
If a prenup you signed abroad has you unsure where you stand after a move, you have options: confirm it with a US attorney, supplement it, or build a fresh agreement that meets your state's rules. First offers a guided, fully digital way to create a US prenup on your own timeline, with independent attorney review available when a situation calls for it. Start whenever you are ready.
