For cross-border couples
How does a prenup work when your lives span more than one country?
No single prenup is enforceable everywhere, because each country has its own rules. A well-built agreement names the law you want to govern it and plans for the places that touch your lives. Neptune is the lawyer-led online prenup service: both partners get their own lawyer for one flat fee.
Flat fee of $5,000 per couple. No payment to get started.
The core problem
A prenup does not automatically travel with you
Marital agreements are governed by local law. That means a prenup that is perfectly valid where you sign it can be read differently, or set aside, in another country or even another US state, if it does not meet that place's own rules on things like disclosure, timing, and independent advice.
For couples whose lives already cross borders, that gap is the whole issue. The answer is not to hope one document covers everything. It is to decide, deliberately, which law should govern your agreement and to plan for the places where you live, marry, and hold assets.
Rules differ by country and by state. Your attorney can review what applies where you live, where you plan to move, and where your assets are held, so the agreement is built with those realities in mind.
Who this is for
Three cross-border situations we hear about most
You and your partner hold different nationalities
- Each country has its own rules about marital property, and the passport you carry can shape which of those rules a court reaches for.
- A prenup is where you and your partner can name, in advance, the law you want to govern your agreement rather than leaving it to whichever court hears the case.
Your assets sit in more than one country
- A family business abroad, property held under one name overseas, or accounts in another currency each raise questions a single-country prenup was never built to answer.
- Full disclosure of what exists, and where, is what lets both attorneys work from the same picture. What is enforceable against an asset abroad may still depend on local counsel there.
You plan to move, now or later
- A prenup that is valid where you sign it may not be honored the same way after you relocate, because marital agreements are governed by local law.
- Couples who expect to move often plan for the destination as well as today, so the agreement still means something after the move. Your attorney can review what applies where you are headed.
How couples plan
The tools cross-border couples rely on
When lives cross borders, a good agreement uses a few specific tools rather than a one-size document. Your attorney can help you decide which ones fit.
A choice-of-law clause
Most jurisdictions let a couple name the law they want to govern their agreement, as long as it has a real connection to their lives. Choosing it deliberately is far better than leaving it to chance later.
Mirror agreements
For couples with strong ties to more than one country, lawyers sometimes draft separate but matching agreements in each place, so the same terms are more likely to hold up wherever life takes you.
Counsel in each place that matters
A prenup drafted for one country may need a companion agreement or local review elsewhere. You work with a US attorney from the Neptune network; assets or enforcement in another country may call for local counsel there too.
Clear disclosure and translation
Full financial disclosure on both sides, with certified translations where documents cross a language barrier, is what gives an agreement its footing. Rushed, eve-of-wedding signings are exactly what a careful process avoids.
What Neptune covers
A US agreement, built with your cross-border life in view
Each partner works with an independent, licensed US attorney from the Neptune network, chosen by them. The AI-guided intake captures foreign assets, relocation plans, and different nationalities up front, so both attorneys work from the full picture.
We are honest about scope: Neptune handles the US side. If you hold assets abroad or expect the agreement to be tested in another country, your attorney can flag where local counsel there would help.
Transparent pricing
One flat fee. Two independent attorneys.
$5,000
per couple, total
Rush pricing applies when the wedding is within 45 days. No payment required to get started.
Start your prenupRead more before you begin
Guides for cross-border couples
What changes in a prenup for international marriages
What changes when partners come from different countries or expect to live across more than one.
Read the guideCommunity property vs equitable distribution
Why the rules for dividing property differ so much from one place to the next, and what that means for your agreement.
Read the guideFinancial disclosures before a prenup
Why full disclosure matters even more when assets sit in more than one country or currency.
Read the guideGuides for you
Guides on process and timeline
Start with the guides other couples read before they begin, then take the next step when you are ready.
Common questions from cross-border couples
Is there a single prenup that works in every country?
No. There is no such thing as one worldwide-enforceable prenup, because marital agreements are governed by the law of each place. What a strong agreement does is name the law you want to govern it and plan for the jurisdictions that actually touch your lives, so you are not relying on luck if you move or hold assets abroad.
We are marrying abroad but will live in the US. What should we think about?
An agreement signed in one country can still matter in the US, but it generally has to meet the procedural rules of the state where it is later tested, such as required review periods and full disclosure. Rules differ by state, and your attorney can review what applies where you plan to live so the agreement is built to travel.
One of us has a family business or property in another country. Can a prenup address that?
Yes, a prenup can describe foreign assets and set out how you and your partner want them treated. Whether an agreement can actually reach an asset located abroad may depend on the law and courts of that country, so overseas holdings sometimes call for local counsel in addition to your US attorney.
Does a prenup affect immigration or a visa?
A prenup is a private financial agreement between you and your partner. It is a separate matter from immigration status or a visa petition. If your situation involves both, it is worth keeping your prenup attorney and any immigration counsel informed of each other so nothing works at cross purposes.
How long does the process take?
When both partners use Neptune attorneys, turnaround is typically around 3 to 4 weeks. Cross-border situations with foreign assets or translations may need extra time. If your wedding is within 45 days, rush pricing applies.