What Happens to a Prenuptial Agreement If You Move to Illinois?

 Posted on April 27, 2026 in Family Law

Moving to a new state can raise real questions about legal agreements you signed somewhere else. According to the U.S. Census Bureau migration data, about 2.1 percent of Americans moved to a different state in 2024, or roughly 7.1 million people. Many of them arrived with agreements written under very different rules. Not every state has the same rules for whether a prenup is valid, and what worked in one state may not hold up in another. 

If you have a prenuptial agreement from another state and your marriage is now heading toward divorce in Illinois, that document may still be valid, but it depends on how it was written and what Illinois law says about it. If you need to review your prenup in 2026, do not wait until a divorce is filed. A Lombard family law attorney who handles prenuptial and postnuptial agreements can help you understand your options. 

Does Illinois Recognize a Prenuptial Agreement You Signed in Another State?

Illinois courts do recognize prenuptial agreements that were signed in other states. Moving here does not cancel a valid prenup. However, if you divorce in Illinois, an Illinois court will decide whether your agreement is valid. An Illinois judge will first look at the agreement and any choice-of-law clause. If the prenup does not clearly choose another state’s law, Illinois law may play a bigger role.

What Does Illinois Law Require for a Prenuptial Agreement to Be Valid?

Under the Illinois Uniform Premarital Agreement Act, 750 ILCS 10, a court can throw out a prenuptial agreement for two reasons. First, the person fighting it can show they were pressured into signing. Second, they can show that the agreement was very unfair and that they were kept in the dark about the other person's finances. The agreement must also be in writing and signed by both parties.

If your out-of-state prenup meets those basic requirements and was signed freely, it has a good chance of holding up here.

What Is a "Choice of Law" Clause and Why Does It Matter to Your Prenup?

One of the most important things to look for in your prenuptial agreement is a "choice of law" clause. This is a line in the contract that says which state's laws will apply to the agreement. Under 750 ILCS 10/4(a)(7), Illinois allows couples to pick which state's laws govern their prenup. If your agreement names another state, an Illinois court will usually follow that choice as long as it does not break Illinois law.

Without that clause, a judge picks which state's law applies on their own. They will look at where you got married, where you lived when you signed, and where your property is located. The outcome can be hard to predict. For example, some states have stricter rules about financial disclosure than others. If your prenup was signed in a state with looser requirements, an Illinois judge could decide it does not meet the standard here. This is the kind of problem that shows up years after a move, which is why reviewing your prenup after relocating is a smart step.

Can You Update an Out-of-State Prenup After Moving to Illinois?

Under 750 ILCS 10/6, a prenuptial agreement can be changed or canceled after marriage. Both spouses must agree and sign a new written document. If your prenup has no choice-of-law clause or was written under rules that differ from Illinois law, updating it may be an option if both spouses agree. Some couples add a clause naming Illinois law. 

Others use the review to update terms that no longer fit their lives. If you have had children, bought a home, or started a business since you signed, those are all worth addressing in an updated agreement. A revised prenup can cover property rights, spousal support, and debt. However, a prenup cannot take away a child’s right to support. Making changes before a divorce is filed is much easier than fighting over them in court.

Contact a DuPage County, IL Prenuptial Agreement Attorney for a Free Consultation

If you moved to Illinois with a prenup from another state, having it reviewed now can save you a lot of trouble later. That is where the experienced Lombard family law lawyers at Mevorah & Giglio Law Offices come in. Our firm brings over 175 years of combined experience to every case and is committed to client-focused service and frequent communication so you always know where you stand. We offer free consultations. Call 630-932-9100 today.