Prenuptial & Postnuptial Agreement Lawyers in Chicago
If you have built something worth protecting — a business, an investment portfolio, or a family inheritance — deciding how to shield it without signaling distrust to the person you love is one of the more delicate things a marriage asks of you. A well-drafted agreement is how you do both. A prenuptial agreement (a “prenup”) is a written contract signed before marriage that sets how a couple’s property, finances, and spousal support will be handled if the marriage ends; a postnuptial agreement does the same, signed after the couple is already married. In Illinois, prenups are governed by the Illinois Uniform Premarital Agreement Act (750 ILCS 10/), and postnups by general contract law, held to an even higher standard of fairness. Done correctly, either can protect what matters. Done poorly, either can be set aside at the exact moment you are counting on it.
As experienced Chicago prenuptial agreement attorneys, the Women’s Divorce & Family Law Group by Haid and Teich LLP drafts and reviews prenuptial agreements (prenups) and postnuptial agreements for women across Chicagoland — quietly, and with attention to the details that determine whether an agreement holds. Managing partner Joshua P. Haid practiced business litigation before family law, which is exactly the background these agreements demand when a business, executive compensation, or complex assets are involved. This page is part of the firm’s high net worth divorce practice.
Protect what you have built, with an agreement that holds. Free, confidential consultation — call 312-445-8830.
What is the difference between a prenuptial and a postnuptial agreement?
The only structural difference is timing. A prenuptial agreement is signed before the wedding and takes effect when you marry; a postnuptial agreement is signed after you are already married. What they can cover is largely the same — property rights, division on divorce, and spousal support. But Illinois holds the two to different legal standards, and postnuptial agreements face closer scrutiny.
Are prenuptial agreements enforceable in Illinois?
Yes, when they are done correctly. Under 750 ILCS 10/7, a prenup is enforceable unless the spouse challenging it proves it was not signed voluntarily, or that it was unconscionable when signed and they were not given fair financial disclosure. Courts judge fairness as of the signing date, not the divorce, and the burden falls on the spouse trying to void it.
What can a prenup or postnup cover — and what can’t it?
An agreement can define separate and marital property, protect a business or inheritance, allocate debt, and set or waive spousal maintenance. What it cannot do is predetermine child support or parenting decisions — under Illinois law those are always decided at the time of divorce, based on the child’s best interests, and no agreement can sign them away in advance.
What makes a prenuptial agreement unenforceable?
Two things, under 750 ILCS 10/7. First, if a spouse did not sign voluntarily — for example, an agreement pushed on them days before the wedding. Second, if the agreement was unconscionable when signed and that spouse was not given fair and reasonable disclosure of the other’s finances and could not reasonably have known them. Full disclosure and independent counsel are the strongest protections against a challenge.
Can I protect my business with a prenup or postnup?
Yes — this is one of the most common and valuable uses. A well-drafted agreement can classify a business, and the growth in its value during the marriage, as separate property, so it is not divided or fought over in a divorce. For a business owner, this is often the single most effective step to protect the company you built. See our divorce for business owners page.
Is a postnuptial agreement harder to enforce than a prenup?
Yes. Once you are married, spouses owe each other a fiduciary duty, so Illinois courts scrutinize a postnuptial agreement more closely — looking harder at whether disclosure was complete, whether both parties signed freely, and whether the terms are fair. A postnup can absolutely be enforceable, but it must be drafted with that heightened standard in mind.
How we make sure your agreement actually holds
An agreement is only worth what it can withstand when it is challenged — and the time it gets challenged is years later, at the worst possible moment, when the stakes are highest. That is the whole job here: drafting a prenuptial or postnuptial agreement that a court will enforce, not one that looks fine until it is tested. We make sure the financial disclosure is complete and documented, that both parties have real time and independent counsel rather than a signature demanded days before the wedding, and that the terms are fair enough to survive the unconscionability standard. For a business owner or a spouse with significant separate property, this is how you protect what you built without leaving its fate to chance. Done right, the agreement is not a sign of distrust — it is the clarity that lets both people move forward with confidence.
Related: High Net Worth Divorce · Divorce for Business Owners · Complex Asset Division · Pre-Divorce Planning
An agreement is only as strong as the way it is drafted. Let us make sure yours holds — free, confidential consultation.
