As divorce attorneys serving clients throughout Naperville and the greater Chicago area, we frequently work with clients dealing with the impact of prenuptial agreements, both during divorce and before marriage. A prenuptial agreement, or “prenup,” can offer clarity and protection for both parties, but only if the agreement is valid and enforceable under Illinois law. Many people assume that once a prenup is signed, it cannot be changed or challenged. That’s not true. Illinois courts can and do invalidate prenuptial agreements under specific circumstances, particularly when fairness, disclosure, or consent is at issue.
Prenuptial agreements in Illinois are governed by the Illinois Uniform Premarital Agreement Act (750 ILCS 10/1 et seq.). This law outlines the legal standards for when a premarital agreement is valid and the conditions under which a court may set one aside. If you’re entering into a marriage or currently facing divorce, it’s important to know whether the prenup you signed, or were asked to sign, meets legal standards. As attorneys, our job is to ensure that these agreements protect our clients’ interests and comply with Illinois law. If they don’t, we know how to challenge them.
Under 750 ILCS 10/2, a prenuptial agreement must be in writing and signed by both parties. It becomes effective upon marriage. The agreement can cover matters such as property division, spousal support, and the rights to control or transfer assets. However, it cannot dictate child support or custody, which remain subject to the best interests of the child and judicial oversight.
For a prenuptial agreement to be valid in Illinois, several conditions must be met:
If these conditions are not satisfied, the court may declare the agreement invalid and refuse to enforce all or part of it.
Illinois courts do not automatically invalidate prenuptial agreements, but they will examine the agreement closely if one party contests it. The most common grounds for invalidating a prenup include:
When a marriage ends in divorce, the terms of a prenuptial agreement are often reviewed closely, especially when one party raises concerns about the agreement’s fairness or legality. We assist clients in challenging prenuptial agreements by:
If a court finds that any part of the agreement violates Illinois law, that provision, or the entire agreement, may be invalidated.
Yes. Timing matters. If you signed the agreement shortly before the wedding and were under pressure, a court may find that you did not sign voluntarily. Courts look at whether you had time to consult with legal counsel and consider your options. Signing under duress or without time to review may support a legal challenge.
Absolutely. Challenging a prenuptial agreement involves complex legal arguments and a detailed understanding of Illinois family law. We represent clients who want to challenge unfair agreements and know how to present evidence of coercion, nondisclosure, or unconscionability to the court.
If your spouse failed to fully disclose their financial situation and you didn’t waive the right to disclosure in writing, the court may invalidate the agreement under 750 ILCS 10/7(a). Full and fair disclosure is a key requirement for enforceability.
Yes, but only if the waiver is not unconscionable at the time of enforcement. If enforcing the waiver would leave you unable to support yourself or force you to rely on public aid, the court may override the waiver under 750 ILCS 10/7(b).
Not always. While courts give weight to contracts signed by both parties, they also consider fairness and compliance with legal standards. If the agreement violates public policy or includes unenforceable terms, like waiving child support, it may be modified or struck down in whole or in part.
Unconscionability can arise from extreme unfairness, such as one party receiving everything while the other walks away with nothing. Courts also consider whether one party had significantly more bargaining power or lacked the opportunity to consult legal counsel. The financial and personal circumstances at the time of signing and enforcement are both relevant.
Yes. You and your spouse can agree to amend or revoke your prenuptial agreement after marriage. Any changes must be in writing and signed by both parties, consistent with 750 ILCS 10/6. We help clients draft postnuptial amendments when life changes affect their original agreement.
While not required, having separate legal counsel is strongly advised. If you didn’t have your own attorney and the agreement heavily favors your spouse, a court may question whether the agreement was fair or voluntarily signed. This can be grounds for a challenge, especially if combined with lack of disclosure or coercion.
At Keller Legal Services, we understand that prenuptial agreements are often signed with the best intentions, but not all agreements meet Illinois legal standards. If you believe your prenup was unfair, signed under pressure, or failed to include proper disclosures, we are ready to review your agreement and protect your rights under Illinois law.
Contact our Naperville prenuptial agreement lawyer at Keller Legal Services by calling 630-505-1515 to receive your free consultation. We represent clients in Naperville and throughout the greater Chicago area, and we’re here to help you fight for a fair and lawful outcome.
