Illinois law allows premarital agreements to address property rights, financial arrangements, and certain personal rights and obligations that comply with public policy and applicable law. However, Illinois appellate courts have not clearly established that a financial penalty triggered by infidelity will be enforced. When marital property is spent on an affair, a dissipation claim can provide a separate remedy in qualifying cases.
At Caesar & Bender, LLP, Chicago prenuptial agreement lawyers Michael Ian Bender and Molly E. Caesar help couples prepare agreements tailored to their financial circumstances and long-term goals. They work with clients to draft prenuptial agreements that clearly address property rights, financial expectations, and other terms that could become important if the marriage ends.
This guide covers how Illinois law treats infidelity and lifestyle clauses, potential enforceability issues, and financial alternatives to consider.
Call Caesar & Bender, LLP at (312) 236-1500 to discuss your prenuptial agreement. We help clients throughout Chicago, Cook County, and the surrounding suburbs prepare agreements that address their financial priorities.
Are Infidelity Clauses Enforceable in Illinois?
The enforceability of an infidelity clause in an Illinois prenup is uncertain. Illinois is a no-fault divorce state, and courts divide marital property and determine maintenance without regard to marital misconduct. However, 750 ILCS 10/4 allows premarital agreements to address property rights tied to specified events and certain personal rights and obligations, subject to public policy and applicable law.
Illinois appellate courts have not clearly established that financial penalties triggered by infidelity are enforceable. As a result, assigning a specific payment or property adjustment to infidelity does not guarantee that a court will enforce the provision.
Can Affair-Related Spending Support a Dissipation Claim?
Yes. Under 750 ILCS 5/503(d)(2), a court can consider dissipation of marital property when dividing the marital estate. Dissipation involves using marital property for one spouse’s benefit or for a purpose unrelated to the marriage while the marriage is undergoing an irretrievable breakdown.
Spending marital funds on an affair can support a dissipation claim if those requirements are met. The claim must also comply with Illinois statutory notice and look-back requirements.
What Is a Lifestyle Clause in a Prenuptial Agreement?
A lifestyle clause is a prenup provision that sets expectations for conduct during the marriage rather than focusing solely on property or financial rights. These clauses can address personal behavior, privacy, household responsibilities, and other aspects of married life.
Common lifestyle provisions include:
- Infidelity clauses that set a payment or asset forfeiture if one spouse has an affair
- Social media and privacy clauses that restrict what spouses can share about each other or the marriage
- Weight, fitness, or appearance clauses that set expectations about health or physical appearance
- In-law and social contact clauses that address time spent with extended family or friends
- Child-related expectations involving schooling or religious upbringing, although these terms cannot override the court’s authority over a child’s best interests or adversely affect a child’s right to support
- Substance use clauses that tie financial consequences to a documented event, such as a driving under the influence (DUI) conviction
- Household responsibility clauses that address chores, holidays, or travel
Couples include lifestyle clauses for different reasons, such as setting expectations or addressing conduct that could affect the marriage. However, including a lifestyle provision in a prenup does not guarantee that a court will enforce it.
Why Can Lifestyle Clauses Be Difficult to Enforce in Illinois?
Lifestyle clauses can raise enforceability concerns under Illinois law. Under 750 ILCS 10/4, a prenup can address personal rights and obligations only if those terms comply with public policy and applicable law. Illinois courts also divide marital property and determine maintenance without regard to marital misconduct, which can create problems for provisions intended to penalize a spouse’s behavior.
Clarity is also important. Illinois courts interpret premarital agreements under contract principles, so terms based on subjective standards such as reasonable effort, appropriate weight, or excessive time with friends can lead to disputes over what the provision requires and what constitutes a violation.
750 ILCS 10/7 also sets the standards for challenging the enforceability of a premarital agreement, including requirements involving voluntariness, unconscionability, and financial disclosure.
Key Takeaway: Lifestyle clauses can raise public-policy and interpretation issues, especially when they penalize marital conduct or rely on subjective standards. Enforceability depends on the specific terms and Illinois law governing premarital agreements.
What Makes a Prenuptial Agreement Enforceable in Illinois?
Under the Illinois Uniform Premarital Agreement Act, a prenup must be in writing and signed by both parties, and no consideration is required. Its enforceability also depends on how the agreement was executed, particularly if questions arise about voluntariness, unconscionability, or financial disclosure.
A party can challenge a prenup by showing that it was not signed voluntarily. An agreement can also be challenged as unconscionable when executed if the challenging party did not receive fair and reasonable financial disclosure, did not voluntarily waive further disclosure in writing, and did not have adequate knowledge of the other party’s property or financial obligations.
The circumstances surrounding the signing can become important when determining voluntariness. Illinois does not require a prenup to be signed a specific number of days before the wedding or require either party to have independent counsel. Still, allowing enough time to consider the agreement and consult separate attorneys can help reduce later disputes over pressure or the opportunity to obtain legal advice.
Illinois law also places limits on what a prenup can accomplish. An agreement cannot adversely affect a child’s right to support. If it modifies or eliminates spousal support, a court can require support to prevent undue hardship caused by circumstances that were not reasonably foreseeable when the agreement was signed.
Prenuptial Agreement Attorneys in Chicago – Caesar & Bender, LLP
Michael Ian Bender, Esq.
Michael Ian Bender is a former Domestic Relations Judge for the Circuit Court of Cook County. He presided over thousands of family law cases before returning to private practice, where he represents clients in prenuptial agreements, high-net-worth divorce, custody and parentage disputes, maintenance, and other complex family law matters.
Michael earned his J.D. cum laude and an LL.M. with honors in Information Technology and Privacy Law from the University of Illinois Chicago School of Law. His professional recognition includes Best Lawyers in America, Leading Lawyers, Lawyers of Distinction, and multiple Litigator of the Year honors.
Molly E. Caesar, Esq.
Molly E. Caesar brings extensive litigation and negotiation experience to prenuptial agreements and other family law matters at Caesar & Bender, LLP. She has litigated cases at the trial, appellate, and Illinois Supreme Court levels and has additional training as a certified mediator.
A summa cum laude graduate of DePaul University College of Law and a member of the Order of the Coif, Molly also serves as an adjunct professor at DePaul and previously served as President of the North Suburban Bar Association. Her recognitions include Super Lawyers, Rising Stars, Emerging Lawyer, and Litigator of the Year.
What Other Lifestyle Clauses Can an Illinois Prenup Include?
Lifestyle clauses can address conduct beyond infidelity, including health, appearance, privacy, and social media. The legal concerns differ depending on what the provision requires and how it is written.
| Lifestyle Clause | What It Addresses | Main Enforceability Concern |
|---|---|---|
| Infidelity | Financial consequences tied to an affair | Public policy and uncertainty under Illinois appellate law |
| Weight, Health, or Appearance | Physical appearance, fitness, or health expectations | Subjective standards and personal-conduct concerns |
| Social Media or Privacy | Disclosure of private information, photos, or personal details | Overly broad or vague restrictions |
| In-Law or Social Contact | Time spent with relatives or friends | Difficulty defining and enforcing personal behavior |
| Substance Use | Conduct tied to alcohol or drug use | Whether the trigger and remedy comply with applicable law |
| Household Responsibilities | Chores, holidays, or travel expectations | Subjective terms and limited practical enforceability |
Weight, Health, and Appearance Clauses
Clauses involving weight, health, or appearance can be difficult to enforce because they regulate personal conduct and often rely on subjective standards. Terms such as maintaining a certain appearance or staying fit can lead to disputes over what the parties intended and what qualifies as a violation.
Illinois appellate courts have not clearly addressed the enforceability of these provisions in premarital agreements. Under 750 ILCS 10/4, any personal rights or obligations included in a prenup must remain consistent with public policy and applicable law.
Social Media and Privacy Clauses
Social media and privacy clauses can restrict the disclosure of private financial information, personal details, photographs, or other specified content. Clearly identifying what information is covered can reduce disputes over the scope of the restriction.
These provisions are still subject to applicable law and public policy. Broad restrictions such as no negative posts can create interpretation problems, while specific terms defining the prohibited disclosures provide clearer expectations for both parties.
What Happens if a Clause Is Ruled Unenforceable in Illinois?
An unenforceable clause does not automatically invalidate the rest of a prenup. A severability clause can strengthen the argument that valid provisions should remain in effect, but it is not conclusive.
Illinois contract law considers if the invalid provision can be removed without materially rewriting the agreement or changing the parties’ overall bargain. If the invalid term is essential or closely intertwined with other provisions, a court can decline to sever it even when the agreement contains severability language.
How Can a Lifestyle Clause Be Drafted More Carefully in Illinois?
Careful drafting can reduce ambiguity and disputes, but it does not guarantee that a lifestyle clause will be enforced in Illinois. Any provision addressing personal conduct should account for the public-policy and legal limits under 750 ILCS 10/4.
When drafting a lifestyle clause:
- Define the conduct or event that triggers the provision as clearly as possible.
- Avoid terms designed primarily to punish a spouse for marital misconduct.
- Keep financial terms consistent with the agreement’s property and support provisions. An objective trigger or stated payment does not automatically make an infidelity clause enforceable.
- Include a severability clause to address what happens if one provision is found unenforceable, while recognizing that a court still decides if the provision can be separated from the rest of the agreement.
- Follow Illinois requirements for written agreements, voluntary execution, and financial disclosure or waiver.
- Allow both parties enough time to consider the agreement and seek independent legal advice. Illinois law does not require separate counsel.
Key Takeaway: Clear terms and careful drafting can reduce disputes, but an infidelity or lifestyle clause must still comply with Illinois law and public policy.
Get Help from a Chicago Prenuptial Agreement Attorney
A prenuptial agreement should clearly reflect the couple’s financial goals while complying with Illinois law. This is especially important when the agreement includes infidelity or lifestyle clauses that could raise questions about enforceability.
Michael Ian Bender and Molly E. Caesar help clients prepare prenuptial agreements that address property, financial obligations, and other terms important to their circumstances. They can also evaluate proposed lifestyle provisions and explain how Illinois law could affect those terms.
Call Caesar & Bender, LLP at (312) 236-1500 to schedule a consultation. Our office at 150 N Michigan Ave #2130 in Chicago serves clients throughout Cook County and the surrounding communities.
Frequently Asked Questions
Can a prenup require my spouse to stay faithful in Illinois?
A prenup cannot practically compel a spouse to remain faithful. Illinois does not use adultery as a ground for divorce, and Illinois appellate law does not clearly establish enforcement of a financial penalty tied to infidelity. A fidelity provision therefore should not be treated as guaranteed to be enforceable.
What is a “lifestyle clause” in a prenuptial agreement?
A lifestyle clause governs behavior during the marriage rather than property division after it. Common examples include infidelity penalties, social media restrictions, weight or fitness expectations, and limits on time with extended family.
Will an Illinois judge enforce a cheating penalty clause?
Illinois appellate law does not clearly establish that a cheating penalty in a premarital agreement will be enforced. The provision can face public-policy and contract challenges, and making the trigger objective or the payment proportionate does not by itself guarantee enforceability.
Can I include a clause about weight gain or health habits?
You can include a weight, health, or appearance provision, but Illinois appellate law does not clearly establish its enforceability. Clauses based on subjective personal standards can create interpretation and public-policy disputes, so they should not be presented as reliably enforceable.
What happens if part of my Illinois prenup is unenforceable?
A severability clause can strengthen the argument that the rest of the agreement should remain enforceable, but it does not guarantee that result. A court can still consider if the invalid provision is essential to or closely intertwined with the rest of the agreement.
How much money can an infidelity clause require?
Illinois law sets no specific dollar cap for an infidelity clause, but there is also no clear Illinois appellate rule validating an infidelity-triggered payment at any particular amount. The size of the payment does not by itself resolve the public-policy and contract issues surrounding the provision.
Should I add a severability clause to my Illinois prenup?
Yes. Severability language is commonly used and can strengthen the argument that valid terms should survive if another provision is unenforceable. It is not an absolute safeguard because a court can refuse severance when the invalid term is essential to the agreement.
