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What Is a Prenuptial Agreement and How Does It Work in Illinois?

Jan 20, 2026 | Video Transcripts

Prenuptial agreements carry a certain stigma. Many people associate them with wealthy celebrities or assume they signal a lack of trust between partners. In reality, prenups are practical legal tools that can benefit couples at virtually any income level. Understanding what a prenuptial agreement actually does, and doesn’t do, can help you make an informed decision about whether one is right for your situation.

At KHK Family Law & Divorce Attorneys in Chicago, we help couples navigate the prenuptial agreement process with both legal precision and sensitivity to the emotional dynamics involved. Attorney Matthew Katz brings over 20 years of family law experience along with a Master’s in Social Work from the University of Chicago. This combination allows him to guide clients through the legal and interpersonal aspects of creating a prenup. Our multilingual team is fluent in English and Spanish with conversational abilities in French and Persian, and we bring over 90 years of combined experience to every case.

What a Prenup Actually Does

A prenuptial agreement is a legal document that determines how property will be distributed if a marriage ends in divorce. This is an important distinction: the prenup doesn’t control property rights during the marriage itself. It only comes into play once a dissolution of marriage is filed with the court.

This means that while you’re happily married, the prenup sits quietly in a drawer. Your day-to-day financial life continues normally. The agreement only becomes relevant if and when divorce proceedings begin. At that point, the prenup provides a roadmap for how assets and debts will be divided, potentially saving both parties significant time, money, and emotional energy compared to litigating these issues in court.

The Legal Framework in Illinois

Prenuptial agreements in Illinois follow a specific set of rules under the Illinois Marriage and Dissolution of Marriage Act. Even though the agreement might address bank accounts, real estate, business interests, and investment portfolios, all the terminology used is divorce terminology. This can seem counterintuitive, but it makes sense when you remember that the document only has legal validity once divorce proceedings begin.

This is why working with an attorney who understands Illinois family law is essential. A prenup drafted without proper attention to state-specific requirements may not hold up when you need it most. The agreement must be carefully crafted to ensure it will be enforceable and will achieve the predictability you’re seeking.

What Can Be Included

Prenuptial agreements can address a wide range of financial matters. Common provisions include how specific assets will be classified as marital or non-marital property, how business interests will be treated, what happens to property acquired during the marriage, and how debts will be allocated.

Some prenups also include provisions about inheritance. For example, the agreement might specify what happens if one spouse passes away while divorce proceedings are pending. This creates an additional layer of predictability and ensures both parties understand their rights in various scenarios.

The Drafting Process

Creating a prenuptial agreement starts with a comprehensive review of each party’s financial situation. At our firm, we begin with a detailed interview that identifies all assets, debts, and financial concerns. This gives us a clear snapshot of what we’re working with and what needs to be protected.

From there, we work closely with clients to understand their specific goals. Some people want to protect a family business or anticipated inheritance. Others simply want clarity and certainty going into the marriage. Whatever your priorities, the agreement can be tailored to address your precise needs rather than relying on a one-size-fits-all approach.

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