Overview
Illinois is an equitable distribution state, meaning that courts divide marital property in a manner that is fair and just — not automatically 50/50. The Illinois Marriage and Dissolution of Marriage Act governs property division, and courts consider a lengthy list of statutory factors including each party’s contributions, the duration of the marriage, the value of premarital property, and tax consequences. Illinois adopted the Illinois Uniform Premarital Agreement Act to provide a clear framework for prenups.
What Counts as Marital Property?
Marital property in Illinois includes all property acquired by either spouse during the marriage, regardless of how title is held, except property acquired by gift, legacy, or descent. This includes wages, real estate purchased during the marriage, retirement benefits earned during the marriage, and the appreciation of marital property. Contributions of marital funds or effort to separate property can create a marital interest in that property.
What Stays Separate?
Nonmarital property in Illinois includes property owned before the marriage, gifts and inheritances received individually at any time, property excluded by valid agreement, and property acquired in exchange for nonmarital property. Appreciation on nonmarital property attributable solely to market forces (not marital effort) also remains nonmarital. Illinois requires clear documentation to maintain the separate character of nonmarital assets.
Prenuptial Agreements in Illinois
Illinois enacted the Illinois Uniform Premarital Agreement Act (750 ILCS 10/) effective January 1, 1990. A prenup must be in writing and signed by both parties before the marriage. It is not enforceable if a party proves involuntary execution, unconscionability at the time of execution combined with inadequate disclosure, or lack of fair financial disclosure. Illinois courts examine whether both parties had reasonable time to review the agreement before signing.
Key Considerations
- Illinois does not require a specific waiting period before signing a prenup, but courts look unfavorably on agreements signed under time pressure.
- Active appreciation — increases in value attributable to a spouse’s effort during marriage — can convert nonmarital property into marital property.
- Illinois courts can consider the contribution of a spouse as homemaker in equitable distribution, which can increase the share awarded to a non-earning spouse.
- Illinois recognizes common-law marriage only if it was validly formed in another state; Illinois itself does not recognize common-law marriages formed within the state.
Key Statutes
- Illinois Compiled Statutes 750 ILCS 5/503 (equitable distribution of marital property)
- Illinois Compiled Statutes 750 ILCS 10/1–10/11 (Illinois Uniform Premarital Agreement Act)
This is educational content, not legal advice. Consult a licensed Illinois family law attorney for guidance specific to your situation.