PROPERTY DISTRIBUTION:
Illinois is an equitable distribution state, meaning that marital property shall be divided equitably, not necessarily equally.
For purposes of distribution of property, all property acquired by either spouse after the marriage and before a judgment of dissolution of marriage is presumed to be marital property, regardless of whether title is held individually or by the spouses in some form of co-ownership such as joint tenancy, tenancy in common, tenancy by the entirety, or community property. Marital property shall be divided, without regard to marital misconduct, considering all relevant factors, including:
Non-marital property is considered:
Property acquired by gift, legacy or descent.
Property acquired in exchange for property acquired before the marriage or in exchange for property acquired by gift, legacy or descent.
Property acquired by a spouse after a judgment of legal separation.
Property excluded by valid agreement of the parties.
Any judgment or property obtained by judgment awarded to a spouse from the other spouse.
Property acquired before the marriage.
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http://divorcesupport.about.com/od/usstatedivorcelaws/a/illinois_laws.htm