Illinois Statutes Chapter 750. Families § 5/401. Dissolution of marriage

(a) The court shall enter a judgment of dissolution of marriage when at the time the action was commenced one of the spouses was a resident of this State or was stationed in this State while a member of the armed services, and the residence or military presence had been maintained for 90 days next preceding the commencement of the action or the making of the finding:

Irreconcilable differences have caused the irretrievable breakdown of the marriage and the court determines that efforts at reconciliation have failed or that future attempts at reconciliation would be impracticable and not in the best interests of the family.

(a-5) If the parties live separate and apart for a continuous period of not less than 6 months immediately preceding the entry of the judgment dissolving the marriage, there is an irrebuttable presumption that the requirement of irreconcilable differences has been met.

(b) Judgment shall not be entered unless, to the extent it has jurisdiction to do so, the court has considered, approved, reserved or made provision for the allocation of parental responsibilities, the support of any child of the marriage entitled to support, the maintenance of either spouse and the disposition of property. The court shall enter a judgment for dissolution that reserves any of these issues either upon (i) agreement of the parties, or (ii) motion of either party and a finding by the court that appropriate circumstances exist.

The death of a party subsequent to entry of a judgment for dissolution but before judgment on reserved issues shall not abate the proceedings.

If any provision of this Section or its application shall be adjudged unconstitutional or invalid for any reason by any court of competent jurisdiction, that judgment shall not impair, affect or invalidate any other provision or application of this Section, which shall remain in full force and effect.