IL
2026 Statutory Database: Illinois
Illinois
Support Jurisprudence
Comprehensive forensic directory of Illinois spousal maintenance statutes, child support guidelines, and mathematical formula frameworks.
Illinois Maintenance
Primary Statute: 750 ILCS 5/504
Eligibility & Factors
- Rigid mathematical formula for combined gross under $500k.
- Duration is indexed to a statutory percentage of the marriage length.
- Maintenance is 'fixed' once calculated, with narrow deviation grounds.
Calculation Logic
33.3% of payer net minus 25% of recipient net (Cap at 40% combined).
Forensic Modeling Level: Advanced
Illinois Child Support
Primary Statute: 750 ILCS 5/505
Guideline Metadata
- Income Shares Model (effective 2017).
- Based on 'Basic Support Obligation' tables.
- Adjusts for 'Shared Physical Care' (146+ overnights).
Formula Framework
Combined income results in a table-based obligation, shared proportional to each parent's NDI.
Compliance: 2026 Guidelines
Forensic Summary
JurisdictionIllinois (IL)
Formula Typeformula statutory
Fault ConsideredNO
Special Provisions
- Illinois uses a specific 'Duration Table' for precision modeling.
- Cohabitation on a 'resident, continuing conjugal basis' is a termination event.
- Business income normalization is strictly controlled by § 505.
Legal Disclaimer
This directory provides automated financial modeling summaries based on current 2026 statutes. It is not a substitute for advice from a licensed attorney in Illinois. Support awards are final only when signed by a presiding judge.