Illinois Legal Guide

Overview: Legal Issues in Illinois

Illinois's 2016 Marriage and Dissolution of Marriage Act brought sweeping modernization to the state's family law. The elimination of fault grounds, adoption of a maintenance formula, and new "parental responsibilities" framework make Illinois one of the most forward-looking family law jurisdictions.

Whether you are filing a case, handling a dispute, or evaluating your options for legal help, understanding Illinois's specific laws is the essential first step. This guide covers common legal requirements and rules that may apply in Illinois.

Filing Requirements

At least one spouse must have been an Illinois resident for at least 90 days before filing.

Filing before the required threshold is met can result in dismissal. If you have recently moved to Illinois or are considering where to file, confirming eligibility is the critical first step. An experienced Illinois attorney can confirm whether you currently qualify to file.

Case Grounds and Filing Options in Illinois

Illinois eliminated all fault-based divorce grounds in 2016. The state is now a pure no-fault jurisdiction. The only ground is irreconcilable differences, established by either mutual agreement or 6 months of separation.

For many matters, simplified or uncontested filing is the most practical choice because it avoids the time and cost of a contested hearing. In places where fault can affect outcomes, discussing strategy with your attorney before filing is worthwhile.

Property and Asset Issues in Illinois

Illinois divides marital property equitably using a multi-factor analysis that considers each spouse's economic circumstances, contributions to the marital estate (including homemaker contributions), and the duration of the marriage. Only marital property is subject to division; non-marital property remains separate.

Marital property generally includes assets and debts acquired during the marriage, while separate property (owned before marriage, or received as a gift or inheritance) is typically excluded. Complex assets like retirement accounts, business interests, and real estate often require professional valuation and careful legal handling.

Waiting Periods & Timeline

Illinois has no mandatory waiting period. However, no-fault divorce using "irreconcilable differences" requires either mutual agreement or a 6-month period of living separate and apart.

Even in states without a mandatory waiting period, the practical timeline for legal matters can range from a few weeks for simple filings to many months for contested matters. Disputed assets, business interests, or other complex issues can extend timelines significantly.

Child-Related Issues in Illinois

Following 2016 reforms, Illinois replaced the terms "custody" and "visitation" with "parental responsibilities" and "parenting time." Courts allocate significant and routine decision-making responsibilities and parenting time based on the best interests of the child.

Orders involving children are not permanent — they can often be modified after the initial order if there is a substantial change in circumstances. Courts in Illinois will always prioritize the best interests of the child over the preferences of either parent.

Common Custody Terms

• Legal custody — the right to make major decisions about the child's education, healthcare, and religious upbringing
• Physical custody — where the child primarily lives
• Joint custody — both parents share legal and/or physical custody
• Sole custody — one parent has primary legal and/or physical custody

Support Considerations in Illinois

Illinois calls spousal support "maintenance." The state uses a statutory formula: maintenance = (33.3% of payor's net income) minus (25% of payee's net income). Duration is based on the length of the marriage. Courts may deviate from the formula in complex cases.

Support is not automatic in every case. If you believe support may be available or may be required, consulting with a Illinois attorney early in the process is important.

What Makes Illinois Law Distinctive

Illinois completely overhauled its family law system in 2016, eliminating fault divorce entirely and replacing traditional custody language with a modern "parental responsibilities" framework focused on children's outcomes.

Frequently Asked Questions: Legal Issues in Illinois