2026 Illinois Divorce Law Updates: What Changed and What It Means for You

Illinois divorce law does not stand still. Each year, the Illinois General Assembly refines the rules that govern how marriages end, how children are protected, and how finances are divided. If you are considering divorce in 2026, currently navigating a case, or managing existing court orders, knowing what changed and what those changes mean practically gives you a real advantage.

Why Illinois Divorce Law Changes Every Year

The Illinois Marriage and Dissolution of Marriage Act (IMDMA) is a living statute. Lawmakers, courts, and advocacy groups continuously push for refinements that better reflect how Illinois families actually live. Some years bring sweeping overhauls; other years deliver targeted clarifications. The 2025 amendments — effective January 1, 2025,  fall somewhere in between: they are surgical changes, but they affect some of the most emotionally and financially charged issues in divorce.

Understanding these shifts matters whether you are at the beginning of your case or years into a post-divorce arrangement. Here is what you need to know for 2026.

Key Change #1: Spousal Maintenance During Incarceration

This is one of the most concrete shifts in recent memory. Under the old law, Illinois spousal maintenance (otherwise known as alimony) automatically stopped accruing when the paying spouse was incarcerated. In other words, if your ex went to prison, your maintenance payments paused and you could not collect that lost money later.

That automatic pause is gone. The 2025 IMDMA amendments removed the language that previously exempted incarcerated paying spouses. Now:

• Maintenance continues to accrue even while the paying spouse is imprisoned.
• Unpaid amounts become legally enforceable arrears, collectible after release.
• If incarceration genuinely prevents payment, the incarcerated party must actively petition the court for a modification,  it is no longer automatic.

What this means for you: If you receive maintenance and your ex is incarcerated, you now have a legal right to that accumulated debt. If you are the paying spouse and you are facing imprisonment, you need to file a modification petition immediately rather than assuming payments will pause.

This change reinforces Illinois' long-standing principle that court-ordered financial obligations are serious commitments, not ones that pause when circumstances become inconvenient.

Key Change #2: Stricter Rules for Imputing Income in Child Support Cases

Courts have always had the power to assign a hypothetical income to a parent who is voluntarily unemployed or deliberately underemployed — a process called “imputing income.” It exists to prevent a parent from artificially reducing their child support obligations by simply choosing not to work.

As of January 1, 2025, the standards for imputing income are significantly higher. Courts can still impute income, but they must now:

• Conduct a formal evidentiary hearing before imputing income  unless both parents agree to the imputed amount in writing.
• Issue specific written findings of fact explaining why income is being imputed and under what statutory factors.
• Consider local job market conditions, available employers in the parent's area, and prevailing wages in the community.

What this means for you: If you believe your co-parent is deliberately underearning to reduce their support obligation, you now have a clearer path, but also a higher evidentiary bar. You will need concrete evidence of their earning capacity, documented job availability in the area, and wage data. This makes experienced legal representation more important than ever in Illinois contested child support disputes.

Conversely, if you are the parent accused of being underemployed, you also have stronger procedural protections. The court cannot simply assign you an income figure without a hearing and written justification.

Key Change #3: Parenting Plans and Allocation Judgments — Now Final Orders

Before 2025, parenting plans and allocation judgments approved before the final divorce decree were treated as temporary orders. A 2025 amendment changed that classification. Now:

• Parenting plans approved during your divorce proceeding are immediately final and enforceable, not temporary holding measures.
• They can be appealed like any other final court judgment.
• Important caveat: if your divorce case is dismissed entirely, the allocation judgment becomes void and unenforceable.

What this means for you: Do not treat your parenting plan as a rough draft. Once a judge approves it, even mid-case, it carries real legal weight. Get the details right the first time. The standard for modifying a child custody arrangement in Illinois remains high, requiring a substantial change in circumstances, so the terms you agree to early in your case may shape your family's life for years.

What Stayed the Same in 2026

Amid the updates, it is worth knowing what did not change:

• The maintenance calculation formula — 33.3% of the payor's net income minus 25% of the recipient's net income remains in effect.
• Illinois still requires irreconcilable differences as the sole ground for divorce.
• Property division still follows equitable distribution principles under 750 ILCS 5/503.
• The income threshold for applying statutory maintenance guidelines remains at its updated level for households earning within the cap.

If you want to estimate your potential maintenance obligations, our Illinois alimony calculator and child support calculator reflect current guidelines.

How These Changes Affect Existing Divorce Orders

You might be wondering: do these changes affect orders that were entered before 2025? In some cases, yes particularly the incarceration and imputed income changes, which apply to ongoing enforcement and modification proceedings. If you have an older divorce decree and your circumstances have changed significantly, it may be worth reviewing your order with an attorney to understand your current rights and obligations.

Illinois law allows for modification of maintenance and child support when there has been a substantial change in circumstances. The 2025 amendments may create new grounds or new defenses depending on your situation.

What to Do If Your Case Is Affected

The law changes. Your circumstances change. The two do not always change at the same rate. Here is a practical checklist:

• Review your existing court orders annually, not just when a crisis arises.
• If your co-parent is incarcerated and you receive maintenance or child support, speak with an attorney about your arrears rights.
• If a child support dispute involves imputed income, prepare for a formal evidentiary hearing.
• If you are in the middle of a divorce, treat any parenting plan as a binding commitment from day one.

Talk to an Illinois Divorce Attorney About 2026 Changes

Knowing that the law changed is one thing. Understanding how it applies to your specific situation, your income, your children, your existing orders is another. The attorneys at Sterling Lawyers work exclusively in family law across Chicago and nine Illinois locations. We stay current on every IMDMA update so our clients do not have to.

Whether you are starting a divorce in Illinois, modifying an existing order, or trying to understand your rights under the new rules, we are here to help.