Illinois Family Law: Divorce, Support, and Protective Orders

Illinois family law is built around the Illinois Marriage and Dissolution of Marriage Act (IMDMA), which sets the rules for divorce, property division, spousal maintenance, parental responsibilities, and child support, alongside separate statutes covering domestic violence protection and adoption. The state is no-fault for divorce, uses equitable distribution for property, applies formulas for maintenance and child support, and replaced the words “custody” and “visitation” with an allocation of decision-making authority and parenting time. What follows is a practical map of the rules that most often matter.

How Divorce Works in Illinois

Illinois recognizes only one ground for divorce: irreconcilable differences. Neither spouse has to prove fault. At least one spouse must have lived in Illinois (or been stationed here on military duty) for 90 days before the case begins.¹

The case starts with a petition for dissolution of marriage filed in the county where either spouse lives. The petition states what the filing spouse wants on property, maintenance, and any children’s issues. Filing fees vary by county and typically run several hundred dollars. When spouses agree on every term, they can use a simplified or uncontested process. When they disagree, the court will often send them to mediation before setting a trial date.

Dividing Property and Debts

Illinois follows equitable distribution. Marital property and debts are divided fairly, which is not the same as 50/50.² Marital property generally means anything acquired during the marriage. Assets a spouse owned before the marriage, received as a gift, or inherited are usually non-marital. The court weighs the length of the marriage, each spouse’s contributions (homemaking counts), each spouse’s economic situation, and any prenuptial or postnuptial agreement.

Splitting Retirement Accounts

Retirement savings earned during the marriage are marital property. For pensions and 401(k)-type plans governed by federal law, a Qualified Domestic Relations Order (QDRO) is required to actually split the account. Without a valid QDRO, the plan administrator cannot pay any portion to a former spouse, no matter what the divorce decree says.³ The QDRO must identify the participant, the alternate payee, the amount or percentage, and the specific plan.⁴ Get it drafted and approved by the plan administrator during the divorce, not after.

Spousal Maintenance

Maintenance (alimony) is not automatic. The court first decides whether an award fits the situation, looking at each spouse’s income and property, earning capacity, standard of living during the marriage, contributions to the other spouse’s career or education, and how parenting responsibilities affect a spouse’s ability to work.⁵

The Guideline Formula

When combined gross income is under $500,000 and the payor has no support obligations from a prior relationship, the amount is set by formula: 33⅓% of the payor’s net annual income minus 25% of the payee’s net annual income. A cap applies. The payee’s total net income after maintenance cannot exceed 40% of the couple’s combined net income.⁵ Above $500,000, or when the formula would produce an unjust result, the court has discretion to set a different figure.

How Long It Lasts

Duration is a multiplier of the length of the marriage. For a marriage under 5 years, the multiplier is 0.20, so a 4-year marriage might yield roughly 10 months of payments. The multiplier climbs with the years: 0.40 at 9–10 years, 0.60 at 14–15, 0.80 at 19–20. For a marriage of 20 years or longer, the court can order maintenance for a period equal to the length of the marriage or for an indefinite term.⁵

Parenting After Separation

In 2016 Illinois replaced “custody” and “visitation” with the allocation of parental responsibilities. Two things get allocated separately: decision-making authority over major life issues, and parenting time, meaning the schedule the child spends with each parent.

Decision-Making Authority

Significant decisions fall into four areas: education (including school choice), health care, religion, and extracurricular activities. The court can give all four to one parent, split them, or order joint decisions on some or all.⁶ Day-to-day calls (meals, bedtimes, routine activities) belong to whichever parent has the child at that moment.

Parenting Time

Illinois law favors schedules that give the child meaningful time with both parents when that is safe. When parents cannot agree, the court weighs 17 statutory best-interest factors. Central ones are each parent’s wishes, the child’s own preferences given age and maturity, how much day-to-day caregiving each parent did during the two years before the case was filed, and the child’s adjustment to home, school, and community.⁷ The court also looks at each parent’s willingness to support the child’s relationship with the other parent, the distance between homes, and any history of violence or abuse. In high-conflict cases, the court can appoint a Guardian ad Litem or Child Representative.

Child Support

Illinois uses the Income Shares Model. The idea is to estimate what parents would have spent on the child if the family had stayed together and split that cost between them by income. The Illinois Department of Healthcare and Family Services publishes updated tables, including a 2026 Schedule of Basic Obligations, that convert combined net income into a baseline support amount for a given number of children.⁸⁹

Each parent’s share of the basic obligation is proportional to their share of the combined net income. Parenting time matters too. When a parent has the child for a significant number of overnights, the calculation is adjusted to reflect what that parent already spends directly.

Deviations and Enforcement

Courts can deviate from the guideline when applying it would be inappropriate, considering things like the child’s own financial resources, extraordinary medical or educational expenses, and the standard of living the child would have had if the family stayed intact.⁸ Support orders are enforced through wage garnishment, driver’s license suspension, and contempt proceedings that can include jail time. Missed payments become a judgment lien that accrues interest, so ignoring an order compounds the problem.

When Another State or the Military Is Involved

If parents live in different states, federal law layers on top of Illinois rules. The Parental Kidnapping Prevention Act (PKPA) requires every state to honor custody orders from the child’s “home state,” meaning the state where the child lived with a parent for at least six consecutive months before the case was filed.¹⁰ The issuing state keeps power to modify the order as long as at least one parent or the child still lives there.

For active-duty parents, the Servicemembers Civil Relief Act (SCRA) lets a deployed service member request a stay of at least 90 days by submitting a letter explaining the conflict and a commanding officer’s statement confirming that military duties prevent attendance. A temporary custody order based only on a parent’s deployment must expire when the deployment ends, and courts cannot treat deployment (or the possibility of it) as the sole factor in a permanent custody modification.

One boundary worth knowing: if a parent takes a child out of the country, the Hague Convention on International Child Abduction can apply to children under 16, but only when both countries have signed the treaty. It decides which country’s courts have jurisdiction, not who wins custody, and defenses such as a grave risk of harm to the child can block a return.

Protective Orders in Domestic Violence Cases

The Illinois Domestic Violence Act offers three types of protective orders. Each can bar contact, order the abuser to leave a shared home, and grant temporary decision-making over children to the person seeking protection.

Emergency Orders

An emergency order of protection can be issued without notifying the other party first. The petitioner must show that giving notice would likely allow the harm the order is meant to prevent.¹¹ These orders last 14 to 21 days depending on circumstances.¹² When the courthouse is closed, a 21-day emergency order can be requested from any available judge.

Plenary Orders

A plenary order follows a full hearing where both sides can present evidence. It runs for up to two years and can be extended.¹³ Plenary orders can include remedies unavailable in emergency orders, such as required counseling, temporary child support, or compensation for losses caused by the abuse.

Penalties

Violating any order of protection is a Class A misdemeanor punishable by up to a year in jail. It becomes a Class 4 felony (one to three years in prison) if the person has a prior conviction for domestic battery, a prior violation of an order of protection, or a prior conviction for certain serious offenses against a family or household member. A second or later violation carries a mandatory minimum of 24 hours in jail.¹⁴

Adoption

The Illinois Adoption Act governs the process of becoming a legal parent to a child who is not biologically yours.¹⁵ It begins with a petition in circuit court. Within 10 days, the court appoints a licensed child welfare agency or other qualified person to conduct a home study evaluating the petitioner’s character, health, reputation, and ability to provide a stable home.¹⁶ Home study costs vary widely by agency and adoption type.

Consent

Adoption typically requires the consent of both biological parents. The mother’s consent is always needed. The father’s consent is needed when he meets criteria tied to marriage, established paternity, or demonstrated parental involvement. A court can dispense with consent if it finds by clear and convincing evidence that the parent is unfit; grounds include abandonment, desertion for more than three months, repeated cruelty, and substantial ongoing neglect.¹⁷ An adult being adopted needs only their own consent.

Federal Adoption Tax Credit

Adoptive parents may claim a federal tax credit for qualified adoption expenses such as legal fees, court costs, and travel. For adoptions finalized in 2025, the maximum credit is $17,280 per child, phasing out for families whose modified adjusted gross income exceeds $259,190.¹⁸ The credit is nonrefundable for most taxpayers, so it can reduce a tax bill to zero but generally will not produce a refund on its own. Any unused portion can be carried forward for up to five years.

Marriage and Civil Unions

Both parties to a marriage must be at least 18. Applicants who are 16 or 17 can get a license with the consent of both parents or a guardian, or with a judge’s approval.¹⁹²⁰²¹ The license must be obtained at least one day before the ceremony and is valid for 60 days. Fees vary by county.

Civil unions have been available in Illinois since June 1, 2011, under the Illinois Religious Freedom Protection and Civil Union Act, and give parties the same legal obligations, protections, and benefits that Illinois law provides to spouses.²² They remain available to all couples regardless of gender and require a license and formal ceremony. Illinois recognizes marriages and civil unions performed elsewhere as long as they were valid where they took place.

Federal Benefits After Divorce

Two federal programs create rights that many divorcing spouses miss.

Social Security for Divorced Spouses

If the marriage lasted at least 10 years, you may claim Social Security based on your ex-spouse’s earnings record. You must be at least 62, currently unmarried, and divorced for at least two years. The benefit can be up to half of your ex-spouse’s full retirement amount, and claiming it does not reduce what your ex-spouse receives. If your own benefit is larger, you get the higher amount instead.²³

COBRA Health Coverage

Divorce is a qualifying event under COBRA. If you were covered under your spouse’s employer plan at a company with 20 or more employees, you can continue that coverage for up to 36 months. You must notify the plan administrator and elect coverage within 60 days. You pay the full premium yourself, which is usually much more than what you paid as a covered dependent.²⁴

1
Illinois General Assembly. Illinois Code 750 ILCS 5/401
2
Illinois General Assembly. Illinois Code 750 ILCS 5/503 – Disposition of Property and Debts
3
U.S. Department of Labor. Qualified Domestic Relations Orders Under ERISA – A Practical Guide to Dividing Retirement Benefits
4
Office of the Law Revision Counsel. 29 U.S. Code 1056 – Form and Payment of Benefits
5
Illinois General Assembly. Illinois Code 750 ILCS 5/504 – Maintenance
6
FindLaw. Illinois Code 750 ILCS 5/602.5
7
FindLaw. Illinois Code 750 ILCS 5/602.7
8
Illinois General Assembly. Illinois Code 750 ILCS 5/505 – Child Support, Contempt, Penalties
9
Illinois Department of Healthcare and Family Services. Income Shares
10
Office of the Law Revision Counsel. 28 USC 1738A – Full Faith and Credit Given to Child Custody Determinations
11
Illinois General Assembly. Illinois Code 750 ILCS 60/217 – Emergency Order of Protection
12
Illinois Legal Aid Online. Illinois Protective and Restraining Orders Common Questions
13
Illinois General Assembly. Illinois Code 750 ILCS 60/220 – Duration and Extension of Orders
14
Illinois General Assembly. Illinois Code 720 ILCS 5/12-3.4
15
Illinois General Assembly. Illinois Code 750 ILCS 50 – Adoption Act
16
Illinois General Assembly. Illinois Code 750 ILCS 50/6 – Investigation, All Cases
17
Illinois General Assembly. Illinois Code 750 ILCS 50/8
18
Internal Revenue Service. Adoption Credit
19
Illinois General Assembly. Illinois Code 750 ILCS 5/203
20
Cook County, Illinois. Marriage Licenses
21
Circuit Court of Cook County. Marriage and Civil Union
22
Illinois General Assembly. Illinois Religious Freedom Protection and Civil Union Act
23
Social Security Administration. 20 CFR 404.331
24
U.S. Department of Labor. Separation and Divorce