10 Things You Should Never Do During a Divorce in Illinois (2026 Guide)

Illinois courts divide property equitably under 750 ILCS 5/503, award maintenance using a statutory formula under 750 ILCS 5/504, and allocate parenting time based on 17 best-interest factors under 750 ILCS 5/602.7. Filing fees range from $210 to $388 depending on the county, and the process can take anywhere from 2 months for an uncontested case to 18 months or longer when disputes arise. Knowing what not to do during divorce in Illinois is often more important than knowing what to do, because a single mistake can cost tens of thousands of dollars in lost assets, unfavorable maintenance terms, or restricted parenting time.

Key Facts: Illinois Divorce at a Glance

1. Never Hide Assets or Income From the Court

Hiding assets during an Illinois divorce is one of the most damaging mistakes a spouse can make, exposing the offending party to sanctions, contempt charges, and an unfavorable property division under 750 ILCS 5/503(d). Illinois courts require full financial disclosure, and judges have broad discretion to penalize dishonesty by awarding a greater share of the marital estate to the non-offending spouse. In contested divorces involving complex finances, forensic accountants can uncover hidden accounts, undervalued businesses, and transferred assets with a high degree of accuracy.

Illinois law treats property division as a comprehensive accounting exercise. The court evaluates 12 statutory factors when dividing the marital estate, including each spouse's contribution to acquisition and the economic circumstances of both parties at the time of distribution. A spouse who hides a $50,000 retirement account or understates business income by $100,000 per year risks losing credibility on every issue in the case, from maintenance to parenting time.

Common asset-hiding tactics that Illinois courts routinely catch include transferring funds to family members, overpaying the IRS to receive a refund after the divorce, creating phantom debts, and underreporting cash income. Discovery tools such as interrogatories, subpoenas to financial institutions, and depositions give the opposing attorney access to bank records, tax returns, and business ledgers going back several years.

2. Do Not Dissipate Marital Assets

Dissipation of marital assets is a specific legal claim under 750 ILCS 5/503(d)(2) that allows a court to charge one spouse for wasteful spending that occurred while the marriage was breaking down. Illinois law defines dissipation as the use of marital property for one spouse's sole benefit, for a purpose unrelated to the marriage, during a period of irretrievable breakdown. The non-dissipating spouse may receive a credit against the marital estate equal to the amount dissipated.

A party alleging dissipation must file a notice no later than 60 days before trial or 30 days after discovery closes, whichever is later. The notice must specify the date when the marriage began breaking down, identify the property dissipated, and state the dollar amount. Illinois imposes a 3-year discovery rule: no claim can be brought for spending that occurred more than 3 years after the claiming party knew or should have known about it. An absolute 5-year outer limit bars claims for spending that occurred more than 5 years before the petition was filed.

Examples of dissipation that Illinois courts have recognized include spending $30,000 on an extramarital affair, gambling away $75,000 of retirement savings, and making $20,000 in gifts to a new romantic partner. Once dissipation is alleged, the burden shifts to the accused spouse to prove the spending served a legitimate marital purpose. This is among the biggest divorce mistakes because the financial consequences are immediate and quantifiable.

3. Stop Posting on Social Media Immediately

Social media posts are admissible evidence in Illinois divorce proceedings and can undermine claims related to income, parenting fitness, and asset valuation. A single Instagram photo showing a lavish vacation can contradict sworn statements about financial hardship, while a Facebook post criticizing the other parent can influence a judge's parenting time allocation under 750 ILCS 5/602.7. Illinois family courts routinely consider digital evidence when evaluating the 17 best-interest factors for parenting time.

The safest approach is to stop posting entirely during the divorce process. Do not delete existing posts, as destroying potential evidence can result in sanctions or an adverse inference instruction from the court. Simply set all accounts to private and refrain from publishing new content until the case is resolved. Text messages, direct messages, and even deleted posts can be recovered through discovery, so assume that anything written digitally will eventually be seen by the judge.

Common social media divorce errors include posting photos of expensive purchases while claiming inability to pay maintenance, sharing negative comments about the other spouse that a guardian ad litem includes in a report, and checking in at locations that contradict parenting time schedules. Each of these missteps creates a documented record that opposing counsel can use at trial.

4. Never Violate the Automatic Restraining Order

Illinois imposes automatic temporary restraining provisions under 750 ILCS 5/501.1 the moment a divorce petition is filed and served. These provisions prohibit both spouses from transferring, encumbering, concealing, or disposing of marital property except for ordinary living expenses or with court permission. Violating these provisions can result in contempt of court, monetary sanctions, and an unfavorable property division.

The automatic restraining order also restricts changes to insurance policies, beneficiary designations, and existing financial accounts. A spouse who cancels the other's health insurance, removes them from a joint bank account, or changes a life insurance beneficiary without court approval is committing a violation that judges take very seriously. In cases involving children, the court may view such conduct as evidence of bad faith when allocating parenting responsibilities.

Understanding what not to do during divorce in Illinois starts with reading and following the automatic restraining provisions. These restrictions remain in effect throughout the entire divorce proceeding unless modified by court order or mutual written agreement filed with the court.

5. Do Not Use Children as Leverage or Messengers

Using children as bargaining chips or intermediaries during an Illinois divorce can result in restricted parenting time under 750 ILCS 5/603.10 and a negative evaluation from a guardian ad litem. Illinois courts consider the willingness of each parent to facilitate a close and continuing relationship with the other parent as one of the 17 best-interest factors under 750 ILCS 5/602.7(b)(11). A parent who alienates the child, uses them to relay hostile messages, or interrogates them about the other household risks losing significant parenting time.

Illinois judges have the authority to restrict a parent's time with the child if evidence shows that the parent engaged in conduct that seriously endangered the child's mental, moral, or emotional health. Parental alienation, while not codified as a standalone ground, is frequently cited in Illinois case law as a factor supporting modified parenting schedules. Courts may also order family counseling at the offending parent's expense, adding $5,000 to $15,000 in therapy costs to the overall divorce expense.

The 2025 amendments to the IMDMA made parenting plans entered before the final decree immediately effective and enforceable as final orders. A parent who violates an interim parenting plan by withholding the child now faces the same enforcement mechanisms as a parent who violates a final judgment, including makeup parenting time and potential contempt proceedings.

6. Never Make Major Financial Decisions Unilaterally

Making large purchases, taking on new debt, or liquidating investments during an Illinois divorce without court approval or the other spouse's written consent violates the automatic restraining provisions of 750 ILCS 5/501.1 and can be treated as dissipation under 750 ILCS 5/503(d)(2). A spouse who buys a $40,000 vehicle, withdraws $100,000 from a brokerage account, or takes out a $50,000 home equity loan during the pending divorce risks having those amounts charged against their share of the marital estate.

The court evaluates the economic circumstances of each spouse at the time of property distribution, and reckless financial decisions made during the divorce weigh heavily in that analysis. Even seemingly reasonable expenditures, such as prepaying a child's college tuition or making accelerated mortgage payments, can be questioned if they were not disclosed to the other party or approved by the court.

Before making any financial decision exceeding routine household expenses, consult your attorney and consider whether the expenditure could be characterized as dissipation or a violation of the automatic restraining order. Document every dollar spent during the divorce with receipts and written explanations linking each expense to a legitimate marital or household purpose.

7. Do Not Ignore the Maintenance Formula

Illinois calculates maintenance (alimony) using a statutory formula under 750 ILCS 5/504 for couples with combined gross income under $500,000. The formula sets maintenance at 33.33% of the payer's net income minus 25% of the recipient's net income, capped so that the recipient receives no more than 40% of the combined net income. Duration is determined by multiplying the length of the marriage by a statutory multiplier that ranges from 0.20 for marriages of 5 years or less to indefinite maintenance for marriages exceeding 20 years.

One of the most common divorce mistakes is failing to account for how voluntary unemployment, underemployment, or unreported income affects the maintenance calculation. Under the 2025 amendments, Illinois courts must now conduct a formal evidentiary hearing before imputing income to either spouse, considering actual local job market conditions and prevailing wages. A spouse who quits a $120,000 job to work part-time at $30,000 in an attempt to reduce maintenance obligations will face scrutiny from both the court and opposing counsel.

8. Never Refuse to Cooperate With Discovery

Discovery is a mandatory phase of Illinois divorce litigation that requires both parties to disclose financial records, property valuations, income documentation, and other relevant information. Refusing to respond to interrogatories, ignoring subpoenas, or providing incomplete financial disclosures can result in court sanctions, adverse inferences, and attorney fee awards under Illinois Supreme Court Rules 213 through 219.

Illinois courts have the power to strike pleadings, enter default judgments, or bar evidence from a party who willfully fails to comply with discovery obligations. In a divorce involving $500,000 in marital assets, discovery noncompliance can shift the balance of the entire case because the court may accept the other spouse's valuation of disputed property when the non-cooperating party refuses to provide documentation.

The discovery process typically includes requests for production of documents (3 years of tax returns, bank statements, pay stubs), interrogatories (written questions requiring sworn answers), and depositions (oral testimony under oath). Respond to every discovery request completely and within the timeframe set by the court, typically 28 days under Illinois Supreme Court Rule 213.

9. Do Not Relocate With Children Without Court Approval

Illinois has strict relocation provisions under 750 ILCS 5/609.2 that require court approval before a parent can move with a child beyond specified distance thresholds. For parents living in Cook, DuPage, Kane, Lake, McHenry, or Will counties, a move of more than 25 miles from the current residence triggers the relocation statute. For parents living in all other Illinois counties, the threshold is 50 miles. Any move outside the state of Illinois requires court approval regardless of distance.

Under the 2025 amendments, courts must now use online mapping services to calculate relocation distances, and when multiple routes exist, the shortest route determines whether the threshold has been met. A parent who relocates without following the statutory notice and approval process faces serious consequences, including reversal of the move, modification of the parenting plan in favor of the non-relocating parent, and payment of the other parent's attorney fees.

The relocating parent must provide written notice to the other parent at least 60 days before the intended move date. The notice must include the intended new residence address, date of the intended move, length of the move if not permanent, and the reason for the relocation. If the non-relocating parent objects within 30 days, the court decides based on 11 statutory factors, including the impact on the child's quality of life and each parent's motives.

10. Never Represent Yourself in a Complex Divorce

While Illinois allows pro se representation in divorce proceedings, self-representation in cases involving significant assets, maintenance disputes, business valuations, or contested parenting issues is one of the most consequential common divorce errors a spouse can make. The Illinois Marriage and Dissolution of Marriage Act contains hundreds of provisions across property division, maintenance, child support, and parenting allocation, and procedural missteps can result in permanently binding outcomes that cannot be easily modified.

An uncontested divorce with no children and minimal assets may be manageable without an attorney, particularly using the standardized forms available through Illinois Legal Aid Online. However, a contested divorce involving a $1 million marital estate, a family business, retirement accounts subject to QDRO division, and disputed parenting time requires legal representation to protect each party's interests. Attorney fees for Illinois divorces typically range from $10,000 to $30,000 for moderately complex cases and can exceed $50,000 for high-conflict litigation.

Illinois courts hold pro se litigants to the same procedural and evidentiary standards as licensed attorneys. A self-represented spouse who misses a discovery deadline, fails to properly value a pension, or waives maintenance rights without understanding the long-term financial impact may be bound by those errors for years or permanently.

What Not to Do During Divorce in Illinois: Quick Reference