How Illinois Divides Property in Divorce (750 ILCS 5/503)

Illinois divides property in a divorce by "equitable distribution," which means fair rather than automatically equal. The court first gives each spouse his or her non-marital property. It then divides the marital property, including marital debt, "in just proportions" after weighing the factors in 750 ILCS 5/503(d), and it does so without regard to marital misconduct. Almost everything acquired during the marriage, including retirement benefits and stock awards, is presumed marital no matter whose name is on it.

Is Illinois a 50/50 divorce state?

No. Illinois is not a community property state. The court divides marital property "in just proportions considering all relevant factors" (750 ILCS 5/503(d)). The twelve listed factors include each spouse's contribution to the property, including as a homemaker; dissipation; the length of the marriage; each spouse's economic circumstances, including the desirability of awarding the family home to the parent with whom the children primarily live; any prenuptial or postnuptial agreement; each spouse's age, health, income, employability, and needs; whether the award is in lieu of or in addition to maintenance; each spouse's opportunity to acquire assets and income in the future; and the tax consequences.

Depending on how those factors line up, the result may be an equal split or an unequal one. Marital misconduct, such as an affair, is not a factor. Spending marital money on non-marital purposes while the marriage is breaking down can be, as dissipation.

What counts as marital property in Illinois?

"Marital property" is all property, including debts, acquired by either spouse after the marriage (750 ILCS 5/503(a)). Property acquired before the judgment is presumed marital, including assets titled in one name and non-marital property one spouse put into joint ownership. The presumption is overcome only by clear and convincing evidence that the property fits a non-marital category or, for transfers between spouses, that no gift was intended (750 ILCS 5/503(b)(1)).

Non-marital property includes (750 ILCS 5/503(a)):

• gifts and inheritances, and property acquired in exchange for them;
• property acquired before the marriage or in exchange for premarital property (retirement plans with both marital and non-marital parts are handled separately);
• property acquired after a judgment of legal separation;
• property excluded by a valid prenuptial or postnuptial agreement;
• the increase in value of non-marital property, subject to reimbursement; and
• income from non-marital property that is not attributable to a spouse's personal effort.

The court must make specific findings on how it classified and valued each asset (750 ILCS 5/503(a)). For a deeper look at classification disputes, see marital vs. non-marital property in Illinois.

What happens when marital and non-marital money are mixed?

Under section 503(c)(1), property contributed from one estate into the other that loses its identity transmutes into the receiving estate; property that keeps its identity does not. Funds from both estates combined into a new asset so that neither can be identified become marital.

The contributing estate is still reimbursed, but only for contributions traceable by clear and convincing evidence that were not gifts. When a spouse's personal effort substantially increases the value of non-marital property, the marital estate can be reimbursed unless it was already reasonably compensated (750 ILCS 5/503(c)(2)). The Illinois Supreme Court has held that no reimbursement is owed when the marital estate was already compensated through its use of the non-marital property during the marriage (In re Marriage of Crook, 211 Ill. 2d 437 (2004)). To keep an inheritance or premarital account separate, hold it in your name alone, keep the statements, and do not deposit marital income into it.

How are retirement accounts and pensions divided in an Illinois divorce?

All pension benefits, including public pensions, defined benefit and defined contribution plans, IRAs, and non-qualified plans, that either spouse acquired or participated in during the marriage are presumed marital. The presumption is overcome only by clear and convincing evidence that the benefits were acquired by a non-marital method (750 ILCS 5/503(b)(2)). Accruals before the marriage are generally non-marital, so many plans must be split into marital and non-marital parts.

Finding the marital share. Under the approach described in In re Marriage of Hunt, 78 Ill. App. 3d 653 (1979), the marital share is a fraction: the years (or months) of marriage during which the benefit accrued, divided by the total years (or months) of accrual. The court then uses one of two methods:

• Immediate offset. The court puts a present value on the marital share using actuarial evidence, awards the plan to the employee spouse, and gives the other spouse offsetting marital property.
• Deferred division ("if, as and when"). When valuation is uncertain or other property is insufficient, the court awards each spouse a percentage of each payment's marital portion and keeps jurisdiction.

401(k)s, 403(b)s, and private pensions: QDROs. Federal law generally bars assigning benefits under private employer pension plans, with an exception for a "qualified domestic relations order," or QDRO (29 U.S.C. 1056(d)(3)). The order must clearly specify the parties, the amount or percentage awarded, the payment period, and the plan, and it cannot require a form of benefit the plan does not offer or increased benefits (26 U.S.C. 414(p)). The divorce judgment awards the share, but the plan pays the alternate payee only under an order determined to be a QDRO. Our guide to QDROs in Illinois divorce walks through the process.

IRAs. An IRA is divided by transfer, not by QDRO. A transfer of an IRA interest to a spouse or former spouse under a divorce decree or written instrument incident to it is not a taxable transfer, and the transferred share becomes the receiving spouse's IRA (26 U.S.C. 408(d)(6)).

Early withdrawals. A distribution paid to an alternate payee under a QDRO is exempt from the 10% additional tax on early distributions (26 U.S.C. 72(t)(2)(C)), but that exception does not apply to distributions from IRAs (26 U.S.C. 72(t)(3)(A)). Regular income tax can still apply.

Illinois public pensions: QILDROs. Pensions under Articles 2 through 18 of the Illinois Pension Code, which cover systems such as the Teachers' Retirement System, the State Employees' Retirement System, the Illinois Municipal Retirement Fund, and police and firefighter pension funds, are divided with a Qualified Illinois Domestic Relations Order, or QILDRO, which is not the same as a QDRO (40 ILCS 5/1-119(a)(6)). Key limits:

• it cannot change the vesting, amount, or timing of any benefit, and it does not reach survivor's, disability, life insurance, or health insurance benefits (40 ILCS 5/1-119(b)(3)-(4));
• for systems whose benefits are exempt from attachment, a member who began participating before the QILDRO statute took effect must sign a written consent before the order is effective (40 ILCS 5/1-119(m)); and
• the value of a Pension Code benefit is determined using the retirement system's own valuation procedures (750 ILCS 5/503(b)(2)).

Social Security. The Illinois Supreme Court held that Social Security benefits "may not be divided directly or used as a basis for an offset during state dissolution proceedings," and declined to let courts consider anticipated benefits as a factor in dividing other property (In re Marriage of Crook, 211 Ill. 2d 437 (2004)).

Stock options and restricted stock. Awards granted during the marriage are presumed marital, vested or not. The court allocates them at judgment, considering the vesting schedule and whether the grant rewarded past, present, or future work (750 ILCS 5/503(b)(3)).

Life insurance. The court allocates marital life insurance at judgment. Afterward, a designation of the former spouse as beneficiary is ineffective unless the judgment names the former spouse, the insured re-designates the former spouse, or the former spouse is designated to receive the proceeds for the benefit of a child or dependent. That rule does not apply to ERISA or federal employee group life policies (750 ILCS 5/503(b-5)).

What is dissipation, and how do you claim it?

The Illinois Supreme Court defines dissipation as the "use of marital property for the sole benefit of one of the spouses for a purpose unrelated to the marriage at a time that the marriage is undergoing an irreconcilable breakdown" (In re Marriage of O'Neill, 138 Ill. 2d 487 (1990)). A spouse claiming dissipation must (750 ILCS 5/503(d)(2)):

• serve a notice of intent to claim dissipation no later than 60 days before trial or 30 days after discovery closes, whichever is later;
• state when the marriage began undergoing an irretrievable breakdown, identify the property dissipated, and state when the dissipation occurred; and
• file a certificate of service with the clerk.

The statute also limits how far back a claim reaches: "no dissipation shall be deemed to have occurred prior to 3 years after the party claiming dissipation knew or should have known of the dissipation, but in no event prior to 5 years before the filing of the petition for dissolution of marriage." Separately, either spouse can ask the court for a temporary restraining order or preliminary injunction against transferring, encumbering, or concealing property outside the usual course of business or necessities of life (750 ILCS 5/501(a)(2)). More detail is in our article on dissipation of marital assets in Illinois.

How are businesses and high-net-worth estates divided?

High-asset cases follow the same statute, but valuation becomes the main fight.

• Valuation standard and date. The court uses fair market value. The valuation date is the trial date unless the parties agree or the court orders another date (750 ILCS 5/503(k)). The court may consult its own financial experts and allocate their fees based on each party's ability to pay (750 ILCS 5/503(l)).
• Goodwill. Enterprise goodwill that exists independently of the owner is a divisible business asset. Personal goodwill that depends on the owner's own efforts and ends when that involvement ends is not property (In re Marriage of Talty, 166 Ill. 2d 232 (1995)).
• Disclosure. In In re Marriage of Brubaker, 2022 IL App (2d) 200160, a former husband sought to vacate a judgment after learning of an undisclosed lakefront condominium worth over $800,000. The appellate court held that his waiver of formal discovery did not show a lack of due diligence as a matter of law and sent the case back. Formal discovery in the original case is the safer course.
• The marital home before judgment. Section 501 allows a sale before the final judgment "only in extraordinary circumstances, where such a sale is required to otherwise maintain the status quo" (In re Marriage of Gabrys, 2023 IL App (1st) 221763). See our article on forced sale of the home during an Illinois divorce.

Do prenuptial and postnuptial agreements control the division?

Usually. Property excluded by a valid prenuptial or postnuptial agreement is non-marital (750 ILCS 5/503(a)(4)), and any agreement is a factor in dividing the rest (750 ILCS 5/503(d)(7)). A premarital agreement is unenforceable only if the challenger proves it was not signed voluntarily, or that it was unconscionable when signed and the challenger received no fair disclosure, did not waive disclosure in writing, and lacked adequate knowledge of the other's finances. Unconscionability is a question of law for the court (750 ILCS 10/7). For postnuptial agreements, Illinois courts ask whether the agreement is procedurally or substantively unconscionable. In In re Marriage of Prill, 2021 IL App (1st) 200516, the appellate court affirmed enforcement of a postnuptial agreement signed after the wife said she wanted a divorce. The trial judge called it "not fair" but found it not unconscionable, and the appellate majority agreed over a dissent.

What are the tax consequences of dividing property?

• No gain or loss is recognized on a transfer between spouses, or between former spouses incident to the divorce, and the receiving spouse takes the transferor's tax basis (26 U.S.C. 1041). Two assets of equal value can carry very different built-in tax costs.
• On the sale of a principal residence, up to $250,000 of gain ($500,000 on a qualifying joint return) can be excluded if the ownership and two-of-five-years use tests are met. A spouse who still owns the home is treated as using it during periods when the other spouse is granted use of it under a divorce or separation instrument (26 U.S.C. 121(b), (d)(3)).

Because the court must consider tax consequences (750 ILCS 5/503(d)(12)), put tax evidence in the record.

What should I do now to protect my share?

1. Collect current statements for every account, retirement plan, and loan, plus recent tax returns.
2. Gather proof for anything you claim is non-marital: premarital statements, inheritance records, gift letters, and the paper trail tracing those funds.
3. Ask each retirement plan for its QDRO procedures, or the public system's QILDRO requirements, early.
4. Do not move, spend, or retitle significant marital assets outside ordinary living expenses.
5. Log unexplained withdrawals or transfers with dates, and calendar the dissipation-notice deadline.
6. Review beneficiary designations with your lawyer before and after the judgment.

When should I talk to a lawyer?

• Either spouse owns a business or receives stock options or restricted stock.
• Either of you has a pension, especially an Illinois public pension that requires a QILDRO.
• You brought significant assets into the marriage or received an inheritance.
• Money is disappearing, or you suspect assets are being hidden.
• You are being asked to sign a prenuptial, postnuptial, or marital settlement agreement.

To talk through your situation with Jonathan D. Steele, call (312) 621-4394 or reach out through the contact page.

Sources

• Illinois Marriage and Dissolution of Marriage Act, 750 ILCS 5/501, 503: ilga.gov
• Illinois Uniform Premarital Agreement Act, 750 ILCS 10/7: ilga.gov
• Illinois Pension Code, 40 ILCS 5/1-119 (QILDROs): ilga.gov
• Federal law: 29 U.S.C. 1056(d)(3); 26 U.S.C. 414(p); 26 U.S.C. 408(d)(6); 26 U.S.C. 72(t); 26 U.S.C. 1041; 26 U.S.C. 121
• Cases: In re Marriage of Crook, 211 Ill. 2d 437 (2004); In re Marriage of Hunt, 78 Ill. App. 3d 653 (1979); In re Marriage of O'Neill, 138 Ill. 2d 487 (1990); In re Marriage of Talty, 166 Ill. 2d 232 (1995); In re Marriage of Brubaker, 2022 IL App (2d) 200160; In re Marriage of Gabrys, 2023 IL App (1st) 221763; In re Marriage of Prill, 2021 IL App (1st) 200516

This article explains general Illinois law as of October 2026. It is not legal advice about your situation, and reading it does not create an attorney-client relationship.

Written by Jonathan D. Steele

Chicago divorce attorney with cybersecurity certifications (Security+, ISC2 CC, Google Cybersecurity Professional Certificate). Illinois Super Lawyers Rising Star 2016-2025.

Request Conflict Check

For more insights, read our Divorce Decoded blog.