An Illinois divorce is, at its heart, a financial event. The legal process matters, but most of the decisions that shape your next ten years are about money: who keeps the house, how retirement accounts are split, whether support is paid and for how long. This guide walks through how Illinois handles each of those questions so you can plan with a clear head instead of guessing.
Illinois divides property by equitable distribution, which is fair, not automatically equal. Spousal maintenance follows a formula for most couples, and child support runs on the income shares model based on both parents' incomes.
How Illinois divides property
Illinois is an equitable distribution state, not a community property state. The court divides marital property fairly, weighing the 12 statutory factors in 750 ILCS 5/503, which can produce an unequal split. Non-marital property, owned before the marriage or received by gift or inheritance, generally stays with its owner, though it can become marital if commingled.
The house and the retirement accounts
The two biggest assets in most divorces are the family home and retirement savings. A retirement account built up during the marriage is marital property even if it is in one spouse's name, and dividing certain accounts takes a separate court order so the transfer is not taxed as an early withdrawal. Debts are divided too. Trading the house for the retirement account is a common move that can quietly cost a great deal if the after-tax values are not compared properly. Modeling these trade-offs before you agree to anything is exactly the kind of decision Your Divorce Angel is built to help you see clearly.
Spousal maintenance
For most couples, Illinois sets maintenance with a formula. Under 750 ILCS 5/504, when the parties' combined gross income is under $500,000, maintenance equals 33 1/3% of the payer's net income minus 25% of the payee's net income. There is a cap: the result, added to the payee's own net income, cannot leave the payee with more than 40% of the combined net income. Above $500,000 combined, the court decides based on statutory factors rather than the formula.
Duration is the length of the marriage multiplied by a statutory factor that grows with the marriage, from 0.20 at five years to about 0.80 at twenty years. For marriages of 20 years or more, the court can order maintenance for a period equal to the marriage or for an indefinite term.
For divorce or separation agreements signed after December 31, 2018, spousal support is not deductible for the person paying and not taxable income for the person receiving it, under the federal Tax Cuts and Jobs Act. This changes the real cost and value of every support number, so pre-tax and after-tax figures should never be confused at the negotiating table.
Child support
Illinois uses the income shares model under 750 ILCS 5/505. Rather than a flat percentage of one parent's income, it estimates what the parents would have spent on the children together, based on both parents' combined net income and a statewide schedule, then divides that responsibility in proportion to each parent's income. When parents share parenting time heavily (146 or more overnights a year), a shared-parenting adjustment applies. The schedule is updated periodically, most recently in 2025.
The financial timeline
Two things people consistently underestimate: how long the process takes and how much costs rise once you are running a household alone. A realistic financial sequence:
- Before filing — gather a complete picture of assets, debts, income, and expenses. Every later decision rests on these.
- Temporary orders — temporary support and living arrangements while the case proceeds.
- Disclosure and negotiation — both sides exchange financial information; settlement scenarios get modeled and compared.
- Settlement or trial — most Illinois divorces settle. The ones that go to trial cost more and hand the decisions to a judge.
- After the judgment — the distribution, support, and any account transfers are carried out.
Illinois divorce finance, at a glance
| Property division | Equitable distribution; 12 factors (750 ILCS 5/503); not automatically 50/50 |
|---|---|
| Maintenance formula | 33 1/3% of payer net minus 25% of payee net (combined income under $500k) |
| Maintenance cap | Payee total may not exceed 40% of combined net income |
| Maintenance duration | Marriage length × statutory factor (0.20 to 0.80); 20+ yrs may be indefinite |
| Child support | Income shares model (750 ILCS 5/505), both parents' incomes |
| Support tax (post-2018) | Not deductible by payer; not taxable to recipient |
Questions worth asking before you negotiate
- What is the full marital estate, and which assets are actually separate property?
- If we trade the house for the retirement account, are we comparing after-tax values?
- Given our incomes and the length of the marriage, what is the realistic range for support?
- What will my true monthly cost of living be once I am on my own?
- What does each settlement scenario look like five and ten years out, not just on signing day?
Illinois divorce: common questions
Is Illinois a community property state?
No. Illinois is an equitable distribution state. Marital property is divided fairly based on 12 statutory factors under 750 ILCS 5/503, which can mean an unequal split, not an automatic 50/50. Non-marital property, owned before the marriage or received by gift or inheritance, is generally not divided.
How is spousal maintenance calculated in Illinois?
For couples with a combined gross income under $500,000, maintenance follows a formula under 750 ILCS 5/504: 33 1/3 percent of the payer's net income minus 25 percent of the payee's net income. The result is capped so that the payee's total income does not exceed 40 percent of the parties' combined net income. Above $500,000 combined, the court decides based on statutory factors.
How long does maintenance last in Illinois?
Duration is set by multiplying the length of the marriage by a statutory factor that increases with the length of the marriage, from 0.20 at five years up to about 0.80 at twenty years. For marriages of 20 years or more, the court can order maintenance for a period equal to the length of the marriage or for an indefinite term.
How is child support calculated in Illinois?
Illinois uses the income shares model under 750 ILCS 5/505. Support is based on both parents' combined net income and a statewide schedule, then divided between them in proportion to their incomes, with adjustments for shared parenting time.
Is spousal support taxable in Illinois?
For agreements signed after December 31, 2018, maintenance is not deductible by the paying spouse and not taxable income to the receiving spouse, under federal law.
See your Illinois numbers before you decide
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This guide is general financial information about divorce in Illinois and reflects Illinois law as of the date noted. It is not legal advice, and laws and individual circumstances change. Always consult a licensed Illinois attorney for advice specific to your situation.