Illinois Alimony & Spousal Maintenance

The approach

Illinois uses statutory maintenance guidelines in qualifying cases, but the court first determines whether maintenance is appropriate. High-income, unusual compensation, business-owner income and post-decree changes can require a more detailed analysis.

Guideline analysis

For qualifying cases under 750 ILCS 5/504, the statutory formula provides an amount and duration framework, subject to the court’s findings.

High-income cases

When the guideline framework does not apply, evidence concerning income, needs, lifestyle and earning capacity becomes more important.

Modification + termination

Job changes, retirement, income shifts and cohabitation allegations can produce post-decree litigation. The existing judgment controls the starting point.

How much alimony will I pay or receive in Illinois?

Illinois calls alimony spousal maintenance. There is no reliable answer from your salary alone. First, the court decides whether maintenance is appropriate. Then it considers the applicable calculation, both spouses’ income and financial circumstances, and the length of the marriage.

If the guidelines apply, the calculation uses statutory net income, not simply your gross salary or the amount deposited after payroll deductions. Start with the formula and worked example below, or use the Illinois maintenance calculator as a planning aid, not a prediction of an order.

I earn $150,000 and my spouse earns $60,000. Will I owe maintenance?

Those hypothetical gross salaries identify an income difference; they do not establish entitlement or the monthly amount. A long marriage with reduced career opportunities presents different facts from a short marriage in which both spouses have established careers. Bonuses, investment income, property awarded in the divorce and existing support obligations also matter.

Can I receive maintenance if I work full time?

A paycheck does not automatically rule out maintenance. The court considers income, needs, realistic earning capacity, the marital standard of living and other statutory factors. Conversely, earning less than your spouse does not automatically entitle you to support.

What should I bring to a first conversation?

Recent pay statements, available tax returns, bonus or equity award information, your marriage date, any existing support orders and a realistic monthly budget help frame the analysis. If your spouse controls the records, start with divorce when your spouse handles the finances; you do not need a complete financial file before seeking advice.

Is maintenance automatic when one spouse earns more?

No. The court first decides whether maintenance is appropriate under Section 504(a). Relevant factors include each spouse’s income and property, needs, realistic earning capacity, time needed for education or employment, marital standard of living, length of marriage, age and health, and contributions to the other spouse’s career.

A guideline calculation answers a later question. It does not establish entitlement simply because the incomes differ. A meaningful assessment starts with reliable income information and both parties’ reasonable financial needs.

Source: 750 ILCS 5/504(a). Legal sources checked September 27, 2026.

What is the Illinois guideline maintenance formula?

When maintenance is appropriate, the guideline framework generally applies if combined gross annual income is less than $500,000 and the payor has no obligation to pay child support, maintenance or both from a prior relationship, unless the court finds that applying the guidelines would be inappropriate.

The ordinary current guideline amount is 33⅓% of the payor’s net annual income minus 25% of the recipient’s net annual income. The amount, added to the recipient’s net income, cannot exceed 40% of the parties’ combined net income.

Illustration using net income: If annual net incomes are $120,000 and $40,000, the first calculation is $40,000 − $10,000 = $30,000. The cap is $64,000 of combined-income share, less the recipient’s $40,000, leaving $24,000 annually, or $2,000 monthly. This illustrates the amount calculation only; it assumes guideline eligibility and does not decide entitlement, duration or a deviation.

Gross salary and take-home pay are not substitutes for statutory net income. Our gross-income maintenance estimator supplies an estimate through stated assumptions. Existing orders, including certain pre-2019 tax-deductible orders, can require a different analysis. If guideline maintenance plus child support exceeds 50% of the payor’s net income, Section 504 permits a nonguideline determination; that provision is not an automatic universal cap.

Source: 750 ILCS 5/504(b-1) and (b-3). Legal sources checked September 27, 2026.

How long can maintenance last?

Guideline duration uses the marriage’s length when the divorce action starts, multiplied by the statutory factor. For illustration, a marriage of exactly 10 years uses .44, producing 4.4 years; exactly 15 years uses .64, producing 9.6 years. For 20 years or more, the statute permits a term equal to the marriage’s length or an indefinite term.

The applicable framework and the actual order still control. A fixed term, a reviewable award and an indefinite award do not mean the same thing. “Indefinite” does not mean immune from modification or termination. Read the duration and review language together with any agreement about modifiability.

Source: 750 ILCS 5/504(b-1)(1)(B), 504(b-2) and 510. Legal sources checked September 27, 2026.

What happens after remarriage, retirement or an income change?

Check the judgment and agreement first. Maintenance may be modifiable under the governing standards, or an agreement may limit modification. Retirement or a change in earnings is not permission to choose a new payment amount on your own.

Unless the parties agree otherwise in a written agreement incorporated into the judgment or otherwise approved by the court, future maintenance terminates upon either party’s death, the recipient’s remarriage, or the recipient’s cohabitation on a resident, continuing conjugal basis. Cohabitation requires a factual analysis; occasional overnight visits alone should not be treated as a complete legal test.

For a modification request, timing matters because Section 510 limits modification of installments to those accruing after due notice of the filing. Bring the current order, payment history and evidence of the claimed change to the consultation.

Source: 750 ILCS 5/502(f) and 510(a-5), (c). Legal sources checked September 27, 2026.

For contrasting cohabitation records, compare Miller and Saunders. Their different outcomes show why the overall relationship matters; separate homes or accounts alone do not decide the question.

Chicago + Chicagoland

Charles M. Wright represents family-law clients from Beermann LLP's Chicago office and serves matters in Cook County · Lake County · DuPage County · Will County · Kendall County · Kane County. County procedure matters, but the core discipline does not change: define the issue, develop the evidence, and make the legal argument fit the actual facts.

QUICK ANSWERS

Questions that come up early.

What is the current Illinois guideline formula?

For qualifying guideline awards, the amount is one-third of the payor’s net annual income minus one-quarter of the recipient’s net annual income. Maintenance plus the recipient’s net income cannot exceed 40% of the parties’ combined net income. Eligibility ordinarily requires combined gross annual income below $500,000 and no payor obligation for support from a prior relationship. Courts can depart from guidelines with findings. Certain older, tax-deductible orders use different rules.

Source: 750 ILCS 5/504(b-1), (b-2) and (b-4).

Does the formula always apply?

No. The court must first determine maintenance is appropriate, and the guideline framework has statutory eligibility requirements. The court can also deviate with findings.

Can maintenance change after divorce?

Retirement or an income change may support modification, but does not automatically erase the order. Unless the approved agreement provides otherwise, Section 510(c) addresses termination on death, the recipient’s remarriage, or resident, continuing conjugal cohabitation. Dating alone is not the statutory test. Read the complete judgment and obtain advice about the required proof and procedure before treating an obligation as ended.

Source: 750 ILCS 5/502(f) and 510(a-5), (c).

Maintenance with bonuses, uneven earnings or business income

The first question is whether maintenance is appropriate; the formula comes afterward. 750 ILCS 5/504 directs the court to consider the parties’ circumstances. Its guideline amount uses net income, with a combined gross-income threshold and prior-support conditions. A larger difference in salaries does not alone establish entitlement.

The maintenance calculator starts with gross annual income and shows its estimated net-income conversion. It is a planning tool for a defined wage-income scenario. It cannot decide disputed income, evaluate a business, or determine the effect of an agreement or an older maintenance order.

For recurring questions about changing bonuses, seasonal commissions and payment timing, read the bonus and commission income guide. Use the financial-records checklist to organize the supporting documents.

Build an income history that can be explained

Separate base salary, commissions, cash bonuses, deferred compensation and equity. Identify when a payment was earned, received and taxed. Keep records from comparable periods so the analysis does not compare one person’s best month with the other person’s annual average.

A hypothetical employee with a $150,000 salary and bonuses of $10,000, $40,000 and $0 over three years needs a different conversation from an employee receiving a fixed $30,000 bonus every year. Both require the plan documents and the reasons for variation. Historical averaging can be a useful discussion point; it should not be presented as a mandatory answer for every case.

Business owners need more than a W-2

Identify compensation, distributions, business-paid personal expenses and the records explaining available cash. Keep the business valuation issue separate from the support-income issue, while checking how the analyses interact. An accountant’s tax presentation and the legal support analysis may require reconciliation. See business-owner divorce and business income for child support.

Read the order before changing payments

An existing judgment may have provisions addressing additional compensation, reporting, review or modification. Bring the complete judgment and later orders, payment records, and the documents establishing the changed circumstances. The maintenance modification provisions in Section 510 require analysis of the applicable standard and the order; a new calculator result does not authorize self-help.

Prepare a timeline of income changes and the reasons for them.
Identify existing support duties and any relevant agreement.
Distinguish recurring income from unusual transactions.
Bring a realistic expense picture and information about employment prospects.
Ask how maintenance and child support interact before treating two separate estimates as a combined obligation.

Charles draws on Beermann’s resources to organize the legal, financial and practical work around your needs. A clear record helps the team address the real dispute and explain the assumptions behind any proposed amount.