Practice Areas
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Resolution & beyond
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Modification of Support
Modification of Support
Attorney in Illinois
As an Illinois support modification attorney, I see this regularly: when income, employment, or family circumstances change significantly, the support obligations established in your original divorce or parentage judgment may no longer reflect reality. Illinois law provides a defined path to revisit them — from both sides.
Support orders reflect a moment in time — life doesn't stop there.
Child support and spousal maintenance orders are based on the financial circumstances of the parties at the time they're entered. When those circumstances change substantially — a job loss, a significant raise, a new business venture, retirement, or a major shift in a child's needs — the order may no longer be appropriate. Illinois law allows modification of both types of support when the threshold is met.
We handle support modification petitions from both sides. If you're seeking a reduction because your circumstances have genuinely changed, we'll pursue it aggressively. If you're defending against a modification you believe isn't warranted, we'll make the petitioning party prove it. And if you're in a situation where modification is appropriate but the other party is resisting reasonable negotiation, we're prepared to take it to a hearing.
The most important thing to understand about support modifications: they are generally not retroactive to a date before the petition was filed. Delay costs money. When circumstances warrant a modification, the right time to file is as soon as the threshold is met.
File Promptly — Modifications Are Not Retroactive
Illinois courts generally cannot modify child support or maintenance to a date before the petition was filed. Every month of delay means the current order continues to accrue at the existing amount — and that obligation is not erased by a modification entered later. If your circumstances have changed and modification is warranted, the filing date matters. We advise on timing as part of every modification engagement.
Child Support vs. Maintenance
Two types of support — two different modification standards.
Child support and spousal maintenance are both modifiable — but they follow different legal standards, different triggers, and different procedural paths. Understanding which applies to your situation shapes everything about how the matter proceeds.
Child Support Modification
The General Standard
A substantial change in the financial circumstances of either parent or in the needs of the child. Courts evaluate whether the change is meaningful, whether it is likely to be permanent, and whether it justifies departing from the existing order.
The Three-Year Rule
Illinois law presumes a substantial change when three years have passed since the last order, or when the current order would change by more than 20% under the present guidelines applied to current income figures. Either trigger independently supports a modification petition.
Common Grounds
Job loss or significant income reduction. Promotion or new employment at significantly higher income. Change in parenting time allocation that affects the income shares calculation. Significant change in the child's healthcare, educational, or activity expenses.
Imputed Income
Courts can impute income to a parent who is voluntarily unemployed or underemployed — meaning they assign that parent an income based on their earning capacity rather than their actual income. We address imputed income arguments on both sides of modification petitions.
Spousal Maintenance Modification
The General Standard
A substantial change in circumstances since the original award — which can include a significant change in either party's income, a change in the financial need of the receiving spouse, or a change in the paying spouse's ability to pay. The analysis is holistic and fact-specific.
Non-Modifiable Awards
If the original maintenance award was expressly labeled non-modifiable in the settlement agreement, the court's ability to revisit it is severely limited. The specific language of the original order governs. We analyze the original agreement carefully at the outset of every maintenance modification inquiry.
Termination Grounds
Maintenance terminates automatically on the death of either party or the remarriage of the receiving spouse. Cohabitation of the receiving spouse on a resident, continuing, conjugal basis is also statutory grounds for termination — but requires a court proceeding to establish and must be proven with evidence.
Retirement
Retirement — whether voluntary or mandatory — can constitute a substantial change in circumstances. Courts evaluate whether the retirement is in good faith, what retirement income will be available, and whether the circumstances of the parties justify continued maintenance in the same amount.
On Voluntary Income Reductions
Courts are appropriately skeptical of support modification requests based on voluntary income reductions — particularly when the timing of the reduction coincides with a modification proceeding. A parent who voluntarily leaves a high-paying job shortly before seeking a reduction in child support may face an imputed income argument. We advise clients honestly about how courts are likely to view the circumstances before filing.
Duration Guidelines
Pursuing a modification —
or defending against one.
Support modification is an adversarial proceeding when the parties disagree. We handle it from both perspectives — and the approach differs significantly depending on which side of the petition you're on.
If you're seeking a modification
The most important steps happen before the petition is filed. We assess whether your circumstances genuinely meet the threshold, identify the strongest factual basis for the petition, and advise on timing — because the filing date determines when any modification becomes effective.
Once filed, we build the evidentiary record to support the claimed change in circumstances, address anticipated arguments from the other side — including imputed income and voluntary reduction claims — and pursue negotiated resolution where possible without sacrificing position.
If the other party refuses reasonable modification despite clear changed circumstances, we proceed to a hearing prepared to demonstrate to the court exactly why the current order no longer reflects reality.
If you're defending against a modification
Defending a modification petition starts with a careful analysis of whether the claimed change in circumstances genuinely meets the legal threshold — and whether the petition is supported by accurate financial disclosure. Many modification petitions overstate the change, mischaracterize voluntary decisions as forced circumstances, or are filed before the threshold is actually met.
We challenge threshold arguments, address imputed income where appropriate, and present the full financial picture to the court. In maintenance modifications, we analyze the specific language of the original agreement to assess what the court can and cannot modify.
Unreasonable modification petitions can themselves support a request for attorney fee awards — which we pursue in appropriate cases.
What clients ask about support modifications in Illinois.
These are the questions prospective clients most often raise before their first consultation. We've answered them honestly — because informed clients make better decisions, and that's better for everyone.
Remarriage or Death
Maintenance terminates automatically upon the death of either party or the remarriage of the receiving spouse. These are statutory termination events that cannot be contracted around in most circumstances — though the original agreement may address how other obligations are handled in these events.
Cohabitation
Under 750 ILCS 5/510(c), maintenance terminates when the receiving spouse cohabitates with another person on a resident, continuing, conjugal basis. Proving cohabitation requires evidence of the nature and stability of the relationship — not just that the receiving spouse spends time with a partner. We have experience pursuing and defending cohabitation termination claims.
Substantial Change in Circumstances
Maintenance can be modified — upward or downward — when there has been a substantial change in circumstances since the original award. Significant changes in either party's income, loss of employment, retirement, or a material change in financial need can all support a modification petition. The specific language of the original maintenance order significantly affects what modification is available.
What clients ask about support modifications in Illinois.
These are the questions prospective clients most often raise before their first consultation. We've answered them honestly — because informed clients make better decisions, and that's better for everyone.
I lost my job three months ago. Can I modify child support now?
Potentially — a significant job loss can constitute a substantial change in circumstances supporting a modification petition. The analysis depends on the nature of the job loss (layoff vs. voluntary resignation), how long ago it occurred, whether you're actively seeking comparable employment, and what income you have now versus when the order was entered. Courts are more receptive to modifications based on involuntary job loss than voluntary career changes. We assess the specific facts at the first consultation and advise on both the threshold question and whether the timing is right to file.
My ex received a large raise. Can I increase child support?
Yes — a significant increase in either parent's income can support a modification of child support. Illinois uses an income shares model, which means both parents' incomes factor into the calculation. If the paying parent's income has increased significantly since the last order, the support obligation may increase. If the receiving parent's income has increased substantially, the obligation may decrease. Either way, the three-year rule and the 20% deviation threshold also apply — either can independently support a petition without requiring a showing of a specific changed circumstance.
What happens to maintenance if I remarry?
Under Illinois law, spousal maintenance terminates automatically upon the remarriage of the receiving spouse. The paying spouse does not need to return to court to terminate the obligation — though it's prudent to obtain a court order confirming termination to avoid any dispute about arrears. If you are the paying spouse and your ex has remarried without notifying you, contact us promptly to address any overpayments that may have occurred after the remarriage date.
My ex is cohabiting with a partner. Can maintenance be terminated?
Cohabitation is a statutory ground for maintenance termination in Illinois — but it requires a court proceeding and must be proven with evidence. The cohabitation must be on a resident, continuing, conjugal basis — meaning a serious, ongoing romantic relationship involving shared living arrangements, not casual dating. Proving cohabitation requires documentation: shared address, shared expenses, time spent together, the nature of the relationship. We build cohabitation termination cases carefully and advise on the evidence needed before filing.
How does the three-year rule work for child support?
Illinois law presumes a substantial change in circumstances — independently of any actual financial change — when either three years have passed since the last child support order, or when the current order would change by more than 20% if the current guidelines were applied to the parties' current incomes. Either threshold independently supports a modification petition, even if nothing dramatic has changed in either party's financial situation. This is a relatively low bar that many families qualify for without realizing it — which is why a periodic review of child support orders makes sense.
Can I modify support by agreement without going to court?
The parties can agree on a modification — but that agreement must be entered as a court order to be enforceable. An informal agreement to pay less than what's owed under the current order does not modify the legal obligation. If the paying party stops paying the full amount based on a verbal or informal agreement and the other party later changes their mind, arrears will have been accumulating at the original order amount the entire time. Any agreed modification must be put in writing, signed by both parties, and submitted to the court for entry as a new order.
"Support orders are based on a moment in time. When that moment substantially changes, the order should too."
Support Modification Attorney Serving Chicagoland
O'Brien Family Law handles child support and spousal maintenance modification petitions throughout Cook, DuPage, Kane, Kendall, Lake, and Will County — from both sides. We appear regularly in the circuit courts of each county and understand how local judges approach modification proceedings.
Whether your original order came from Wheaton, Geneva, Joliet, Waukegan, or Yorkville, we're positioned to pursue or defend modifications efficiently and effectively from the first consultation forward.
File promptly —
delay costs money.
Support modifications are not retroactive to before the petition is filed. The sooner we assess your situation, the sooner we can act if the threshold is met.
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