Illinois 2026 Child Support Changes

by Anthony Abear

The Illinois Senate recently unanimously passed Senate Bill SB3524, a proposed law that
could significantly change how Illinois courts calculate child support in shared parenting
cases. If ultimately passed by the Illinois House and signed into law, the legislation is
expected to become effective January 1, 2027. For divorced and separated parents —
particularly those involved in substantial shared parenting arrangements — the proposed
revisions could have a major financial impact.

What Is the Current Illinois Law?

Under current Illinois law, the “shared physical care” child support calculation applies when
each parent exercises at least 146 overnights per year with the child (true overnights). If a
parent exercises fewer than 146 overnights, the standard child support guidelines (aka the
normal “child support multiplier”) will usually apply instead. However, if a parent enjoys
146 true overnights or more then the child support calculation is more gentle on the party
having less than the primary caretaker-parent; that is, the parent having fewer true
overnights than the primary care parent is accessed a lower multiplier based upon his/her
“sharing” the children more than 40% of the year (40% x 365 nights = 146 overnights).

Current Framework is Criticized

This framework has increasingly been criticized because many modern parenting schedules
involve substantial parenting time that does not neatly fit into traditional overnight
calculations.
For example:

• after-school parenting time,
• evening parenting time,
• late-night parenting time,
• extensive weekend time,
• or split-day parenting schedules.

The “Overnight Equivalent” Standard:

The Proposed “Overnight Equivalent” Standard SB3524 attempts to address this issue b
introducing the concept of “overnight equivalents.”
Under the proposed legislation, Illinois courts would be permitted to consider significant
parenting periods occurring on separate days — even where the child does not actually
sleep overnight with the parent.

The bill specifically provides that overnight equivalents may be used if the parent has
significant parenting time periods on separate days in which the child is in the parent’s
physical care and under the direct care of that parent but does in fact actually not stay
overnight. This represents a potentially substantial shift in Illinois family law.

In practical terms, a parent who regularly exercises:

• after-school parenting time,
• dinner parenting time,
• evening parenting time,
• late return parenting schedules,
• or substantial daytime parenting responsibilities,
  

may now receive recognition for that parenting time within the child support calculation.

Illinois Appears to Be Following a National Trend

Illinois is not alone in moving toward recognition of “overnight equivalent” parenting schedules. Several other states already recognize variations of this concept. Examples include:

Indiana:

Indiana applies a shared parenting calculation beginning at approximately 52 overnights or overnight equivalents annually.

Maryland and Colorado:

Maryland and Colorado utilize calculations beginning at approximately 92 overnights or equivalent parenting periods.

States recognizing overnight equivalents include:

• Minnesota
• Indiana
• Maryland

Additional Important Changes Proposed by SB3524

1. Shared Parenting Formula Changes

The legislation proposes:

• multiplying the basic support obligation by 1.5 in shared care cases,
• allocating support proportionally based upon each parent’s income,
• offsetting the parties’ obligations against one another,
• and creating a statutory adjustment table for parenting arrangements involving fewer than 146 overnights or overnight equivalents.

Importantly, the legislation also proposes that the adjusted shared parenting obligation may not exceed what would otherwise have been ordered under the standard guideline calculation.

2. Incarcerated Parents

SB3524 would create a rebuttable presumption that a parent incarcerated for more than 180 days lacks the ability to pay child support.

3. Minimum Child Support Presumption

The legislation also proposes a rebuttable presumption establishing minimum child support of $40 per month, per child, for obligors whose income falls at or below 100% of the federal poverty guidelines for a single-person household.

4. Annual Income Exchange Requirements

The bill would further require:

• annual exchanges of income information between parents,
• notification within 10 days of obtaining new employment,
• notification within 10 days of employment termination,
• and written verification of net income.

Why All This Matters

If enacted, SB3524 could substantially affect:

• child support obligations,
• parenting schedule negotiations,
• mediation strategy,
• settlement agreements,
• modification proceedings,
• and trial presentations involving parenting time.

For many parents, the proposed legislation recognizes a reality long argued in Illinois courts: substantial parenting responsibilities do not always occur through traditional overnight schedules.

Final Thoughts

The Illinois Senate Bill passed unanimously– and that should not be taken lightly. However, SB3524 has already passed the Illinois Senate unanimously, the legislation must still pass the Illinois House and ultimately be signed into law before taking effect.

But the bill’s unanimous Senate approval strongly suggests significant legislative momentum.

Parents presently involved in:

• custody disputes,
• parenting time litigation,
• child support modification proceedings,
• or shared parenting negotiations

should closely monitor further developments concerning this legislation.

If passed and signed into Illinois law, SB3524 may become one of the more significant Illinois child support revisions in years.