Child support for 1 child in Illinois

Illinois guidelines effective March 20, 2026. Illinois overview

For 1 child, with Parent A earning $60,000 and Parent B $40,000, Illinois's guideline amount is $761 a month (Parent A pays Parent B).

This is the guideline amount, not a court order.

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Guideline child support

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Child support for 1 child in Illinois by income

Monthly guideline amount for 1 child by Parent A's and Parent B's yearly income; the child lives mostly with Parent B (Parent A has 52 overnights a year).
Parent A income	Parent B $0	Parent B $30,000	Parent B $50,000	Parent B $80,000
$20,000	$323	$321	$311	$272
$25,000	$403	$402	$382	$331
$30,000	$472	$470	$435	$379
$35,000	$541	$536	$485	$428
$40,000	$622	$599	$539	$485
$45,000	$691	$656	$588	$538
$50,000	$760	$701	$638	$590
$55,000	$829	$750	$684	$645
$60,000	$899	$790	$726	$691
$65,000	$963	$833	$767	$731
$70,000	$1,025	$878	$815	$771
$75,000	$1,067	$908	$859	$806
$80,000	$1,110	$937	$902	$844
$90,000	$1,168	$1,009	$984	$924
$100,000	$1,228	$1,101	$1,058	$998
$120,000	$1,337	$1,256	$1,198	$1,123
$150,000	$1,561	$1,449	$1,377	$1,356
$200,000	$1,849	$1,782	$1,746	$1,690
$250,000	$2,172	$2,096	$2,048	$1,989

Parenting time and child support for 1 child

Monthly guideline amount for 1 child by Parent A's income and overnights a year with Parent A; Parent B earns $40,000. "B→A" means Parent B pays.
Parent A income	0 nights	52 nights	104 nights	128 nights	182 nights
$20,000	$317	$317	$317	$317	$213 B→A
$25,000	$394	$394	$394	$394	$152 B→A
$30,000	$456	$456	$456	$456	$98 B→A
$35,000	$514	$514	$514	$514	$47 B→A
$40,000	$571	$571	$571	$571	$9
$45,000	$617	$617	$617	$617	$38
$50,000	$661	$661	$661	$661	$83
$55,000	$715	$715	$715	$715	$131
$60,000	$761	$761	$761	$761	$173
$65,000	$797	$797	$797	$797	$209
$70,000	$835	$835	$835	$835	$246
$75,000	$870	$870	$870	$870	$278
$80,000	$908	$908	$908	$908	$310
$90,000	$1,003	$1,003	$1,003	$1,003	$383
$100,000	$1,084	$1,084	$1,084	$1,084	$451
$120,000	$1,219	$1,219	$1,219	$1,219	$568
$150,000	$1,411	$1,411	$1,411	$1,411	$729
$200,000	$1,765	$1,765	$1,765	$1,765	$1,009
$250,000	$2,067	$2,067	$2,067	$2,067	$1,251

How the number of children changes the amount in Illinois

For one child, the guideline amount ranges from $317 a month when Parent A earns $20,000 to $2,067 a month at $250,000, with Parent B earning $40,000.

Illinois uses the income shares model: the schedule gives the support for the parents' combined net income, and the paying parent pays their percentage share.

Frequently asked questions

How much is child support for 1 child in Illinois on $50,000?

If Parent A earns $50,000 a year, Parent B earns $40,000 and the child lives mostly with Parent B, Illinois's guideline amount is about $661 a month (Parent A pays Parent B).

How much is child support for 1 child in Illinois on $100,000?

If Parent A earns $100,000 a year, Parent B earns $40,000 and the child lives mostly with Parent B, the guideline amount is about $1,084 a month (Parent A pays Parent B).

How much more is child support for 1 child than for one child in Illinois?

This page is for one child. With the same incomes, the guideline amount for two children is about $1,142 a month.

Does equal parenting time change child support for 1 child in Illinois?

With about equal parenting time and the same incomes ($60,000 and $40,000), the guideline amount is about $173 a month (Parent A pays Parent B), against $761 when Parent A has 52 overnights a year. When each parent has at least 146 overnights a year, the basic obligation is multiplied by one and a half, shared by income and offset by each parent's time.

Official sources and verification

Guidelines effective March 20, 2026. Verified against the official Illinois sources on October 6, 2026. How we calculate →