Child Support If You Make $1,000 a Week in Illinois
Illinois does not split the basic obligation evenly. It splits it in proportion to each parent share of the combined net income, and at $1,000 a week that proportion moves a lot across the table below.
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Guideline child support scenarios at $1000 a week
The paying parent earns $1000 a week ($4,333.33 a month) in every cell below. The other parent's monthly income changes across rows, and the number of children changes across columns; both genuinely change the result.Every figure is computed with the real Illinois guideline engine, the same one behind the full calculator, not a lookup table built for this page.
| Other parent's income | 1 child | 2 children | 3 children |
|---|---|---|---|
| No reported income | Not available: the Illinois gross-to-net conversion table does not cover this monthly gross income; adjust the income values above | Not available: the Illinois gross-to-net conversion table does not cover this monthly gross income; adjust the income values above | Not available: the Illinois gross-to-net conversion table does not cover this monthly gross income; adjust the income values above |
| $2,000 a month | $752.72 | $1,134.76 | $1,358.51 |
| $4,000 a month | $665.78 | $998.92 | $1,189.74 |
| $6,000 a month | $617.71 | $913.24 | $1,070.95 |
Every dollar figure is a monthly amount, the presumptive guideline result before add-ons like child care or health insurance and before any court deviation. "Not available" means the engine behind this site declined to compute that specific combination rather than guess; the reason is shown next to it.
How the proportional split actually works
After both parents gross pay is converted to standardized net income and combined into one total, Illinois looks up the basic support obligation for that combined figure and the number of children. The paying parent share of that obligation equals their share of the combined net income, not a flat percentage set by statute.
At $1,000 a week, the paying parent net income stays fixed down every row of the table below, but the other parent share of the combined total grows as their income rises from $2,000 to $6,000 a month. A larger other-parent income share does not shrink the payer obligation to zero. It shifts more of an already-larger combined obligation onto the other parent, while the payer own share of a bigger total can still move the dollar figure either way depending on how the combined obligation itself changes at each bracket.
- Weekly gross income
- $1,000 a weeksource
- Monthly gross equivalent
- $4,333.33 a month (weekly income x 52 / 12)source
- Split method
- Proportional to each parent share of combined net income, not a flat ratesource
- Where the table stops
- Rows where the other parent reports no income fall outside the 2026 tablesource
How to read the table below
Every row uses the same $1,000-a-week gross pay for the paying parent. Watch how the number changes across the four other-parent-income rows for the same child count: that movement is the proportional split responding to a changing combined income, not a separate calculation each time.
The "no reported income" row is marked unavailable rather than guessed, because the published conversion table itself does not list a net-income figure for a $0 gross parent.
What this estimate includes
- The 2026 Gross to Net Income Conversion Table lookup for both parents
- The income shares schedule of basic obligations for 1, 2, or 3 children
- The proportional split of the combined obligation by each parent share of net income
What it leaves out
- An individualized net income calculation based on actual taxes and deductions
- Court-ordered support paid for children of other relationships
- Maintenance (spousal support), computed separately under 750 ILCS 5/504
Worth knowing
The proportional-share method is the core mechanic of every income shares state, not an Illinois-specific rule, but the exact standardized net-income inputs and the schedule of obligations are Illinois own published figures.
A parent can see this same proportional logic play out differently at other weekly incomes in this series; the split percentage itself depends only on each parent share of the combined net income, not on the dollar amount of either income alone.
Frequently asked questions
Does Illinois split child support 50/50 between the parents?
No. The basic obligation for the combined income and number of children is split in proportion to each parent share of that combined net income, not evenly. A parent earning a larger share of the combined total owes a larger share of the obligation.
Why does the number change across the other-parent-income rows in the table?
Each row changes the combined net income of both parents, which changes both the basic obligation looked up on the schedule and the payer proportional share of it. Two things move together, not just one, which is why the change is not a simple straight line.
If the other parent earns much more, does the payer obligation drop to zero?
No. The payer still owes their proportional share of the combined obligation as long as they have income and the schedule produces an obligation for that combined total. A higher other-parent income does not zero out the payer share under Illinois income shares support.
Why is the "no reported income" row unavailable?
The 2026 Gross to Net Income Conversion Table lists standardized net-income figures starting at a defined gross floor. A parent reporting $0 falls below what the published table covers, so this page shows that honestly rather than inventing a figure.
Does my actual tax situation change the result?
Not under the standard table used here. A parent can ask a court for an individualized net income calculation based on real taxes instead of the table, and the result can differ from the table figure.
Is the schedule of basic obligations itself proportional, or a lookup table?
It is a published lookup table, not a formula, indexed by combined net income and number of children. Only the split of that looked-up amount between the two parents is proportional; the base amount itself comes straight from the 2026 schedule.
About the numbers on this page
Every figure in the table above comes from running the real Illinois child support engine on this site, the same engine and data pack behind the full Illinois child support calculator. Nothing on this page is a separate estimate or a reimplementation of the math. See the sources below for the statutes and official worksheets behind the Illinois guideline.
Reviewed by SupportDecode Editorial Team Page content reviewed Sources Methodology Update log
Changelog: page first published as part of the child support by income series. Material changes are dated in the update log.