Which financial materials apply to a 2026 Illinois child support calculation?
HFS says its updated income-shares amounts took effect March 20, 2026. The 2026 Schedule of Basic Child Support Obligations uses combined monthly net income and the number of children to identify the basic obligation. The standardized gross-to-net table serves a different purpose: it assists in converting income using the prescribed tax assumptions. A paycheck's deposit amount is not automatically the adjusted net income required for the support calculation.
Confirm the relevant calculation period before using these materials. An earlier period may require historical materials. When comparing an estimate with an existing order, preserve the worksheet that produced the old amount so differences in income, taxes, child count and other inputs can be identified rather than attributed entirely to a new table. HFS current materials and effective-date notice.
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Explore this topicThe 2026 shared-care illustration still uses 146 overnights
Under the shared-care rule applicable to the 2026 framework, each parent must exercise at least 146 overnights per year for that guideline calculation. The basic obligation is multiplied by 1.5. Each parent's income share is then multiplied by the portion of time with the other parent, and the two calculated obligations are offset. The official HFS shared-care worksheet shows the sequence.
This is not a rule that equal parenting time always produces zero support. Different incomes can produce a transfer even with a closely balanced schedule. It also does not answer how a disputed parenting calendar, split care, benefits, low-income provisions or additional expenses should be treated. Our child-support service guide explains the broader review.
What Illinois child support changes begin in 2027?
Public Act 104-0733 introduces a shared-care framework beginning January 1, 2027. It refers to each parent exercising 110 or more overnights, or qualifying overnight equivalents determined by a court as a deviation from guidelines or by agreement. Overnight equivalents concern significant periods of direct care on separate days when the child does not stay overnight. An ordinary calendar entry does not automatically establish a legally accepted equivalent.
The future framework retains the 1.5 multiplier but includes percentage adjustments when a parent's shared care falls below 146 overnights or equivalents. Those adjustments range from 10% for 110 through 114 to 2% for 140 through 145, with intermediate bands and a basic-guideline ceiling. HFS is directed to provide calculation worksheets. This is more than changing 146 to 110 in an old calculator. The official enactment record confirms the January 1, 2027 effective date.
What the website calculator can and cannot do
The local child-support illustration uses the March 20 through December 31, 2026 materials. It requires verified adjusted net incomes, an actual basic obligation copied from the HFS schedule and confirmation that special minimum-support provisions do not apply. It does not automatically verify the copied schedule amount or determine legal income from gross pay.
The tool stops for selected special circumstances, unresolved minimum-support questions, income outside the published schedule and 2027 calculations. It shows certain expense shares separately rather than assuming who paid an expense or adding every cost to the transfer. Its arithmetic can help prepare questions; it is not an HFS determination or a court order. The HFS 2026 addendum explains the schedule's background and range.
A different estimate is a reason to review the order
Do not reduce, increase or stop an ordered payment merely because a calculator or news article produces a different number. Section 510 governs modification and includes requirements affecting grounds, notice and the installments that may be changed. The applicable route must be assessed against the actual order and circumstances.
For a useful comparison, separate three questions: Did the family's verified financial information change? Did parenting time or an expense arrangement change? Is a new legal rule applicable to the requested period? An answer to one does not automatically resolve the others. Where an existing order is not being followed, our order-enforcement guide covers a different problem from recalculating future support.
Prepare a support review that addresses the real disagreement
- Bring the signed support order and any later modification, parenting allocation and expense orders.
- Organize recent income documents and identify bonuses, business income, unemployment, benefits or inconsistent earnings that need attention.
- Use one parenting calendar and identify disputed entries. Explain whether every child follows the same schedule.
- Collect child-care, insurance and other relevant expense records, showing who paid and whether reimbursement occurred.
- Keep the HFS worksheet or schedule row used in each estimate and identify the period being calculated.
These materials let a consultation focus on the source of the difference and the available process. Read our guide to seeking support in Illinois for the broader starting steps, or schedule a consultation about representation. This article does not predict a particular payment, reduction or case outcome.
