How Does Child Support Work When a Parent Is Self-Employed in Illinois?

 Posted on April 30, 2026 in Child Support

When one parent runs their own business, calculating child support in an Illinois divorce is rarely straightforward. There is no pay stub to hand over, and business expenses can make it hard to tell what a parent actually earns versus what they spend. The stakes are high — the support amount set by the court will shape your child's daily life for years. If you are sorting through this in 2026, a St. Charles, IL child support attorney can help you get to the truth of the numbers.

How Do Illinois Courts Calculate Child Support for Self-Employed Parents?

Illinois uses an income shares model to calculate child support. Under 750 ILCS 5/505, the court looks at both parents' net incomes to set a fair support amount. For a salaried parent, net income is easy to calculate. For a self-employed parent, the court has to dig deeper.

The court starts with the parent’s gross business income, then subtracts reasonable and necessary business expenses to estimate net income for child support purposes. But not every expense claimed on a tax return holds up in family court. Judges can look past deductions that seem to lower income on paper without reflecting the parent's real situation. Income the court may consider includes business profits, salary or draws from the business, rental income tied to business property, and perks paid through the business, such as a car or a phone.

What Happens When a Self-Employed Parent Underreports Income in an Illinois Divorce?

One of the biggest concerns in these cases is income hiding. A self-employed parent has more control over how income looks on paper than a W-2 employee does. A parent might delay invoicing clients, run personal expenses through the business, or report low income right before a divorce. Illinois courts are aware of this, and judges take a hard look when the numbers do not add up.

This is not uncommon. According to IRS research, Schedule C net income, the tax form most self-employed people use, makes up about 41 percent of the entire individual income tax underreporting gap in the United States. When that pattern shows up in a divorce case, it can directly affect how much child support a parent receives.

When the court suspects hidden income, it may impute income to that parent. This means the judge may assign income based on earning capacity, work history, education, and available evidence rather than relying only on what the parent reports. The court may also look at past tax returns, industry salary data, and the parent's lifestyle. A forensic accountant can help, too. This professional digs into financial records to find gaps, track cash flow, and give the court a clear picture of what the self-employed parent actually earns.

How to Request a Child Support Modification When a Self-Employed Parent's Income Changes

Self-employment income can shift a lot from year to year. Illinois law allows either parent to ask for a child support modification when there has been a substantial change in circumstances. In some cases, a large income change or a significant difference between the current order and guideline support may support modification.

If your business has slowed down and you are the paying parent, you will need solid proof of the income change. Courts are cautious when a self-employed parent claims a sudden drop right around a support dispute. If you are the receiving parent and you think the other parent is earning more, you can request updated financial records and ask the court to recalculate. Either way, clean and detailed records are your best tool.

Keep in mind that a modification is not automatic. You have to file a petition with the court and show evidence of the change. If the other parent disagrees, the matter may go before a judge. Having an attorney on your side during this process can make a real difference, especially when self-employment income is involved, and the other side disputes your numbers.

Contact a Kane County, IL Child Support Lawyer

Child support disputes involving self-employed parents need careful financial analysis and strong legal advocacy. The St. Charles, IL family law attorneys at Weiler & Associates, P.C. are ready to handle even the most complex income disputes. Attorney Tim Weiler is a Certified Financial Litigator. That means he has specialized training to litigate and settle the most complex financial issues in divorce, including cases involving business owners and self-employed parents. If you need to establish, enforce, or modify a child support order, call 630-331-9110 to speak with one of our attorneys today.