Hidden Income and Imputed Income in Illinois

What is imputed income?

Illinois courts have the authority to impute income to a parent who is voluntarily unemployed or voluntarily underemployed. Imputed income is the income the court determines the parent could earn if they were working to their full capacity — not what they actually earn.

Imputed income is used in both child support calculations (750 ILCS 5/505) and maintenance calculations (750 ILCS 5/504). The purpose is to prevent a parent from reducing their child support or maintenance obligation by artificially lowering their income.

Voluntary unemployment or underemployment

A parent cannot simply quit their job, reduce their hours, or take a lower-paying position to reduce their support obligation. Illinois courts look at whether the change in income was voluntary and, if so, what the parent could earn.

When determining what income to impute, courts consider:

• The parent's work history and prior earnings
• Their education, training, and professional licenses
• Their skills and experience
• Local job market conditions and available opportunities
• The parent's physical and mental health
• Childcare responsibilities (a parent who is the primary caregiver for young children may have a legitimate reason for reduced work hours)

If the court finds a parent is voluntarily unemployed, it typically imputes at least full-time minimum wage as a floor, or more if the parent's skills and background support a higher wage.

Self-employed parents

Self-employment creates significant opportunity for income manipulation. A self-employed parent controls what business expenses they deduct, what revenue they report, and how they structure their compensation. Illinois courts look beyond the tax return to the economic reality of the business.

Courts examining self-employment income review:

• Schedule C (sole proprietorship) or K-1 (partnership or S-corp)
• Business bank statements for all accounts
• Client lists and invoices (to determine actual revenue vs. reported revenue)
• Credit card statements showing business expenses

A common issue is business expenses that reduce taxable income but reflect actual economic benefit to the parent rather than true business necessity. Examples include: personal use of a business vehicle, meals and entertainment deductions, home office deductions, and personal travel disguised as business travel. Courts “add back” non-necessary expenses to calculate the parent's true available income.

Cash income and unreported income

Some parents receive income in cash or through informal channels that does not appear on their tax returns. Illinois courts use a lifestyle analysis to identify unreported income: if a parent's spending significantly exceeds their reported income, the court asks how they support that lifestyle.

Evidence courts consider in a lifestyle analysis:

• Bank statements showing unexplained deposits that exceed reported income
• Mortgage or rent payments, car payments, or other fixed expenses that cannot be supported on reported income
• Business revenue without corresponding expenses (suggesting cash was skimmed off the top)
• Venmo, PayPal, Cash App, and Zelle records showing regular payments received

Documenting hidden income

If you believe the other parent is hiding income, gather the following evidence before your hearing:

• Tax returns — at least three years of federal and state returns (all pages, all schedules). You can request these from the IRS directly using Form 4506-T if the other parent will not produce them.
• All bank accounts — personal and business checking, savings, and investment accounts for at least the last 12–24 months.
• Mobile payment records — PayPal, Venmo, Cash App, and Zelle transaction histories. These are increasingly the source of undisclosed income for gig workers and self-employed parents.
• Social media — screenshots of posts showing purchases, vacations, or lifestyle expenses inconsistent with the claimed income level. Save these promptly — social media can be deleted.
• Prior court filings — if the other parent previously reported higher income in another court proceeding, those filings can be introduced to show the inconsistency.