Important: This calculator provides general estimates only and does not constitute legal advice. It applies the statutory guideline formula and does not calculate add-on expenses such as child care, extracurricular, or extraordinary medical costs, and it does not account for multi-family adjustments, maintenance, or non-guideline income situations. Use of this calculator does not create an attorney-client relationship with Jonathan D. Steele or Beermann LLP. Results do not account for judicial discretion, tax implications, or case-specific factors. For advice regarding your specific situation, consult a licensed Illinois attorney.

Financial Inputs

Net Income Note: This calculator applies flat assumed tax rates (28% / 22%) to estimate net income. Illinois courts instead determine net income under 750 ILCS 5/504(b-3) and 750 ILCS 5/505(a)(3), using either actual tax amounts or the standardized tax amount tables, so your court-calculated figure may differ substantially from the estimate shown here. For precise "Standardized Tax Amount" calculations required by court, consult an attorney.

Estimated Annual Support

Maintenance (Alimony)

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Monthly Payment

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Income Shift Visualization

How Illinois Maintenance is Calculated in 2026

Under 750 ILCS 5/504(b-1)(1), Illinois applies a guideline maintenance formula when the parties' combined gross annual income is less than $500,000 and the payor has no obligation to pay child support or maintenance from a prior relationship.

The Formula: Maintenance is calculated as 33.3% of the payer's net income minus 25% of the receiver's net income.
The Cap: Under 750 ILCS 5/504(b-1)(1)(A), the guideline maintenance amount, when added to the recipient's net income, may not result in the recipient receiving more than 40% of the parties' combined net income.
Duration: The length of payments is determined by multiplying the length of the marriage by a statutory multiplier that increases with the length of the marriage (from .20 for marriages under 5 years up to .80 for marriages of 19 to 20 years); for marriages of 20 years or more, the court may order maintenance for a period equal to the length of the marriage or for an indefinite term.

High Net Worth Exception

Where the parties' combined gross annual income is $500,000 or more, the guideline formula does not apply, and the court determines whether to award maintenance — and in what amount and for how long — based on the statutory factors in 750 ILCS 5/504(a). Jonathan D. Steele helps clients argue for deviations based on lifestyle, asset division, and future earning capacity.

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