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Alimony & Spousal Support in Illinois

Types of alimony, duration, modification, tax implications, and how courts determine amounts.

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Alimony Calculator: Estimating Spousal Support in Illinois (2026 Guide)

Use our Illinois alimony calculator guide to estimate spousal maintenance. Illinois uses a 33.33%-minus-25% net income formula with a 40% cap for incomes under $500K.

Antonio G. Jimenez, Esq.·15 min read

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