Illinois

Alimony & Spousal Support in Illinois

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

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How Long Does Alimony Last in Illinois? 2026 Duration Guide & Formula

Illinois alimony lasts 20%-100% of the marriage length using statutory multipliers. Marriages over 20 years may receive indefinite maintenance under 750 ILCS 5/504.

Antonio G. Jimenez, Esq.·16 min read

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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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