Closing Date Prorations Calculator Guide for Illinois

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Published December 20, 2025 • Updated May 14, 2026 • By DocketMath Team

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This article is for informational purposes only and does not constitute legal advice. Laws change frequently — verify all citations with current official sources.

How the limitation period applies

The controlling primary authority for Illinois closing cost calculations and prorations for real estate transactions; property tax proration basis under 35 ILCS 200/21-15 is 35 ILCS 200/21-15.

35 ILCS 200/21-15. The last ascertainable tax bill shall be the basis for determining the amount of taxes to be prorated.

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DocketMath's statute-of-limitations tool can model these timelines once you identify the controlling claim type and accrual date. Use the source panel for the verified primary-source citations.

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Sources

35 ILCS 200/21-15 — Property tax proration basis

All sources are official primary law published by www.ilga.gov.

Corroboration method: government_primary_source_direct_fetch.

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