Illinois officials warn taxpayers to mail returns early as USPS postmark updates may affect 2026 processing deadlines.
ILLINOIS (WCIA) — The Illinois Department of Revenue (IDOR) said changes announced by the United States Postal Service (USPS) ...
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Illinois taxpayers urged to mail returns early due to USPS changes
The Illinois Department of Revenue is warning taxpayers that recent changes to the way the U.S. Postal Service uses postmarks could affect their filings this year, and is encouraging them to mail ...
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