State C‑Corp & S‑Corp Deadline Comparisons: What You Must Know for 2025–26 Filing Seasons

While federal deadlines for C‑Corporations (Form 1120) and S‑Corporations (Form 1120‑S) are well‑known—April 15 and March 15 respectively—each state sets its own due dates and extension rules. Failure to align state filings with federal timelines can result in penalties, interest, and lost extension privileges....

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