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How Late Can You File Back Taxes — and What Are the Penalties?

How late can you file back taxes and what are the penalties? A guide for taxpayers in St. Louis

Updated September 24, 2026 Quick Summary: Falling behind on tax filings happens more often than you might think. Whether caused by a major life disruption, sudden illness, missing 1099/W-2 records, or simply panic over owing money you couldn’t afford to pay, putting off tax returns creates mounting stress. Many St. Louis taxpayers mistakenly believe that […]