
Amending a Return or Filing Prior-Year Returns: Form 1040-X, Refund Deadlines and Catch-Up Filing (2026)
Fix a filed return with Form 1040-X (recent years can be e-filed). Refund claims must be filed within 3 years of filing or 2 years of payment; an unfiled 2023 return's refund expires April 15, 2027. North Carolina amendments are due within 6 months.
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