The Delaware tax return is due on or before April 15 each year. For business taxpayers, the return is due on or before the 15th day of the fourth month after the fiscal year ends. Returns postmarked after the due date are subject to a late filing penalty. Penalty information appears below. If the due date should fall on a weekend or holiday, the due date will move to the next business day.
Forms are here, and at the tax office in City Hall, 1 S. Sandusky Street.
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