Due Dates for Filing Small Business Taxes
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Due dates for corporate tax returns
Corporate income tax and net worth tax returns (Form 600S) are due on or before the 15th day of the 3rd month.
Corporate income and net worth tax returns (Form 600) must be filed on or before the 15th day of the 4th month.
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Due dates for partnership returns
Partnership returns are due on or before the 15th day of the 3rd month following the close of the taxable year.