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Last Updated: 12/18/2017

Due Dates

​You must file Form M8, S Corporation Return, and pay the tax owed by the due date for filing your federal return. Generally, this is March 15 of the following year or, if you file on a fiscal year basis, the 15th day of the third month following your tax year.

The filing date is the U.S. postmark date, or the date recorded or marked by a designated delivery service. Postage meter marks are not valid. When a return is considered late, the date it is received at the Department of Revenue is treated as the date filed.

When the due date falls on a weekend or legal holiday, returns and payments that are postmarked or electronically transmitted on the next business day are considered on time.