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All Matters of Accounting and Taxation

Federal Due Dates


March 16 Category: Partnership and S-Corporations

S Corp: File Form 1120S for calendar year & pay any tax due. Furnish copy Sch. K-1 or K-3 to each shareholder. For automatic 6-month extension, file Form 7004 & deposit estimated tax. File Form 2553 to elect S Corp status beginning with calendar year 2026.

S Corp election: File Form 2553 to elect to be treated as an S corporation beginning with calendar year 2026. If Form 2553 is filed late, treatment will begin with calendar year 2027.

Partnerships: File Form 1065 for calendar year and furnish a copy of Sch. K-1 or K-3 to each partner. For automatic 6-month extension, file Form 7004.


April 15  Category: Personal Income Tax
Mail or pay electronically 2025 income tax due.

Mail or pay electronically 2026 Quarter 1 estimated tax payment due.


June 15  Category: Personal Income Tax

Mail or pay electronically 2026 Quarter 2 estimated tax payment due.

​September 15 Category: Personal Income Tax
Mail or pay electronically 2026 Quarter 3 estimated tax payment due.


January 15 Category: Personal Income Tax
Mail or pay electronically 2026 Quarter 4 estimated tax payment due.


October 15 Category: Personal Income Tax
File Form 1040 if you timely requested a 6-month extension


Other Federal due dates:  All categories:


 


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