Note:
Internal Revenue Manual Part 3. Submission Processing · 2026-10-03 edition · updated 2026-10-04 · United States
Form 1065 filers with a tax year beginning before January 1, 2016 were granted an 5 month extension with upon receipt of a timely filed Form 7004 extension request.
Period Ending
Return Due Date
Extended Due Date
Jan. 31
5-15
10-15
Feb. 28
6-15
11-15
Mar. 31
7-15
12-15
Apr. 30
8-15
1-15
May 31
9-15
2-15
June 30
10-15
3-15
July 30
11-15
4-15
Aug. 31
12-15
5-15
Sept. 30
1-15
6-15
Oct. 31
2-15
7-15
Nov. 30
3-15
8-15
Dec. 31
4-15
9-15
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