https://isthisbs.org/legal/an-s-corporation-has-an-april-15-federal-income-tax-return-1117239a/IsThisBSen2026-09-02T15:18:22.586200+00:00Calendar-year S corporations generally file federal returns by March 15.https://isthisbs.org/legal/a-calendar-year-c-corporation-can-obtain-an-automatic-six-to-4363bd0c/IsThisBSen2026-09-02T15:18:00.012984+00:00Timely, properly completed Form 7004 grants calendar-year C corporations six months.https://isthisbs.org/finance/an-s-corporation-files-its-federal-income-tax-return-on-form-b43827ec/IsThisBSen2026-09-02T15:17:54.232464+00:00An S corporation generally files Form 1120-S for its federal return.https://isthisbs.org/legal/a-calendar-year-c-corporation-s-federal-income-tax-return-is-21f5700d/IsThisBSen2026-09-02T15:17:06.752879+00:00Calendar-year C corporation returns are ordinarily due on April 15.https://isthisbs.org/legal/a-calendar-year-c-corporation-files-its-federal-income-tax-c6e09d70/IsThisBSen2026-09-02T15:16:48.371338+00:00Domestic calendar-year C corporations generally file federal returns on Form 1120.https://isthisbs.org/science/climate-change-is-not-real-729d6d29/IsThisBSen2026-09-01T09:04:25.428413+00:00Modern climate change is real, measurable, and primarily human-caused.