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Short answer
A calendar-year C corporation files Form 1120 by April 15 and pays estimated tax by April 15, June 15, September 15 and December 15 if it expects to owe $500 or more. S corporations and multi-member LLCs file by March 15. A foreign-owned single-member LLC files a pro forma Form 1120 with Form 5472 by April 15. Forms 1099-NEC and W-2 are due January 31.
How this tool works
Dates follow IRS rules and move to the next business day when they fall on a weekend or federal holiday. A June 30 year end keeps the old September 15 due date for tax years that began before 2026.
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Sources
Updated October 30, 2026. General information, not legal or tax advice.
Questions founders ask
No. S corporations cannot have nonresident alien shareholders.
No. Form 7004 gives more time to file. Tax is still due on the original date.
January 31. For payments made in 2026 and later, file for each U.S. contractor paid $2,000 or more (it was $600).
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