Answers · S corporations
When Is Form 1120-S Due?
A calendar-year S corporation generally files Form 1120-S by March 15; Form 7004 generally extends the filing deadline.
How it works
The rule, and what it turns on.
Late filing can trigger a per-shareholder, per-month penalty under IRC §6699 even if no entity income tax is due.
Example
A two-shareholder S corporation waiting on records should file Form 7004 on time rather than miss the deadline.
Common mistakes
What we see go wrong, and what we do instead.
- Assuming no tax due means no penalty.
A better approach
- Extend early if bookkeeping cannot be completed by the original due date.
Authority
Where this comes from, so you can check it.
IRC §§6072(b), 6081, 6699; Form 7004 instructions.
Relevant case law
United States v. Boyle, 469 U.S. 241 (1985) - reliance on an agent generally does not establish reasonable cause for
missing a known filing deadline.
Educational information, not individualized tax advice. Treatment depends on your facts, entity classification and tax year, and IRS instructions change. Confirm your own position with us before relying on it. Mint Associates does not provide legal services.
Also asked
The same question, the other ways people put it.
- What Happens if Form 1120-S Is Filed Late?
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