Tools
Corporate deadline calculator
Find the federal due date for a corporate return, including weekends and holidays in the rule.
MM-DD, for example 12-31
Due date
2027-03-15
How this was calculated
- 1515th day of the 3rd month after the fiscal year end (12-31)
Verified ruleForm 1120-S · 2026
SourceThis is an estimate, not advice or a filed position.