: Used by corporations to report changes to unrelated business income or claim overpayments. Key Publications and Guidelines
: The Corporation Tax Modernized E-File Handbook , which details the technical requirements for filing and recent changes for the 2025 tax year. nys-dtf-ct
: This is the standard return for most general business corporations in New York. : Used by corporations to report changes to
If you are looking for a deep dive (a "paper") on how these taxes work, these official handbooks are the best resources: nys-dtf-ct
: Most corporation tax extensions and estimated tax payments must be filed electronically . Paper versions of these extensions (except Form CT-5.1) are generally no longer accepted for processing.
The most "interesting" aspect for filers currently is the . Primary Corporation Tax Forms
