: Previously used for certain tax payments, these are no longer supported for paper processing as of recent tax years.
: Used by corporations to report changes to unrelated business income or claim overpayments. Key Publications and Guidelines nys-dtf-ct
: The Corporation Tax Modernized E-File Handbook , which details the technical requirements for filing and recent changes for the 2025 tax year. : Previously used for certain tax payments, these
The most "interesting" aspect for filers currently is the . Primary Corporation Tax Forms nys-dtf-ct