Nys-dtf-ct

: Used by corporations to report changes to unrelated business income or claim overpayments. Key Publications and Guidelines

: For forms that still allow manual entry, the NYS DTF website provides enhanced fill-in versions that automate basic math to reduce errors.

: 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

If you are looking for a deep dive (a "paper") on how these taxes work, these official handbooks are the best resources:

: 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

The most "interesting" aspect for filers currently is the . Primary Corporation Tax Forms

: This is the standard return for most general business corporations in New York. If you are looking for a deep dive

: Provides specific procedures for e-filers and software developers participating in the NYSDTF program. Important Filing Note