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 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. : Most corporation tax extensions and estimated tax

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

: Previously used for certain tax payments, these are no longer supported for paper processing as of recent tax years.

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

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