Nys-dtf-ct -

: 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

: 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. : For forms that still allow manual entry,

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

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