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.

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

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