All participants in the NYC program must comply with the procedures, requirements, and specifications as detailed in IRS Publication 3112: IRS e-File Application and Participation and IRS Publication 4164: Modernized e-File Guide for Software Developers and Transmitters.
Read More
Additional IRS Publications
Letter of Intent to Participate in NYC's Business Tax e-File Program
2019 Letter of Intent
Software Developer’s Guide
Download TY2019 Guide
NYC-Specific Schemas
Now available on the State Exchange System
Business Rules
Download TY2019 Business Rules
Error Codes
Download TY2019 Error Codes
Test Packages
Now Available on the State Exchange System
Other Links
Business Tax Services
Email Business Tax e-File (BTeF)