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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.
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Additional IRS Publications
Letter of Intent to Participate in NYC's Business Tax e-File Program
2022 Letter of Intent
Software Developer’s Guide 
Now available on the State Exchange System
NYC-Specific Schemas 
Now available on the State Exchange System
Business Rules 
Download TY2022 Business Rules
Naming Conventions 
Download TY2022 Naming Conventions
Error Codes  
Download TY2022 Error Codes
Test Packages 
Now available on the State Exchange System
Other Links 
Business Tax Services 
Email Business Tax e-File (BTeF)