NACHA State Tax Change Portal

XML Tax Standards [see statemef.com]

2-D Bar Code Standards Including Vendor ID Codes - 2010 Final 
updated October 31, 2010
[more on 2-d bar code standards]

Electronic Funds Transfer (EFT) [TXP Format]
Tax Type Codes and Amount Type Codes
Third Party Payment Banking Convention (TPP) - Format and Explanation [November 21, 2012] 

Wireless Communications Sourcing Standards

Standards Development

Fed-State E-File Modernization - StateMeF.com

For additional information, contact Jonathan Lyon