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No-Programming Option for Employers

e-IWO Software Interface Specifications
July 3, 2012

Provides e-IWO specifications and an electronic version of the IWO for the employer no-programming option

System-to-System Interface Option for States and Employers

e-IWO Software Interface Specification
June 6, 2018

Provides a processing overview and technical specifications for the electronic transmission of income withholding information