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Completed by employers or third party processors to register to use Employer Services Portal applications

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

Guidance on what can and cannot be changed on the standard OMB-approved IWO form

The flowchart shows how the Income Withholding for Support form is processed by employers and child support agencies

Announces the expiration date of October 31, 2022 for federally approved of the National Medical Support Notice Part A and B

Explains actions private employers and federal agencies must take when an employee is terminated or rehired

For state agency staff, this explains some differences between independent contractors and employees

Provides contact information for the multistate employers

Provides states and tribes with Department of Labor Opinion Letter regarding withholding limits for lump sum payments

Map shows states and territories using lump sum reporting and electronic terminations, also called eTerm