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UI State Information Data Exchange System (SIDES)

Respond Electronically to UI Forms

SIDES and SIDES E-Response are web-based options developed through a partnership between the U.S. Department of Labor and state Unemployment Insurance (UI) agencies to simplify and streamline electronic responses to UI information requests. Online access to your Wisconsin UI Account is required to respond using SIDES.

Respond to UI Notices, View Benefit Determinations & File Benefit Appeals

TO REPLY ONLINE:  Log into UI Employer Online Services

    New to Using Online Services?

    1. Create a Logon ID
    2. Request Online Access to Your Account - Login and enter your 10-digit account number or FEIN. For security purposes, you will be mailed a letter providing your Access Key and information on access rights.
    3. Get Online UI Account Access - Login and click the link "Get Access to Your Account." Enter your Access Key (Step 4 from letter) to associate your Logon ID with your UI Account.

SIDES E-Response

How It Works

Employers and TPAs will receive a paper form by mail from Wisconsin's Unemployment Insurance Division. The paper form will include instructions about how to reply.

Employers may reply to the following forms online:

  • UCB-16 - Separation Notice
  • UCB-20 - Determination
  • UCF-350-4 - Weekly Earnings Audit
  • UCF-17275 - Weekly Earnings Audit
  • UCF-17275-3 - Weekly Earnings Audit SDNH

The website is accessible free of charge to any employer or third-party administrator (TPA) with Internet access.

SIDES E-Response provides a nationally-standardized format, in which employers and TPAs can easily respond to UI information requests, attach documentation for separation information, and receive a date-stamped confirmation of receipt.

Employers and TPAs that use SIDES E-Response are better able to anticipate and supply the data needed for UI information requests and in return, reduce follow-up phone calls and paper work, prevent improper payments, and streamline UI response processes, ultimately saving time and money. Given the sensitive data exchanged between state UI agencies and employers and TPAs, SIDES has multiple layers of security and uses secure communication protocols.


SIDES differs from SIDES E-Response in that it is an integrated computer-to-computer interface, not a website. SIDES is designed for employers and TPAs that typically deal with a large volume of UI information requests. SIDES is especially helpful to those employers and TPAs that operate in multiple states.

SIDES is available free of charge, although there will be internal IT system development costs to integrate with SIDES.

Additional information is available at