Contact Us

• Tax Contacts
• Hours of Service and Phone Contacts
• Report UI Fraud
• File an Appeal
• Submit Law Change Suggestions

Information

• Special Assessment for Interest FAQ
• FUTA Credit Reduction Notice
• Respond Electronically to UCB-16 Notices

Resources

• Handbook for Employers
• Tax Questions
• UI Forms
• UI Publications
• Legal Resources

UI Employer Service Provider (ESP) Resources

Online Services

• Employer Service Provider Online Services includes access to the on-line tax and wage reporting system and the wage report validation test environment.
• New Employer Registration (apply for a new UI account number)
• About Registering a Business

File Tax and Wage Reports

• About Tax Reporting
• Tax Report File Layout
• Tax Report Error Messages

• About Wage Reporting
• Wage Report File Layout
• Wage Report Error Messages

Client Tax Rates and Data File Exchange

• Request Client Tax Rates
• About Data File Exchange
• Download Data File Exchange Template

Definition of an Employer Service Provider (ESP)

An Employer Service Provider (ESP) or employer agent is any third party who prepares the quarterly contribution tax and/or wage report on behalf of an employer who is subject to Wisconsin's Unemployment Insurance (UI) law.

Employer Service Provider Requirement

All ESPs preparing reports for employers must file employer tax and wage reports using an electronic medium and format approved by the Department of Workforce Development (DWD). Tax and wage reports may be filed electronically only if an employer has a UI account number.