Contact Us

• Tax Contacts
• Hours of Service and Phone Contacts
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• Report Suspected Misclassified Workers
• File an Appeal
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Information

• UI Financing/Tax Rate
• Respond Electronically to UI Forms (SIDES)
• FUTA Credit Reduction Notice
• Special Assessment for Interest
• Plain Language Summary of Law Changes

Resources

• Handbook for Employers
• Tax Questions
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UI Employer Service Provider (ESP) Resources

Online Services

• Employer Service Provider Online Services includes access to the online 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.