UI Employer Service Provider (ESP) Resources
- 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
Client Tax Rates and Data File Exchange
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.