Michigan Workers' Compensation Insurance: What Employers Need to Know

Why Michigan Requires a Workers' Compensation Roster

Michigan law mandates that every employer maintain a workers' compensation roster that lists all covered employees and the insurance policy that protects them. The roster must be updated within 30 days of hiring or policy changes, and a copy must be made available to the Michigan Department of Labor & Economic Opportunity (LEO) upon request. Failure to keep an accurate roster can trigger penalties, audit notices, or even loss of coverage.

Key Elements of a Michigan Roster

• Employee name, address, and job title
• Effective date of coverage
• Insurance carrier and policy number
• Premium payment dates and amounts
• Any changes in employment status or job duties

Employers often overlook the need to update the roster after a worker's promotion or a temporary assignment. The roster must reflect the actual work performed, not just the employee's official title.

Comparing Michigan to Other States

Unlike states such as Ohio, which allow employers to submit a single annual roster, Michigan requires quarterly updates for any changes. Additionally, Michigan's roster must be available electronically in a searchable format, whereas some states accept paper copies. Employers who operate in multiple states should keep separate rosters for each jurisdiction to avoid compliance gaps.

How to Build a Robust Roster

Start with a master spreadsheet that captures all required fields. Use drop‑down menus for job categories and insurance carriers to minimize errors. Once the roster is populated, generate a PDF version for backup and a CSV for LEO submission. Automate reminders to update the roster when a new employee joins, leaves, or changes roles.

Common Mistakes to Avoid

• Assuming the initial roster remains static
• Failing to verify policy numbers against insurer records
• Ignoring temporary or seasonal workers who may be exempt from coverage but still need to be documented

When to Consult a Specialist

If your business has more than 25 employees, a sudden change in payroll, or is expanding into new locations, it is prudent to review the roster with a workers' compensation consultant. A specialist can help audit your records, ensure alignment with LEO requirements, and recommend software solutions that integrate with your HR system.