Keith, 

I think you may be talking about an EIN number.  A tax exempt number is a number assigned by a state agency to identify the entity or organization as exempt from state sales taxes. Tax exempt organizations may include churches, public charities, private foundations, social welfare groups, trade associations, social clubs, fraternities, employee benefit funds, veteran and political organizations, etc..  An EIN number is a federal tax identification number issued by the IRS and is used to identify businesses and other entities operating in the United States. Generally, an EIN number is used to file various IRS business tax returns, open business bank accounts, obtain business licenses, etc.. If your farm fresh eggs is a business for you then you may want to consider getting an EIN number.  If you have further questions, you can always reach out to the product center who will be able to answer more of your questions.  

MSU Extension Product Center - productcenter.msu.edu

Kellie Jordan

Food Safety Instructor - Think Food Safety

Pronouns: she/her/hers

Michigan State University Extension

Calhoun County Extension Office

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Brian, 

That is something different, I did find this article about the farm tax exempt that may be helpful.  If you still have more questions I can refer you to someone in MSU Agricultural department.   https://www.canr.msu.edu/news/michigan_sales_tax_and_farm_exemption_1