Michigan lesson 4 of 6
Get an EIN and open a bank account
Your EIN identifies the LLC to the IRS, to banks and to the Michigan Department of Treasury once you register with it separately.
Applying for the EIN
Apply for free directly on the IRS website once your Articles of Organization are approved. If the responsible party has a US social security number or ITIN, the number is issued immediately online; otherwise the application is filed on Form SS-4 by fax or post.
Registering with Michigan Treasury
Separately from the EIN, most LLCs register with the Michigan Department of Treasury through its Online New Business Registration process. This is where you register for sales tax licensing if you sell taxable goods, and for withholding tax if you have employees.
Opening the account
Take the certified Articles of Organization, the EIN confirmation letter, an operating agreement if you have one, and identification for signers and significant owners. Route all business income and expenses through this account, since mixing personal and business funds is one of the most common reasons courts disregard an LLC's liability protection.
Key takeaways
- The EIN is free and issued by the IRS.
- Treasury registration is separate from the EIN and needed for sales tax or withholding.
- Keep business and personal funds in separate accounts.
Official sources
Or let us file your Michigan LLC for you
Everything above is yours to use for free. If you would rather hand it over, we prepare and file the Articles of Organization (Form CSCL/CD-700), act as your registered agent, and track your ongoing deadlines.
Last reviewed: September 2026 - reviewed by Gullia Filing Legal & Formation Team