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Scenario: an existing LLC, taxed as a sole proprietorship or a partnership, has an employer ID number. If the LLC later decides to be taxed as a corporation, does it need a new EIN?

This one is straightforward to answer. The answer is, no.

Here’s what the IRS says (look at the 4th bullet point):

You will not be required to obtain a new EIN if any of the following statements are true.

  • You report income tax as a branch or division of a corporation or other entity, and the LLC has no employees or excise tax liability.
  • An existing partnership converts to an LLC classified as a partnership.
  • The LLC name or location changes.
  • An LLC that already has an EIN chooses to be taxed as a corporation or as an S corporation.
  • A new LLC with one owner (single member LLC) is formed under state law, does not choose to be taxed as a corporation or S corporation, and has no employees or excise tax liability. NOTE: You may request an EIN for banking or state tax purposes, but an EIN is not required for federal tax purposes.

From the IRS webpage “Do You Need a New EIN?”

“This blog post, along with comments that may follow, should not be considered tax advice. Before you make final tax or financial decisions, please secure a professional tax advisor to give you advice about your unique situation. To secure Jason as your accountant, please click on the ‘Services’ link at the top of the page.”