You will need a new EIN if any of the following are true
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You are a subsidiary of a corporation and currently use the parent's corporate EIN
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You become a subsidiary of a corporation
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The corporation becomes a partnership of a sole proprietorship (It varies on each state)
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You create a new corporation after a statutory merger
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You receive a new corporate charter
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The EIN will not be changed if you have changed the existing name of the company.
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Changing a company structure such as corporation to an llc or vice versa
