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You will not be required to obtain a new EIN if
-- An existing partnership converts to an LLC classified as a partnership.
So for federal tax purposes that will be the SAME partnership and you will use the same EIN.
You will continue to file form 1065 as before - but if the LLC's name is ***** ***** you will us ea new name on form 1065
mark the appropriate name change box on the form: Page 1, Line G, Box 3.
Similarly - when you file for California - you will use the same partnership tax return form - with new name - and Check the box in the header that name changed.
No other forms or documents are required.