Yes, if the merger is correctly done, you can keep your EIN. Please have a good tax and business lawyer do this because it is more complex than you think!
If you do not like this answer or disagree, please look at one of the other answers provided. It is not necessary for you to try prove this answer is "wrong" or something with which you do not agree. This is a free service for you based on limited facts. Nevertheless, many times you need to consult an attorney with the details to get actual advice specific to your concerns. Do not put too many details in your questions or comments because this makes the information public and could hurt you. Government Regulations contained in IRS Circular 230 regulate written communications about Federal tax matters, including e-mail, between us and our clients. This is another attempt by the government to limit your rights and to extend the control of government over individuals and businesses. Nevertheless, such communications are either opinions or other written communications. This is not an opinion. It is other written communication and was not written to be relied upon, by itself, to avoid any tax penalties. In order to receive assurances of protection from tax penalties from a written communication, you should get an opinion letter. If you would like to discuss an opinion letter relating to any matter, please contact me and I will explain what is involved and what it will cost.
According to the IRS web site: "Generally, businesses need a new EIN when their ownership or structure has changed." But it may also depend upon the how one or both of the LLCs are taxed under federal income tax law. There are three possibilities: sole proprietorship (or corporate division), corporation (including S corp), or partnership. Whether you need a new EIN may depend partly on the type of tax status of the OR and/or WA entities.
Mr. Cappuccio's answer may be correct and he is certainly correct that it's time find that business/tax lawyer! Make sure the lawyer does business taxation, as opposed to some other area like estate/gift or state and local tax.
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