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Once an EIN has been assigned to a business entity, it becomes the permanent Federal taxpayer identification number for that entity. Regardless of whether the EIN is ever used to file Federal tax returns, the EIN is never reused or reassigned to another business entity. The EIN will still belong to the business entity and can be used at a later date, should the need arise.
If you have lost or misplaced your CP 545 that was sent when you first applied you can ask the IRS to search for your EIN by calling the Business & Specialty Tax Line at(###) ###-#### The hours of operation are 7:00 a.m. - 7:00 p.m. local time, Monday through Friday. An assistor will ask you for identifying information and provide the number to you over the telephone and then send you a letter of verification.
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