“It's slightly complicated. I registered MN corp (S) and received the EIN #. Then moved to CA couple of years later & re-registered a new corp with the same name & received new EIN # and State ID. “====>According to the IRS, an EIN can only be used by the business it was originally assigned to. However, as you operate multiple businesses, you can use the same EIN. The IRS defines multiple businesses as "stores, plants, enterprises or branches of the entity. Your state , CA, or city may also require you to obtain a new EIN if you change your business name or location; so you need to check with your local laws and regulations before using an EIN for another business name, address, or type. For example, while the IRS does not require a Single Member Limited Liability Company to get an EIN, some states require that all businesses get an EIN regardless of the number of business owners.
“Due to some confusion i kept using the old MN EIN # & new CA STATE ID for the last 4 years. Now accidentally i noticed the error but i do not want to let go the old MN EIN# because of the goodwill & credit history associated with that for the last 4 years. So at any cost i would like to retain the old MN EIN#. What options do i have?”====>Eve n though an EIN (just like your personal SSN) is not transferrable. HOWEVER,as your business was a separate entity from yourself (that is, an LLC or C- or S-Corp) rather than a sole proprietorship, then it might be possible for you use that old entity for carrying on the business; this would allow you to keep the same EIN if that is a concern. You can use the same EIN EVEN if you change the name of your business. In the eyes of the IRS, the entity is the same even though the business name has changed. You also don't need an EIN if you change the location of your business(you did not even change your biz name in your case though). For example, if you own Joe's Florist on Main Street, then change your name to J.J's Floral Creations and relocate to Park Street, you do not need a new EIN and can use the same EIN for both businesses. I mean you don't need a new EIN to open a new branch of your business, but you will need one if you incorporate. These actions change the structure of the business entity and IRS regulations dictate that each business entity needs a separate EIN.But in this case, yu can still use old EIN. Please ask the IRS to search for your EIN by calling the Business & Specialty Tax Line at (800) 829-4933.