When you decide to apply with the IRS for your employer identification number, more commonly known as EIN, you have choices on how to do so. One way is to use a professional company specializing in EIN applications. Before you do so, you want to make sure there are no restrictions that might impact your successful application. What Entities Can File? The first place to look for restrictions is the type of entities that can apply for an EIN through the process. The best are companies that provide EIN filing