There are several identification numbers which can apply to a business. In general, there are no restrictions placed on anyone obtaining these numbers. Most citizens who are eligible to vote are likely to be eligible to register for a corporation ID, tax ID or an unemployment insurance ID.
There are several different forms of business identification numbers. The most widely known and used is the Employer Tax Identification Number. This is a number which permits a business to collect Sales Tax on behalf of a state. In addition, some states require that businesses register to pay a franchise tax or corporation tax, and there is a separate identification associated with that tax. A third number is associated with the business's unemployment insurance.