You May Need The Following:  

1.  All businesses need a business registration number also called a business license.
2. All businesses that want to buy wholesale ( i.e., buy without paying taxes), or sell retail and collect taxes,  need a Resale License / State Sales Tax Id Number also called a seller's permit or resale tax id number.
3. All businesses that have employees, need a federal tax ID number EIN ( also called an IRS number) and a state employer tax ID number State EIN.
4. All businesses are advised to get a federal tax id number and use it as a business ID number.  Note that a federal tax ID number is also an employer number as well as a business ID number.
5. All corporations, partnerships, and llcs, are required to get a federal number to use as a business tax ID ( though, even sole owner can use it as a business ID number).