The tax advantages are that you can use llc. Most major corporations use this. On a large purchases and orders you may be exempt? Are you a sub s corporation? If so there are other tax exemptions you can be made aware of. And you can find out more on the web.
The tax benefit of being a Sub S corporation is that you retain the same "pass through" benefits as a partnership. Thus, each share holder is responsible for his or her own taxes. There is no double taxation as with a C corporation.