W-9 Tax Form: Do I need to provide if I am a corporation?

I work as a contractor to a client and receive my compensation, payable to my corporation, not myself. Do I need to provide my client with a W-9 form stating that I am a corporation and exempt from backup withholding? Or, is that for individuals only? And, if I do provide a W-9, does the corporation TIN need to be disclosed, since it will not be used for reporting a 1099 form.