If a limited liability company lists a “C” or “S” as the tax classification on their W-9 form, they are considered a corporation for 1099-MISC and 1099-NEC purposes by the IRS. The “C” code means that the IRS approved their Form 8832 application to be taxed as a C corporation. The “S” code means that the IRS approved their Form 2553 application to be taxed as an S corporation. In both instances, the LLC entity is still a limited liability company but the IRS treats the LLC as a corporation for tax purposes. Therefore, any exemption in the 1099-MISC and 1099-NEC instructions applies to an LLC that has made either one of these elections.
For more information see the Instructions for Forms 1099-MISC and 1099-NEC.