US Tax Shield, as a service provider, typically offers assistance in dealing with tax-related issues, including negotiations with the IRS. However, it is important to understand that they generally act as representatives, providing guidance and support throughout the negotiation process. The actual negotiation would typically be carried out by a tax professional or attorney associated with US Tax Shield, who would take the necessary steps to advocate on behalf of the client. While US Tax Shield may handle much of the correspondence and paperwork, clients are usually kept informed and involved in decisions. It is best to refer to the official website for specific details on the services provided and how they handle client representation in negotiations with the IRS.