Sales tax exemption certificates only allow certificate holders to make purchases without paying sales tax. They do not make them exempt them from other taxes, according to the New York State Department of Taxation and Finance.
The U.S. Department of State issues several types of sales tax exemption cards to diplomats, explains the agency's website. Mission tax exemption cards allow the diplomat to purchase goods essential to the mission tax free, and he can purchase personal items without tax with a personal tax exemption card. Cards have varying levels of tax exemption, and not all personnel receive tax exemption cards.