"The multilateral nuclear accord (Joint Comprehensive Plan of Action, or JCPOA) provides Iran broad relief from U.S., U.N., and multilateral sanctions on Iran's civilian economic sectors. On January 16, 2016, upon the International Atomic Energy Agency (IAEA) certification that Iran had complied with the stipulated nuclear dismantlement commitments, U.S. Administration waivers of relevant sanctions laws took effect, relevant Executive Orders (E.O.s) were revoked, and corresponding U.N. and EU sanctions were lifted ('Implementation Day'). Remaining in place have been those secondary sanctions (sanctions on foreign firms) that have been imposed because of Iran's support for terrorism, its human rights abuses, its interference in specified countries in the region, and its missile and advanced conventional weapons programs, as well as sanctions on the Islamic Revolutionary Guard Corps (IRGC) and designated commanders, subunits, and affiliates. A general ban on U.S. trade with and investment in Iran, including regulations barring transactions between U.S. and Iranian banks, remains in place. Under U.N. Security Council Resolution 2231, most U.N. sanctions terminated as of Implementation Day, but some U.N. restrictions on Iran's development of nuclear-capable ballistic missiles and its importation or exportation of arms remain in place for several years."
CRS Report for Congress, RS20871
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html