Side Agreement Law and Legal Definition

A side agreement is one that is ancillary to another agreement. In terms of International law, a side agreement refers to an international accord that is specifically negotiated to supplement a broader trade treaty. For example, NAFTA contains no provisions about labor standards or environmental protection. However, two side agreements relating to those were negotiated separately and designed to supplement NAFTA, making the treaty more attractive to the ratifying bodies. A side agreement is also termed as a supplemental agreement.