The FASRB established the International Sava River Basin Commission, as the joint institution having the international legal capacity being necessary for exercising its functions. It is consisted of two representatives of each Party to the FASRB, namely one member and one deputy member of each Party, having just one vote in the Sava Commission.

The Seat of the Sava Commission is Zagreb, Republic of Croatia. Status of the Sava Commission in the Republic of Croatia is regulated by the Seat Agreement between the Sava Commission and the Government of the Republic of Croatia signed on November 02, 2005, in Zagreb. Pursuant to the “Seat Agreement”, the Sava Commission has the international legal capacity and legal personality necessary for exercising its functions in Republic of Croatia, and enjoys the status of international organization having the usual privileges and immunities. The Government of Republic of Croatia also ensured the working premises of the Sava Commission and its Secretariat seated in Zagreb.

For purpose of implementation of the FASRB, the Sava Commission passes two kinds of acts: decisions and recommendations. Decisions are being passed in the field of navigation aimed at providing the navigation safety, the requirements for financing the construction of waterways and their maintenance, and its work, budget and procedures.
Decisions are passed unanimously and, according to the FASRB, they are mandatory for all Parties, unless, for decisions from the field of navigation, any of the Sava Commission members withdraws his vote within 30 days after a decision has been made, or informs the Sava Commission that the decision is subject to the approval of the relevant authority of his State. On all other matters regarding the implementation of the FASRB, the Sava Commission passes recommendations.