On 2 December 2020, the Spanish Senate adopted the law for the ratification of BEPS MLI. On 7 June 2017, Spain signed the Multilateral Instrument (MLI). Spain will need to deposit its ratification instrument to bring the MLI into force for its covered agreements once the internal ratification process is complete.

The MLI will generally enter into force for a particular covered agreement on the first day of the month following a three-month period after both parties to the covered agreement have deposited their ratification instruments.