Claiming interest within payment proceedings may pose several problems in practice, not merely in terms of whether it is appropriate to claim them in the first place, which is sometimes questioned by our own courts, but also in terms of updating the settlement. The amendment to article 816 of the Spanish Civil Procedure Act, by Law 42/2015, of 15 October, clarifies the steps that the creditor must follow when requesting the enforcement and, in this sense, contributes in principle to facilitating the settlement of interest. In this article we will set out different practical issues that arise regarding the claiming and settlement of interest within payment proceedings.