This paper aims to (i) establish the micro-parametric variation in the development of the subjunctive CP in Romanian languages (Daco-Romanian/DR; Aromanian/AR; Megleno-Romanian/MR; Istro-Romanian/IR) and (ii) account for derivations in which the subjunctive is integrated into the formation of the periphrastic future in these languages. Briefly, the analysis points out that the subjunctive CP in Romanian languages can display a split Fin (unlike in other Balkan languages) and that the remerging of the split Fin finds itself at different stages: complete in DR, but incomplete at different degrees in AR, MR, and IR. The compatibility of the subjunctive morphology with the derivation of the periphrastic future follows from the semantic bleaching and grammaticization of the volitional ‘will’ and ‘have’ verbs, together with the Balkan Sprachbund subjunctive mood marking, which combine in a monoclausal construction via a serial verb derivation to compositionally check a Fin marked [+finite, modal].