The influence of two different spark plasma sintering-based processing routes (i.e., reactive SPS (RSPS) and non-reactive SPS) on the properties of TaB2-TaC composites was investigated. Ta2O5 and B4C powders were used as starting materials in the RSPS method, and synthesis and densification of TaB2-TaC composites were accomplished in a facile single step. The effect of sintering temperature and time on the microstructure and densification of the in-situ RSPS were investigated. The obtained results were compared with non-reactive spark plasma sintered TaB2-TaC composites. The highest densification (~ 99.5 %) was achieved for the TaB2-TaC composite with 6.64 vol% TaC after reactive sintering at 1550 °C under 40 MPa with a 5 min holding time. Although lower SPS temperature was used in the RSPS method, better densification and higher Vickers hardness were obtained compared to the non-reactive SPS. While platelet-shaped TaC formation was observed in both processes, the average grain size was smaller in the sample produced by the RSPS method. On the other hand, no significant difference was detected in fracture toughness and oxidation behavior of the composites produced by RSPS and non-reactive SPS.