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A new cascade model multilevel inverter for generating 21 voltage levels has been proposed in this paper. Results obtained from this model and conventional cascaded H-bridge (CHB) inverter are compared. To generate 21 – level output voltage by using CHB ten H-bridge modules are required and each module consists of four numbers of switching devices. Whereas the proposed cascade model has sub-multilevel inverter blocks, are connected in series. This topology results in reduction of installation area, cost and simple control system. The performance of both topologies was observed by MATLAB/SIMULINK. MODELING AND ANALYSIS OF 21 LEVEL CASCADE MODEL MULTILEVEL INVERTER