When purchasing a second-hand car in one state (like Delhi) and registering it in another (like Madhya Pradesh), the RTO tax calculation is crucial. Generally, RTO registration fees are paid once and are valid for the vehicle's lifetime. For inter-state transfers, you'll typically only pay local NOC and transfer fees in the new state. It's advisable to confirm specific tax amounts and required documents, such as PUC, insurance, and road-worthiness certificates, directly with the concerned RTO office as local laws and procedures can vary.