Hello Sir, As per the details provided by you, it appears that you act as bridging gaps between potential clients and doctors and charge a service fee. In such cases, Service Tax is applicable and it is to charged on the Service Fee which in your case appears to be Rs.500/-. Hope this clarifies your query. Please feel free for any further clarifications. Thanking You. Regards, CA Rohit R Sharma BCOM, CA, LLB - GEN, CERT. FAFP, CERT FAFD.