MANET (Mobile Ad-hoc NETwork) is self-directed and infrastructure less network. MANETs contains mobile nodes that are free to move in the network. Nodes can be the devices like mobile phones, PDA, MP3 players and personal computers which are participating in network. MANET has the dynamic topology due to the node movement. Transmissions of the packet between the mobile devices are overcome by the routing protocol. Selfish node is a major problem in MANET. Selfish nodes are nodes that do not participate in forwarding process. An incentive based scheme is proposed to detect the selfish node in MANET.