Embodiments herein disclose methods and systems for accounting for MPTCP data usage. The embodiments include tracking MPTCP data usage of a plurality of applications. The embodiments include reporting the MPTCP data usage information to a data tracking module. Each of the plurality of applications is associated with a UID, which is tagged with MPTCP packets of the plurality of applications. The MPTCP packets of the plurality of applications can be transferred through at least one sub-socket, in at least one sub-flow. The at least one sub-flow can be associated with the system (OS) ID. The embodiments include updating the system UID, associated with the at least one sub-flow, with UIDs of the applications, whose data is included in the at least one sub-flow.