Background: There are currently 14% independent participants in Indonesia's National Health Insurance (INHI) from the overall (199 millions) participants. However, around 43.8% of them do not comply in paying the insurance premium. The purpose of the study is to explore factors that influence delinquent payment of contributions. Methods : The research design was qualitative study with phenomenology approach and constructivism paradigm. Data collected by in-depth interview and using theoretical sampling approach. We recruited 16 respondents of unpaid worker participants who arrear and who obey to pay the premiums from 4 difference cities/ districts. Triangulation was done trough 15 respondents from various stakeholders. We constructed substantive theory from data trough coding, cathegorizing and pattern matching. Results: Compliance of paying insurance premium is affected by the intention to pay for contribution. Meanwhile, the intention to pay is influenced by the understanding of INHI program, financial ability, self attitude, operational system and service quality. These constructs consist of 5 to 8 indicators. To improve payment contribution of independent participants, INHI program has to pay attention for factors originating internally from the participants themselves and also externally: social and institutional environment support and the quality of health care and financing system. Conclusions: INHI program need to improve a proper socialization, mechanisms for collecting beneficiary contributions, and strengthening the healthcare system, both for services and the implementation of the financing system.