The practice of making informal payments in the health sector is common in a number of countries. It has become an important policy issue around the world. These payments can jeopardize governments' attempts to improve equity and access to care and policies targeted to the poor. It is widely believed that a considerable amount of out-of-pocket payment in the health sector in Turkey is informal. To examine this issue, we used a questionnaire adopted from a wider international study. We concluded that informal payments in Turkey are significant and have important implications for health care reform.