Purpose Reducing informal payments (IPs) for health services has always been a top priority for health policymakers all over the world. As the newest attempts to reduce IPs, Iran’s Government applied a set of reforms in the health care system in 2014 called “Health Sector Evolution Plan” (HSEP). The purpose of this paper is to investigate the prevalence and nature of IPs one year after implementing this plan. Design/methodology/approach This descriptive and cross-sectional study was a nationwide survey on Iran's health sector informal payments carried out in 2016. To do this, a sample of 1,112 Iranain households was selected from all over the country using a multistage cluster-stratified sampling method. The prevalence and nature of IPs were determined through conducting face-to-face interviews using a standard questionnaire. Findings One year after implementing the HSEP, about 27.7 percent of sampled Iranians had at least one experience of IPs for health services. The prevalences of compulsory and voluntary IPs were 21.4 and 11.5 percent, respectively. IPs were reported by 26.1 and 12.5 percent in the inpatient and outpatient services, respectively. Originality/value According to the results, compulsory IPs are still prevalent in both the outpatient and inpatient services of Iran’s health system and it seems that the HSEP has not been completely successful in achieving the goal of eradicating IPs. It can be said that the HSEP has been the first step toward eradicating IPs in Iran and should not be the last one. The study provides useful results of the prevalence and nature of IPs after implementing the HSEP, which should be considered in designing the next steps.

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