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How should payment systems of means-tested benefits be designed to improve the financial situation of needy recipients most effectively? We study this question in the context of mandatory health insurance in Switzerland, where recipients initially receive either a cash transfer or subsidized insurance premiums (a form of in-kind transfer). A federal reform in 2014 forced cantons (i.e. states) to universally switch to in-kind provision. We exploit this setting based on a difference-in-differences design, analyzing eight years of rich individual-level accounting data and applying a machine learning approach to identify cash recipients prior to the reform. We find that switching from cash to in-kind transfers persistently reduces the likelihood of late premium payments by about 20% and of government debt collection for long-term missed payments by approximately 12%. There is no evidence for a negative spillover effect on the timely payment of the non-subsidized co-pay bills for health services after the regime change.