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A recent survey of rigorous impact evaluations of programs to help small and medium-size firms to formalize indicates that the programs do not seem to work for most informal firms. One of the few exceptions finds large effects of a tax simplification program in Brazil called SIMPLES on firms' formalization rates and performance indicators. Using the same data set but a different identification strategy, another study concludes that the program had limited effect on formalization rates. The aim of this paper is twofold. First, it revisits the two studies to reconcile their conflicting conclusions. Second, it investigates the validity of the identification strategy of both studies. The findings suggest that the conflicting results between the two studies are caused by the dates each used to identify when the program was put into effect. A robustness check indicates that data heaping and seasonality around November cast doubts on the identification strategy used in both studies to estimate the effect of this particular program.

Business Environment. --- Business Taxation. --- E-Business. --- Education. --- Finance and Financial Sector Development. --- Private Sector Development. --- Regression Discontinuity Design. --- Science and Technology Development. --- Science Education. --- Scientific Research and Science Parks. --- Simples Program. --- Small Scale Enterprise. --- Sme Development.