We explore the effects of subsidies by means of a model of firms' decisions about performing R&D when some government support can be expected. We estimate it with data on about 2,000 performinga nd nonperformingS panishm anufacturingfi rms. Wec omputet he subsidies required to induce R&D spending, we detect the firms that would cease to perform R&D without subsidies, and assess the change in the privately financed effort. Results suggest that subsidies stimulate R&D and some firms would stop performing in their absence, but most actual subsidies go to firms that would have performed R&D otherwise. We find no crowding out of private funds.Publicad