Abstract: The financial crisis has emphasized the importance of the credit crunch in constraining the financing of the firms. The debt capacity from banks is defined as the maximum amount of debt that the banks are available to grant to companies. Using annual report’s data and information from Centrale dei Rischi of Bank of Italy on a set of 321 industrial firms some econometric models on bank overdrafts have been estimated. Applying the models estimated on 2009 data to 2011 data has been obtained an appraisal of the credit crunch between 14% and 15% of the total bank lending to these companies.