The study uses new methodology developed by Corrado, Hulten and Sickel in 2006 for measuring the intangible assets in Bulgaria and the factors that premise it. The study ranges data for 1990-2006. The data are aggregated from firm to sector level when reporting the import and export. Intangible assets are: costs for software and computer databases, innovative property, R&D costs, property rights, costs for acquiring licenses, architecture and engineer design, trademarks property, brands and economic compensations, costs for market research and brand advertising, specific firm human capital and organization structure. Recalculating by the new methodology, the paper shows the contribution of the intangible assets in forming GDP in the studied period. It takes into consideration the deep changes in the Bulgarian economy in the analyzed period, like the carried out privatization, the collapse of the industry, the financial crisis in 1996-1997, and the mass introduction of FDI. [ABSTRACT FROM AUTHOR]