This paper analyzes revenue and welfare effects of implementing a FAT both from a theoretical and a quantitative perspective. The theoretical analysis allows us to derive expressions for the revenue effects and the deadweight loss in a general equilibrium setting, which can be quantified with a minimum of information about the economy and key elasticities. Using data for Germany, the empirical quantification suggests that introducing a modest FAT with a rate of 3% results in a revenue gain of about 1.312 bn. If this revenue gain is used to reduce distorting labor taxes, the results point at a welfare gain of 1.092 bn. Comparing these results with Buettner and Erbe (2012), we find that the introduction of a FAT of 3% would generate similar revenue and welfare effects as a repeal of the financial sector VAT exemption (with a 19% VAT rate). However, taxing financial services through FAT may exert adverse location effects on financial service production.