Measuring the Invisible: An Overview of and Outlook for Tax Non-Compliance Estimates and Measurement Methods for Switzerland Felix Schmutza JEL-Classification: E26, H26, O17 Keywords: Shadow Economy, Underground Economy, Tax Compliance, Tax Evasion SUMMARY This paper gives an overview of tax non-compliance estimates and evaluates the suitability of various tax non-compliance measurement methods for Switzerland. The existing estimates for Switzerland focus strongly on non-declared assets and are based on a limited number of measurement methods. Nevertheless, the estimates range widely, between CHF 106 to over 500 billion for non-declared assets and 12.6 to 35.1 percent for income, for the time period 1970 to today. These estimates could be taken as a starting point for further tax non-compliance research. They should however be verified and supplemented by estimates result- ing from other methods as a solid measurement of tax non-compliance requires a comprehensive approach including several methods. Further, the focus should shift from non-declared assets towards non-declared income. a University of Lucerne, Department of Economics, Frohburgstrasse 3, PO Box 4466, 6002 Lucerne, Switzerland and Lucerne School of Business, Institute of Financial Services Zug (IFZ), Grafenauweg 10, PO Box 4332, 6304 Zug. Email:
[email protected]. This paper is part of a doctoral thesis of Felix Schmutz at the University of Lucerne. Many thanks to Prof. Christoph Schaltegger, Prof. Rafael Lalive and two anonymous referees for their valu- able input and comments. © Swiss Society of Economics and Statistics 2016, Vol. 152 (2) 125–177 126 Felix Schmutz 1. Introduction Since the aim of tax non-compliance is to hide income or assets from being iden- tified and taxed, quantifying and analysing tax non-compliance is a challenging task.