We analyze the compliance costs of individual taxpayers resulting from the German income tax (tax year 2007). Using survey data that have been raised between December 2008 and April 2009, we find evidence for a considerably higher cost burden of self-employed taxpayers. Taxable income and a higher education (university degree) are positively correlated with compliance costs, while the time effort of female taxpayers is significantly lower. By contrast, joint filing of married couples reduces the burden of tax compliance. The aggregate cost estimate of German income taxpayers amounts to €6 to €9 billion, respectively, 3.1 to 4.7 percent of the income tax revenue in 2007. This estimate is higher than latest projections

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In a controlled laboratory experiment, subjects had to fold letters in order to earn money. While the net income per letter was the same in the three treatments, the gross income varied and the tax rate was 0, 25, and 50 percent. Although work incentives should be the same in all treatments, subjects worked harder and longer when they were taxed. We conclude that this is because of a net wage illusion effect. The existence of this effect demonstrates that not only are the tax rate and the tax base of importance for work incentives, but the perception of a tax is also important.

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