Tax Morale and Optimal Taxation

We study experimentally how taxpayers choose between two tax regimes to fund a public good. The first-best tax regime imposes a general, distortion-free income tax. However, this tax cannot be enforced. The second-best alternative supplements the income tax by a specific commodity tax. This tax cannot be evaded but distorts optimal consumption choices, instead. The result is that a large majority of subjects prefer the general income tax regime. The bulk of votes is consistent with actual payoffs. We isolate tax morale as cause for payoffs above theoretical predictions.