Using a panel of German income tax accounting data from taxpayers with no business income (employees), we find a negative relationship between tax preparation expenses and tax liabilities. However, preparation expenses are shown to exceed estimated tax savings. Specifically, one additional Euro spent on preparation yields an estimated tax savings of 72 cents in an OLS regression and 24 cents in a fixed effects regression. In addition, we observe substantial heterogeneity in tax savings among income groups, but even if we account for long‐term tax savings, tax liability reductions exceed tax preparation expenses only for the highest income quintile. In all other income quintiles, average preparation expenses exceed the estimated tax and time savings. Based on these results, we also examine whether other specific benefits affect an individual's decision to purchase tax preparation services, and the results indicate the importance of the benefits of coping with complexity and reduced uncertainty. Overall, our findings illustrate that the current tax compliance process violates at least two of Adam Smith's principles of taxation, taxes are neither certain nor fair.

In three experiments, we examine how the widespread phenomenon of overwithholding affects retirement savings and how the additional option at tax time of saving retroactively for retirement affects total savings levels. Our results show that overwithholding significantly reduces retirement savings. We show that this outcome can be explained by individuals' anchoring on their take‐home pay when making savings decisions and by individuals' reduced motivation to save in the presence of overwithholding. Moreover, we find that the introduction of an additional retroactive savings option at tax time increases overall savings by providing information about the correct after‐tax income and by emphasizing the importance of a savings norm that nudges individuals to save. Furthermore, our findings demonstrate that immediate taxation (back‐loaded retirement plans) results in greater effective savings than deferred taxation (front‐loaded retirement plans), irrespective of whether there is overwithholding or the existence of an additional option to save. Policy‐makers may therefore consider both the introduction of an additional savings option at tax time and immediate taxation as policy tools to encourage retirement saving.