The German Federal Government has expanded subsidies for employees with low gross wages (midijob employees) as of January 1, 2023, and raised the upper earnings limit to 2,000 euros. As a result, around 6.2 million midijob employees will benefit from paying reduced social security contributions...

This paper contributes to the debate about the optimal design of tax-transfer systems. Based on the theory of optimal taxation, combined with microsimulation and microeconometric techniques we derive the welfare function which makes the current German tax and transfer system for single women...