wundertax is a free Android application from wundertax GmbH, which aims to provide a simple and easy way for employees to create their tax returns. The app is designed to guide users through the process of creating a tax return with ease, saving them time and money. Unlike the state-run ELSTER program, which can be complicated and time-consuming to use, wundertax's tool is tailored to the needs of employees and is user-friendly.

The app offers a range of benefits, including automatic insertion of data into forms, consideration of all costs and allowances that are work-related, and recognition by all German tax offices. Users can also benefit from the integration of a live tax calculator, which shows them how much of their salary they can expect to be refunded. Additionally, wundertax offers free technical support and the highest standards of security for users' sensitive data.