WISO steuer:App 2016 is a free business and productivity app offered by Buhl Data Service GmbH for Android users. The app is designed to help users with their tax returns, and it is one of the best tax apps for the tax year 2015, as tested by Computerbild (HeftWISO steuer:App 2016 enables users to access their tax returns at any time, from anywhere, and on any device, be it at home, in the office, or on the go. The app offers users the ability to input data, verify information, and make additions to their tax returns. The app also provides users with tips on how to save on their taxes through 145 new video clips and steuertipps. Additionally, the app features a new steuer:Rechner that allows users to keep track of their tax calculations, and it now includes the Umsatz- und GewerbesteuererklärungThe app also comes with TÜV Süd certification, ensuring quality. Users can submit their tax returns and data retrieval via ELSTER and Vorausgefüllter Steuererklärung (available from January 2016).