I use the "tax-saving explanation" for years. The new version needs only to install. At startup, the software checks for updates and installs them then correctly. After the start you can take over the prior-year data, what you should do. This saves immense time! Then you need to change only the amounts. The software automatically expect continuously what one gets from the Treasury back (or pay extra needs). Elster or forms. Both are there and working. So far, it has always fitted to the cent.