In 2013 I built an app essentially for myself to solve the recurring problem of sales tax declaration in Germany. I have to do this quarterly or monthly and fil

In 2013 I built an app essentially for myself to solve the recurring problem of sales tax declaration in Germany. I have to do this quarterly or monthly and filling out all the official forms was painful and time consuming. So I came up with http://kassomat.net http://kassomat.net An SPA with a simple yet accurate approach where you just enter 4 key numbers and are done in under a minute. Due to my recent lack of time I was not able so far to adjust the App to the latest official API's, but that's doable. Open to offers.