Then your Finanzamt was nicer than mine. With me they wanted proof of basically everything. Since I didn't have a logbook for all of those rides, they gave me an estimated amount of "free rides" (to and from my homebase) per month.
I would be careful with easydutyplan. It's a nice tool if you do it right. If you exaggerate, which is easily done in the program, you run a big risk of having to pay more in the end or much worse, get a yellow letter that states you have two weeks to pay a huge amount of money to them.
