Nope, that's income taxes. Increases in the value of an asset (such as bitcoins owned) is capital gains taxes, which is 20% MAX and normally in the 10 to 12% range in the US.
For those in the higher income brackets, you're looking at 30%.
I believe its only 20% if you hold long term (more than 1 year) and you are not in upper income brackets already.
Im fuzzy on the details, but in my case - making about 100,000 a year after taxes, and selling before 1 year has passed, I was told I'm looking at 30% plus another 3%.
So thats just me. I know its lower for those making less.
Germany has 0% capital gains. If I was in europe, I would take a road trip to Germany ....