The top tax rate is about 50% counting national and state taxes (give or take a few percentage points.. I would consider that a fairly aggressive tax rate, and there are few places in the world with a higher one.
Usually where people debate is the tax cuts people can get under certain circumstances. Those cuts, however, are availible to everyone and usually (with a few exceptions) rather fair.
As for a source on that, i mean a quick google search will give you tax rates by bracket so not sure what you want sourced.