This table has just been published by the OECD and shows the "tax wedge" taken from employment earnings for all 34 OECD countries:
The OECD say of this:
Note then that this "wedge" includes employer's national insurance - which most people do not appreciate is paid on their behalf.
The UK is at 32.3%, well down the list.
Of course, that may also be why we have such a high deficit: we are undertaxing high earnings in particular.
But there's no case for saying we're overtaxed, most especially at high rates. That's for sure.