Any credible calculation[0] puts the tax burden of all groups at 50% at most (and most middle class is not taxed at that number) – including all taxes, contributions, levies, and VAT. You would have to add the employer's contributions to that number (but they are less than 10%).

A better measure would be the tax quota (gross national product divided by all taxes and contributions) which is about 35%. This is the effective rate the state gets for everything it does.

[0]: Such as the RWI study which really can't be accused of downplaying the numbers http://shop.freiheit.org/download/P2@675/96532/A4_Steuern%20...