> As of 1 January 2008, Germany’s corporation tax rate is 15%. Counting both the solidarity surcharge (5.5% of corporation tax) and trade tax (averaging 14% as of 2008), tax on corporations in Germany is just below 30%.
You're paying income tax at the highest rate. The calculation in the linked document is about "business taxes". So subtracting just half of the money "because of taxes" is not correct as you'll probably not pay that much in taxes for a business.