Cologne, the fourth largest city in Germany, enjoys record high revenue this year thanks, in part, to taxation of prostitution, which is legal in Germany.

The city is said to have received $1.1 million (828,000 euros) in sex tax in 2006, which was first instated in 2004. Sex workers have to pay 150 euros per month in taxes. This year, Cologne also began a part-time prostitution tax of six euros per day as they proved they only work a few days in a week.

The sex tax is part of the pleasure tax that’s prevalent in the city where it was originally only placed on casinos and arcades and expanded to include bordellos, massage parlors and “table-dancing clubs.” Apart from Cologne’s mandatory prostitution tax, sex workers throughout Germany also pay income tax and value-added tax (VAT).