In Brittany under the Old Mode, the fouage is a provincial tax.

It is a real size raised on fires commoners. At the 18th century, there were approximately 32.400 fires in Brittany. They were much more numerous with the origne, but some had been anoblis (approximately 10%) and others had been repurchased (25%).

With its inevitable supplements, the ordinary fouage was worth 1.100.000 books in 1788. But regularly, the provincial States raised extraordinary fouages much higher, which were announced like loans, but ever refunded. In 1789, the Third-State of Brittany claims nearly 300 million to the provincial States! That starts the hostilities with the Breton, large nobility profit of the system.