It has been ruled that Albert Uderzo, who provided the art for the 24 books produced between 1959 and 1979, is a "simple illustrator" who should not have received France's authorial tax break, reports The Telegraph.
It was decided that the tax break only applies to "people who have participated in writing the texts of the comic strip". Uderzo has been commanded to pay €203,000 (£171,000) to the government.
"This is an injustice and a scandal," said Uderzo. "The brutality and lack of respect with which, 51 years after creating Asterix, the tax authorities have 'woken up' to deny me the right to be co-author of my dear little Gaul - at my age I will not accept to be stripped of this title.
"It was stipulated [in the original publisher's contract] that I signed off the drawings and [co-creator] René Goscinny the texts, but that we formed one single author.
"Moreover, for each album, we met before getting stuck into the scenario to dream up a story. Goscinny worked according to my requirements and I to his."
Uderzo continued to write and illustrate Asterix novels following the death of Goscinny in 1979.