Nishikawa Ukon, head of one of the five major Japanese "butoh" dance schools, failed to declare about 150 million yen in income over a six-year period to 2001, sources close to the case said Saturday.

The Nagoya Regional Taxation Bureau has levied about 80 million yen in additional taxes on Nishikawa, including a surcharge, and he has agreed to submit revised tax returns, the sources said.

Nishikawa failed to declare part of the revenues related to sales of tickets for his school's well-known "Nagoya Odori" dance performances that were sold through apprentices, as well as gratuities collected at recitals, the sources said.

Nishikawa also failed to report licensing fees, each totaling 400,000 yen, that he received from apprentices, according to the sources.

Tax authorities are believed to have ruled that Nishikawa has been hiding the revenues to reduce the amount of his taxable income.

"I believe that I've been accurately declaring income, but I've decided to follow the orders of the taxation bureau," Nishikawa said. "I'm sorry for causing trouble for those concerned."