At his debut news conference Monday as chairman of the government's Tax Commission, Yutaka Kosai was tight-lipped on the politically sensitive corporate and consumption tax rates, despite his reputation as an outspoken economist.

Kosai, 73, carefully avoided discussing when or how much the effective corporate tax rate could be cut. Neither did he commit on raising the consumption tax.

The seasoned expert only said the commission will draw a conclusion on the corporate tax based on a consensus of its members.