John Green, who represented the Post Falls area, will serve six months in federal prison for his role in the tax dodging scheme.
Green helped a client, Thomas Selgas, avoid paying $1.1 million in income tax over the course of more than a decade.
Selgas’s charges included one count of conspiring to defraud the government and one count of tax evasion.
Green’s fellow House members voted to expel him shortly after his felony conviction, though some lawmakers debate that characterization.