Iowa’s business climate is “competitive” but not “overperforming” in five categories, according to the Iowa Business Council’s annual Iowa Competitive Dashboard.IBC pointed to an “overly complex tax system” as one of the immediate challenges facing the state’s business climate. Iowa is ranked 46th in corporate tax index and 40th in individual income tax index out of all 50 states, the organization said, using publicly available data.“That remains a challenge as we try to attract and retain businesses in Iowa,” said Tim Yaggi, IBC’s chairman and Pella Corp.’s president and CEO, in an online news conference.Longer term, the state’s declining population has IBC members concerned.“It’s not a simple issue,” IBC Executive Director Joe Murphy said.