 In financial disclosure forms, Carson and his wife reported income of between $8.9 million and $27 million from January 2014 to May 3, 2015, when he announced his presidential campaign.Over that period, Carson received over $4 million from 141 paid speeches; between $1.1 million and $6 million in book royalties; between $200,000 to $2 million as a contributor to "The Washington Times" and Fox News; and between $2 million and $10 million as a member of the boards of Kellogg Co. and Costco Wholesale Corp.He resigned from Costco's board in mid-2015, after serving on it for more than 16 years.