U.S. Bureau of Prisons spokesman Chris Burke said Jackson was in custody at the Butner Federal Correctional Complex as of 11 a.m. EDT, Chicago media reported, though the Bureau of Prisons website still lists him as not in custody.
The disgraced former congressman was turned away from the prison Monday due to a paperwork problem, WLS-TV, Chicago, reported, citing Rep. G.K. Butterfield, D-N.C., who accompanied Jackson.
Jackson, 48, son of the Rev. Jesse Jackson and who is to be inmate No. 32451-016, pleaded guilty to stealing $750,000 from his campaign from 2005 to 2012 to pay for luxury items, vacations, furs, celebrity memorabilia and even a pair of elk heads.
His wife, Sandi, 49, a former Chicago alderman, was sentenced to 12 months in prison for omitting $580,000 in income from the couple's tax returns while they lived lavishly.
U.S. District Court Judge Amy Berman granted a request from the couple, who have two children, ages 9 and 13, that they be allowed to serve their sentences one at a time.
Berman said when Jackson Jr. is released, Sandi Jackson will have 30 days to surrender.