It is on top of the prison sentence he received last week.
Manafort was convicted on tax and bank fraud charges last year.
The former Trump campaign chairman was found to have broken his plea deal.
The jury deliberated for four days before announcing the verdict at the federal courthouse in Alexandria, Virginia.
Dutch lawyer Alex van der Zwaan was the first person to be sentenced in a probe into alleged links between Donald Trump's team and Moscow.
FBI agents have searched one of the homes of Donald Trump's former election campaign chairman Paul Manafort.