Federal prosecutors ordered convicted ex-Brooklyn Sen. John Sampson to pay up a $75,000 fine from his retirement account, court documents show.

Sampson, once the Democratic leader of the New York Senate, is now serving five years in federal prison for obstruction of justice charges and faces the court-imposed fine.

Prosecutors filed an order last week to Chief Judge Dora Irizarry of Brooklyn’s federal court to have JPMorgan Chase Bank turn over $74,975 from Sampson’s retirement account.

As of Aug. 31, the senator who represented Crown Heights, East Flatbush, parts of Brownsville and Canarsie, only paid $325 toward the fine.

Sampson, 52, was sentenced in January after a jury convicted him for lying to federal agents and obstructing justice in a mortgage fraud case of a friend.

He is now serving his sentence in a federal prison in Fairton, New Jersey, and is appealing the case, according to court documents.