The Italian Football Association's prosecutor Guiseppe Chiné on Friday filed a prosecution in connection with a hearing in the association's appeals court in Rome.
Chiné demanded a nine-point deduction for Juventus, who are suspected of bookkeeping offences.
Later in the evening, the union came with its announcement: a 15-point deduction.
Juventus allegedly used player transfers to influence the balance sheet in its accounting.
This means that, ahead of Saturday's away match against Atalanta in the 19th league round, Juventus drops from third place on 37 points to tenth place on 22 points.
The big club will thus find it difficult to reach European games next season.
In addition to the point penalty, the association also handed out long suspensions to former board members at Juventus.
In November, chairman Andrea Agnelli and the board resigned after prosecutors in Turin investigated deliberate false accounting at the club.
Chiné called for a 16-month suspension for Agnelli and other former board members.
The association also took a tougher line there and awarded, among other things, Agnelli and Juventus' former CEO Maurizio Arrivabene to suspensions of two years each.
Friday's announcement comes 17 years after "Calciopoli", the mess in Juventus which meant that the big club lost two Serie A titles and was relegated to the second division Serie B.
Juventus can appeal the federation's decision.