The former Manchester United star argued that he was owed nearly £17m after privately agreeing to postpone payment of his salary.
But Juventus never paid the money back.
And they did not report the agreement in their financial statements.
Ronaldo was forced to go to a tribunal to get his cash back, with the panel taking his side.
However, it was ruled that Juve only have to pay Ronaldo half the fee.
He will receive just £8.3m after the tribunal ruled that both parties shared responsibility over the arrangement.
Ronaldo spent three years at Juventus between 2018 and 2021 after a shock £90m move from Real Madrid.
The legend scored 101 goals in 134 games while winning two Serie A titles and one Italian Cup.
