And Real Madrid have now backed Ronaldo - saying they remain confident the forward will clear his name because of his "clear will" to adhere to Spain's tax laws.
The prosecutor's office in Madrid has stated that it has filed a lawsuit against the Portuguese forward.
Cristiano Ronaldo has denied through his representatives he has ever committed tax fraud in Spain, after a lawsuit was filed against the Real Madrid and Portugal star.
The prosecutor also said that Ronaldo "intentionally" did not declare income of 28.4 million euros ($31.8 million) made from the cession of image rights from 2015-20 to another company located in Spain.
Spanish prosecutors sued the soccer superstar Tuesday for tax evasion, according to Bloomberg's Tariq Panja.
Ronaldo has been accused by the Spanish authorities of defrauding the authorities of around 15 million euros between 2011 and 2014, but on Tuesday denied the allegations.
In a statement, representatives of the world's highest paid footballer said there had never been concealment, or the slightest intention to hide.
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The Barcelona striker and his father were found guilty of using companies in Belize and Uruguay to avoid paying taxes of €4.16m on income earned through the sale of image rights between 2007 and 2009.
"It's only goal was to create a screen to hide the totality of his image rights income from the Spanish tax authorities", read the prosecutor's statement.
It added that it is "convinced" that Ronaldo "will demonstrate his complete innocence".
"Throughout all of the abovementioned years, CR never had a tax problem, contrary to what the Spanish Prosecutors insinuates".
Ronaldo becomes the latest high-profile footballer to become involved in a Spanish tax case.
Cristiano stands accused of failing to pay millions of euros in tax between the period of 2011 and 2014.
Argentina global and Barcelona forward Lionel Messi was sentenced to a 21-month jail sentence and €2.09m fine previous year for tax fraud.
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