Unconfirmed sources are stating that Mourinho allegedly owes €3.3 million in unpaid taxes to the Spanish government which, if true, is small change to the charges being brought before Ronaldo, which reportedly total €14 million and could (but won't) lead to a prison sentence for the four time Ballon d'Or victor.
According to the local prosecutor, Mourinho is under suspicion of having committed two offences in relation to personal income tax. Ronaldo is expected to testify at the end of July.
Big names in football are being accused of tax fraud in Spain recently.
The complaint was made in court on Tuesday and relates to the Portuguese coach's time in charge of Real Madrid.
The accusation against Mourinho comes a week after the Madrid-based prosecutor's office accused Real Madrid forward Cristiano Ronaldo of defrauding Spain's tax office of 14.7 million euros (£12.9 million).More news: Carrie Fisher had number of drugs in system
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Prosecutors say Mourinho owes Spanish authorities €3.3m after failing to declare revenues from his image rights "with the aim of obtaining illicit profits".
Mourinho is yet to comment on his case, but the Spanish authorities must be having a field day with this bunch.
He was handed a 21-month sentence, alongside his father Jorge, while Neymar will also stand trial later this year over his move to Barcelona from Santos.
Portuguese-born Mourinho is accused of defrauding Spain of €3.3m (£2.9m; $3.6m) in taxes between 2011 and 2012.