First Minister John Swinney has been reported to Police Scotland by independence activist Sean Clerkin, who previously triggered the investigation that led to former SNP chief executive Peter Murrell's conviction for embezzlement.
The Sun says Mr Clerkin lodged a complaint after Mr Swinney acknowledged that money raised by the SNP in 2017 for a future independence referendum campaign had been spent on general party campaigning.
Speaking after visiting a Glasgow police station, Mr Clerkin said: "Now John Swinney has admitted it was used for general campaigning. Appropriating money for one thing and using it for another is fraud, plain and simple."
The complaint relates to around £600,000 raised from supporters, which the SNP had previously described as being "ring-fenced" for a future referendum campaign.
An SNP spokeswoman said: "These were the issues which were fully explored during the course of the forensic police investigation. In the course of those inquiries, the police uncovered that the SNP had been the victim of embezzlement by its former chief executive. No action was taken against the SNP."
Police Scotland said officers from its economic crime unit would assess the information provided.
Meanwhile, The Times reports that prosecutors dropped hundreds of transactions worth almost £59,000 from the indictment against Murrell as part of the plea deal that secured his guilty plea.
The removed items reportedly included women's clothing, books linked to Nicola Sturgeon's favourite authors and hair styling products, prompting claims from critics that Murrell was seeking to spare his estranged wife further embarrassment.
The Crown Office said accepting the plea was in the public interest and provided a proper basis for sentencing.