Addressing a news conference, Swamy alleged that Rahul and Sonia jointly owned 76 per cent of a company called Young Indian.
He also accused Rahul of not disclosing about this company in his affidavit to the Election Commission while filing his nomination for the 2008 Lok Sabha elections.
He said that public funds were converted to finance the privately-owned company. He has also claimed that meetings of the company were held at 10 Janpath, Sonia Gandhi's govt-allotted official residence, which was against the law.
He said that Young Indian now 'owns' the Herald House in Delhi and two floors of it have been rented out to passport office that pays the company Rs 30 lakhs a month as rent, of which, 76% goes to Rahul and Sonia.
Swamy has demanded a CBI inquiry into the case.