Natarajan and three others were convicted for conspiracy, forgery, cheating and tax evasion and sentenced to two years in jail in the case by a CBI court in 2010.
However, the order was stayed by the High Court against which the CBI had filed a petition.
During the tenure of Chief Justice Sanjay Kishan Kaul, who was recently elevated to the Supreme Court, the CBI had sought an early hearing of the case.
The case relates to the import of a Lexus car in 1994, declaring it as a used vehicle.
The CBI and Enforcement Directorate had registered separate cases against Natarajan and three others after it was found that the documents presented by them were fabricated, allegedly causing a duty loss of more than Rs one crore to the exchequer.