The group controls Tata Steel Ltd, which bought Anglo-Dutch steel maker Corus for USD 12.9 billion this year, and Tata Consultancy Services Ltd, the country's top software services exporter.
"This year it will be much greater than that because of Corus," Alan Rosling, executive director at Tata Sons, the holding company of Tata Group, said on the sidelines of a conference.
"This year, it will be greater than 60 per cent," Rosling said, adding that the overseas revenue share may come down after 2007/08 because the group is heavily investing in India.
"There are big, big businesses that we are either growing or creating here in India; retail, property, infrastructure. Many things are happening here in this market," he said.
"It's going to be a balance."