New Delhi, Oct. 11 -- The Union government has signalled its support for a plan by OECD nations to make big digital companies such as Facebook and Google pay taxes in countries where they have a significant number of users, a proposal that could lead to a revenue windfall for a country like India that has an online population of millions.

OECD, or the Organisation for Economic Co-operation and Development (OECD), includes some of the most prominent economies among its members and the proposal, experts said, would alter fundamental international tax principles but could face opposition from the firms that are mostly based in the United States of America.

According to two government officials who asked not to be named, India has given an "i...