He also asserted that developed nations must do their part in tackling the problem of corruption as money taken out illegally from developing countries often find its way to places like London.
Replying to a question on whether corruption in India remained a big issue, the outspoken central banker said, "It is an important tax on the system which impedes good decision making and impedes economic growth".
Stating that it has come down significantly in India, Rajan gave examples of railway ticketing and the tax department.
"You don't have to go to the income tax inspector to get your money back. I find it easier to file income tax in India than filing my US income tax," he said to the amusement of many present during a discussion at the Chicago Booth School of Business here.
More From This Section
Rajan said there is a very strong upsurge against corruption in India.
"This has been a process of the last few years and I think we are in a much better place than we used to be. So the grand-level corruption has diminished somewhat. Has the corruption been extinguished? Absolutely not. There is a lot of work that needs to be done," he added.
He was asked about the controversy over the UK Prime Minister David Cameron being caught on camera telling the Queen that the anti-corruption summit here would see "leaders of some fantastically corrupt countries coming to Britain".