The government of Prime Minister Narendra Modi sent out about 700,000 notices earlier this year to suspected evaders to coax them to declare hidden income and assets, known as "black money" in the country, promising they would not be pursued by authorities if they came clean and paid a penalty.
Finance Minister Arun Jaitley told reporters the four-month scheme that closed on Friday had led to 64,275 declarations, resulting in a provisional Rs 65,250 crore ($9.8 billion) in undisclosed wealth.
Mr Jaitley added the final figure would likely be higher.
Factoring in taxes owed and penalties of 45 per cent, the government could raise more than Rs 29,360 crore ($4.41 billion) from the declared income, according to Reuters calculations.
During the 2014 elections, PM Modi pledged to bring back billions of dollars in "black money" if elected. The Prime Minister, in a tweet, called the outcome of the scheme "successful" and said it was "a great contribution towards transparency and growth of the economy".
In a country of 1.3 billion, fewer than 18,000 people declared annual income of Rs 1 crore or more in 2012-13, the latest figures show.
($1 = Rs 66.5458)