The studies were conducted by the Delhi-based National Institute of Public Finance and Policy (NIPFP) and National Council of Applied Economic Research (NCAER), and National Institute of Financial Management (NIFM) at Faridabad.
"Report from one institute has been received and accepted and reports from the remaining two institutes have been received but yet to be accepted by the government so far," the Finance Ministry said in reply to an RTI query.
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It, however, declined to share the contents of the reports citing the exemption clause under the transparency law.
"Further details cannot be made available at this point of time as the information is exempt under Section 8(1)(c) and Section 8(1)(e) of RTI Act, 2005, since the report is yet to be examined by the government or action taken thereof is yet to be laid before Parliament," the ministry said.
Section 8(1 )(e) bars disclosure of information which would cause a breach of privilege of Parliament. The other clause exempts disclosure of "information available to a person in his fiduciary relationship, unless the competent authority is satisfied that the larger public interest warrants the disclosure of such information".
The three studies were expected to be completed within 18 months' time, which deadline had expired on September 21, 2012. The Finance Ministry did not give the dates on which these reports were submitted with it although the RTI application had also sought that information.
There is at present no official assessment on the quantum of black money in India and abroad.