"The income earned from illegitimate means could be classified as a criminal offence in the Income Tax Act", said a senior Finance Ministry official.
The official said the issue of tightening the tax laws is being considered by a committee set up by the government to suggest measures to check the menace of black money and prevent its generation.
Generally tax avoidance on income earned through legitimate sources is treated as a civil offence under the Income Tax Act.
Elaborating on the possible illegitimate sources, the earnings from which could be classified as a criminal offence, the official said:
"These could include income from bribe, corruption, terrorism, narcotics, money laundering etc".
Once such deeds are classified as "criminal offences" under the Income Tax laws, it would become easier for the tax authorities to "quickly book" such culprits and recover the income from illegitimate means, sources said.
The issue of making tax evasion a criminal offence is being considered by a high-powered committee headed by the chairman of the Central Board of Direct Taxes.
The mandate of the panel is to suggest within six months changes in laws to curb generation and recover black money and prevent its illegal transfer abroad.