Tax Evasion

Tax Evasion - is the intentional and fraudulent underpayment or non-payment of taxes. It is paying less than the legally due tax liability by using illegal methods. The crime of tax evasion involves deliberately misrepresenting or concealing the nature of financial affairs to the tax authorities to reduce their tax liability, and may include such dishonest tax reporting tactics as under declaring income, profits or gains; or overstating deductions.

Source: http://definitions.uslegal.com/t/tax-evasion/