Tax avoidance schemes generally refer to complex tax arrangements setup by multinational enterprices to shift profits from high-tax jurisdiction to low-tax jurisdictions.
A difficult destinction has to be made between legal tax planning, abusive tax avoidance schemes which may or may not be legal, and illegal tax evation/sham transactions and arrangements.
It is generally the case that abusive/agressive tax avoidance schemes and arrangements, “colourable devices”, “dubious methods” and “fully artificial arrangements” set up with the primary or sole purpose of avoiding taxes are not permissible – even if the transactions are otherwise individually within the letter of the law.
Illegal tax evasion – fraud or sham transactions and arrangements – are usually considered criminal and prosecuted as such.