The type of shenanigans you have suggested as a means of increasing expenses are what tax practitioners call "tax evasion schemes"
There's a distinction between tax avoidance and tax evasion, and most of what companies do to (very successfully) avoid paying tax is tax avoidance (i.e. perfectly legal).
There's a distinction between tax avoidance and tax evasion, and most of what companies do to (very successfully) avoid paying tax is tax avoidance (i.e. perfectly legal).