Technically if you do that, you don't have to pay any tax, but the tax authorities would immediate judge this as an attempt to bypass taxes and you would be ordered to pay the tax doubled. This applies to practically all laws and the ways that courts interpret them. Most Americans probably think this is stupid, since they see possible abuse. However, this hasn't materialized in Finland.
In the US, the scenario you described would be called tax evasion and you would be charged by the IRS. Even in Finland, I am sure there are illegal ways to do things and legal ways to do things. Surely, every time you buy something from the store you aren't charged for larceny because it is illegal to steal and you circumvented that law!
Technically, what BP is doing is legal under the law. The correct solution, if the US doesn't like it, is to change the law.
In the UK it would be "tax avoidance" if it did not break any law. members of parliament would wring their hands and call "shame" - then do the same things themselves. -- ~~~~