Oil companies historically worked with Middle East countries to pursuade potentates to change royalties on oil extracted by US companies into taxes. The result was of no consequence to foreign treasuries - they still got the same money - but the impact to the US Treasury was an enormous loss. The cost was not defined any longer as a cost of doing business, an overhead, but by being treated as a "tax" the amounts could be deducted and the companies paid much less to the US Treasury - tens of billions less. Treating taxes by sovereign nations as a cost of doing business, and not as tax, would save the US Taxpayers who billions (unless they are oil companies).
If this is no longer the case according to referenced commentss I'll gladly withdraw the csuggestion.