You’re giving hints about your accounting.
So lets run it down: if GM were to sell a billion dollars of goods to Mexico in a year (where does that estimate come from?) what would the EBITA be? Maybe $200M? What about net before taxes? 100M? How much tax would they pay on that? $15M? So based on your hypothetical, what percentage of the annual wall building and maintenance cost would the hypothetical GM taxes be covering?
You already tax companies on their profits.
your yet to tell us how you would reduce the spending by being how much the wall will cost, all your doing is increasing the budget.
He also forget to note that major companies that do business internationally have separate sub companies in those countries (Ford, etc) so they can avoid paying double taxes on those profits.
Not going to happen. The value of the wall as a political prop (both as Donald’s vision and as a means to show how them nasty leftists are blocking it) is more valuable to him than actually constructing the silly thing.