That's not entirely correct. The spending that is used in those models are current spending figures balanced against tax income (basically the budget).

Now since Trump maintained the deficit at virtually the same point for a year, those numbers are saying essentially that 1.4 trillion dollars will be in the hands of the American people that previously would have been taxed. This also equates to a 1.4t increase in the deficit but only because Trump has stabilised spending vs tax income so far (and I know he won't continue it).

My entire point is that this plan costs 1.4 trillion dollars. You can reword it as many times as you like but the government simply needs this plan to generate 1.4 trillion dollars over a decade to break even.

The JTC also predicts that this plan will generate 400b+ in additional tax from people currently being taxed, the JTCs actual estimates thus are closer to 1 trillion dollars.

And again, this will very easily and quickly be generated from newly taxed foreign investors.

I am yet to be presented with any math that really suggests this won't happen.

Curiously, neither the JTC nor the CBO really discusses this aspect of it which seems rather disingenuous. The entire point of the tax plan is to bring in foreign investment and make America competitive and both happened to omit an analysis of this. It's wrong.