When looking at tax plans, more needs to be considered than just the national debt. That includes the position of the country (a booming economy can afford higher taxes while a slumping economy typically reduces taxes to promote growth) and the effects that those plans will have on growth, investment etc.
Now unfortunately the Tax Policy Center has yet to release an analysis of Trump's updated proposal, however they have released a very in depth and very interesting (are macroeconomics interesting to people?) report on Trump's original tax plan.
A basic summary is that, while tax cuts brought on by spending cuts can increase growth, the large debt that would be incurred due to these plans would largely offset this growth, and because this deficit is unsustainable, necessary future increases in taxes to compensate could leave us in an even worse position than where we started in terms of GNP with a significantly higher national debt.
I doubt that the changes to Trump's tax plan were large enough to counteract these issues, however I will defer judgement until I see further information.







