Here I mention one other problem with the Trump tax proposal, besides its potential to increase economic inequality by favoring the wealthy. The Tax Policy Center estimates that it would “reduce federal revenues by $2.4 trillion over the first ten years and $3.2 trillion over the subsequent decade.” Without offsetting cuts in federal spending, it could add hundreds of billions to annual deficits and trillions to the national debt.
The question of how tax cuts influence deficits and the debt is complicated by their uncertain effects on economic growth. If the rate of growth goes up, incomes should rise, and taxes on those incomes should bring in additional revenue. Back in 1974, University of Chicago economist Arthur Laffer proposed that a tax cut can actually pay for itself by stimulating growth, while a tax increase can actually reduce revenue by inhibiting growth. This has become a popular argument for tax cuts, despite the weakness of the evidence supporting it. The big tax cuts under Ronald Reagan and George W. Bush did not pay for themselves, but contributed instead to soaring budget deficits.
Tax analysts have two different ways of evaluating the impact of tax changes on revenue. Conventional scoring makes no assumptions about the effects of the changes on economic growth. Dynamic scoring tries to incorporate an estimate of those effects (known as “macroeconomic feedback effects”) into the prediction model. The Tax Policy Center said this in their first evaluation of the Trump plan:
This report uses conventional scoring methods that assume the tax proposals do not affect the overall level of economic activity. TPC will release supplemental estimates that include macroeconomic feedback effects soon. Based on TPC and the Penn Wharton Budget Model’s analyses of the macroeconomic effects of the House Republican leadership tax blueprint of 2016 (which shares many characteristics with the [Trump] unified framework), we would expect the framework to have little macroeconomic feedback effect on revenue over the first decade.
Translation: Revenue losses might be a little offset by economic growth effects eventually, but don’t hold your breath.
The Trump economic team has been vigorously promoting the idea that the tax cuts will pay for themselves. They seem to be reading from a familiar Republican playbook: Dismiss concerns about the deficit when calling for tax cuts. Then when the deficit goes up, blame federal spending rather than tax policy. Issue dire warnings about bankrupting future generations and call for cuts in programs that primarily help the middle class and the poor. According to the Republican Party line, the country can always afford another tax cut aimed mainly at the wealthy. What it can’t afford is programs like Medicaid or Obamacare to help people pay for health care.
That the current administration would play the same game is disappointing, considering how much Donald Trump has marketed himself as a champion of the working class. His positions on immigration, foreign trade and race do appeal especially to less educated voters. But on fiscal policy, his thinking seems very much in line with the Republican establishment, favoring tax cuts for the wealthy and spending cuts for the poor. He is very good at hiding his real aims behind a populist, pro-worker, pro-growth rhetoric. So far, most of his supporters are sticking with him, even as he sticks it to them with his economic policies.