A new paper suggests that tax cuts that add to the deficit provide little boost to economic growth and may actually hinder it. Last week, the Tax Policy Center (TPC) put out a paper entitled “Effects of Income Tax Changes on Economic Growth,” summarizing the academic literature. According to the authors, Bill Gale from Brookings and Andrew Samwick from Dartmouth, the net economic impact of a deficit-financed income tax cut is either small or negative, with the negative effects of additional debt likely overwhelming the economic benefit of lower rates, particularly over the long term.
Tax cuts have the potential to grow the economy, but their benefit depends on how they are structured and financed. For tax changes to promote growth, changes should encourage work and investment through lower rates, efficiently encourage new economic activity (rather than providing a windfall for previous investments), reduce economic distortions, and create minimal (if any) increases in the budget deficit.
The key question is, how do you pay for tax cuts? If tax cuts are deficit-financed, the negative economic effects of debt will crowd out investment, which can outweigh any positive growth impact from the tax cut. CBO has found that an “Alternative Fiscal Scenario” representing roughly a $2 trillion increase in deficits over ten years would lead to a 7.5 percent smaller economy in 25 years, while a deficit reduction plan of $4 trillion would increase the size of the economy by 2 percent. Increased revenue has been a key part of many bipartisan plans for deficit reduction, including Simpson-Bowles and Domenici-Rivlin.
Importantly, however, the lack of growth from deficit-financed tax cuts is distinct from the effects of either tax reform, which pairs rate reductions with base broadening, or tax cuts that are financed through simultaneous spending reductions to reduce government consumption. Using base broadening to pay for lower rates avoids crowding out other investment, but would likely temper the economic gains because some base broadening can push up effective marginal tax rates on taxpayers who were taking advantage of the closed loopholes.