I will preface this by saying that 1) I have not read through the entire paper yet; and, 2) it has not been published in a peer-reviewed journal, so you should definitely look into it's methodology and findings yourself, however it's interesting.
Also forgive me if the topic title is a little misleading, the paper finds these results for the parts of the plan that it could assess. Parts of the plan it did not assess as the authors did not have sufficient details about them.
(the first few paragraphs):
This paper examines the tradeoffs among three competing goals that are inherent in a revenue-neutral income tax reformmaintaining tax revenues, ensuring a progressive tax system, and lowering marginal tax rates. As a motivating example, we estimate the degree to which individual income tax expenditures would have to be limited to achieve revenue neutrality under the individual income tax rates and other features advanced in presidential candidate Mitt Romneys tax plan, and how the required reductions in tax breaks could change the distribution of the tax burden across households. (We do not score Governor Romneys plan directly, as certain components of his plan are not specified in sufficient detail, nor do we make assumptions regarding what those components might be.)
Our major conclusion is that a revenue-neutral individual income tax change that incorporates the features Governor Romney has proposed including reducing marginal tax rates substantially, eliminating the individual alternative minimum tax (AMT) and maintaining all tax breaks for saving and investment would provide large tax cuts to high-income households, and increase the tax burdens on middle- and/or lower-income taxpayers. This is true even when we bias our assumptions about which and whose tax expenditures are reduced to make the resulting tax system as progressive as possible. For instance, even when we assume that tax breaks like the charitable deduction, mortgage interest deduction, and the exclusion for health insurance are completely eliminated for higher-income households first, and only then reduced as necessary for other households to achieve overall revenue-neutrality the net effect of the plan would be a tax cut for high-income households coupled with a tax increase for middle-income households.
In addition, we also assess whether these results hold if we assume that revenue reductions are partially offset by higher economic growth. Although reasonable models would show that these tax changes would have little effect on growth, we show that even with implausibly large growth effects, revenue neutrality would still require large reductions in tax expenditures and would likely result in a net tax increase for lower- and middle-income households and tax cuts for high-income households.
It would be possible to reduce the regressivity of such plans or even to maintain progressivity in such plans with reductions in the tax rate cuts for high-income taxpayers and/or significant reductions in the tax preferences for saving and investment, including the preferential rates on capital gains and dividends.
http://www.brookings.edu/research/papers/2012/08/01-tax-reform-brown-gale-looney
Thoughts? What I find particularly interesting is that even after controlling for generous growth effects, the main results still hold.
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