WASHINGTON — A Congressional Research Service analysis suggests there are impediments to broadening the tax base by eliminating or reducing tax expenditures — such as tax-exemption for municipal bond interest — because they are viewed as “serving an important purpose” and are “quite popular” with the public.

The 41-page report published last week detailed some of the costliest tax expenditures in the tax code, including tax-exempt tax-credit bonds, which rank 11 in the top 20 largest individual tax expenditures for fiscal 2014. Tax-exempt tax-credit bonds would amount to $42.7 billion for fiscal 2014, 3.6% of all tax expenditures.

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