AEI Economic Perspectives paper on how the Tax Cuts and Jobs Act affects household charitable giving in the United States. They found that the law will reduce charitable giving by $17.2 billion (4 percent) in 2018 according to a static model and $16.3 billion assuming a modest boost to growth. Four-fifths of this decline is driven by an increase in the number of taxpayers who claim the standard deduction. They also investigate two policy options that could boost total giving above previous levels; an above-the-line deduction and a tax credit.
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