Now, according to the National Council of Nonprofits, the House GOP's proposed tax plan would discourage people from giving.

While the bill known as the Tax Cuts and Jobs Act promises to provide tax relief and a simpler filing process for businesses and individuals, the group is concerned that those cuts will affect charitable deductions.

The council's president, Tim Delaney, says many middle-class families would be discouraged from itemizing their deductions because they would no longer get a tax break.