Charities say they’re receiving a rush of donations this month ahead of a change to the tax system, The Wall Street Journal reported Saturday.

Some nonprofits and experts fear the new GOP tax plan could lead to a drop in giving once it's implemented.

The standard tax deduction for both individuals and couples will double on Jan. 1, which means fewer Americans will be likely to itemize their taxes. Only those who itemize their taxes can take charitable donations out of their taxable income.

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December is traditionally a major month for giving during the holiday season. But leaders of some charities said they noticed a significant uptick this month.

“This has been the most active December since my time at the community foundation,” Les Garner, the chief executive officer of the Greater Cedar Rapids Community Foundation in Cedar Rapids, Iowa, told the Journal.

“It has been coming in steadily all month, but this last week has been amazing,” he added.

Experts told the Journal that charitable giving is expected to go down overall because of the tax bill, but it’s unclear by how much.

“We don’t know what effect the tax law will have until we see the regulations, but what we fear is that this could have a chilling effect going forward,” Greg Dugard, the associate vice president of development for the University of Notre Dame, told the Journal.

President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE signed the tax bill into law last week, marking the first major legislative victory for his administration.