Total gifts from individual donors are rising, at least for now.
Here are five ways the Treasurer could boost revenue to make the numbers work.
The nation's biggest gun advocacy group operates as a bundle of distinct organizations. It's a fairly common arrangement, followed also by the likes of Planned Parenthood and the ACLU.
The lost incentives to give are likely to make a bigger difference than the small uptick in economic growth expected from the new law.
More than US$20 billion per year in giving is potentially at stake.
If Americans become less healthy and have less access to health care, then everyone loses.
Republicans rewriting the tax system have a rare opportunity to fix a major problem: most women-owned companies can't take advantage of key provisions designed to help small businesses like theirs.
With some tinkering, a federal tax credit that encourages developers to create new units that low-income Americans can afford to rent might yield other benefits.
The tax changes Trump and GOP lawmakers propose would reduce charitable giving, research suggests. But letting everyone use a tax break mostly enjoyed by the rich might prevent that.