The Urban Institute has released a fact sheet showing the effects of the American Taxpayer Relief Act of 2012 on charitable giving. According to the Institute, the major individual income tax provisions are estimated to increase giving by $3.3 billion or 1.3 percent, relative to 2012 law, mainly due to the increase in the top marginal tax rate.

A Summary of Relevant Provisions along with the Institute’s Estimated Impact on Charitable Giving can be found here.