“If the tax incentive [for charitable giving] goes away, people will still undoubtedly give to charity, said Alex Brill, research fellow at AEI who published the findings. The AEI model accounts for it. But gifts from wealthy donors could decrease significantly. ‘There’s consensus that the tax break definitely matters. People are always going to quibble about the exact magnitude of the impact,’ Brill said, citing end-of-the-year giving as one example.