We examine how taxes affect donations given to nonprofit organizations and how this varies across nonprofit types. Most prior studies constrained tax price elasticities to be constant across nonprofits, primarily because the data do not provide donations by nonprofit type. Using nonprofit-level data and average marginal tax rates that vary across years and states, we estimate tax price elasticities by nonprofit type. We find an aggregate public charity elasticity of approximately −1.0 and a private foundation elasticity of approximately −2.0. These results suggest that the cost of the charitable contribution deduction is roughly proportional to its benefit for public charities, but that the deduction stimulates significant giving for private foundations. When we partition our elasticities across 24 public charity types, we find significant elasticities of −1.0 or larger for six types. This result suggests that the effect of the charitable contribution deduction varies significantly across nonprofit types.

Prior research finds that donors reward nonprofits that report larger program ratios with more donations and that program ratios frequently are subject to intentional manipulation as well as unintentional errors. We examine how donors react to low-quality ratios. We find that the average donor discounts ratios that are inflated by only the simplest and most observable of methods. We then examine the effect of financial data availability on the average donor's ability to unravel inflated ratios by using the historical shift in data availability that occurred in 1997 and 1998. We find that donors began to discount ratios only after 1998. Finally, we examine whether the discount applied to program ratios varies across donor sophistication (measured as the percentage of fund balances with restrictions) and find that sophisticated donors apply incrementally larger discounts to inflated ratios and discount ratios that are inflated by more complex methods.