The IGM Forum asks an odd question. Agree or disagree with the statement
Reducing the income-tax deductibility of charitable gifts is a less distortionary way to raise new revenue than raising the same amount of revenue through a proportional increase in all marginal tax rates.
Janet Currie writes
The wording implies that distortion is bad, but the point of the charitable deduction is to encourage charity, ie to “distort” behavior.
Angus Deaton agrees with the statement, but adds
If minimizing distortion is your target, though seems like a very odd one.
In fact, the consensus seems to be that this was not the right question.
For more on the charitable deduction, you might look at this Hudson Institute event.
For me, the difficulty of assessing the charitable deduction concerns the relevant margin. If the relevant margin that it affects is the mix between profits and non-profits, then I would rather see more firms driven by profit. Non-profit to me means not being accountable to consumers, and that is not a good thing. On the other hand, if the relevant margin is the mix between private charity and government-run charity, then I do not think that shrinking private charity to grow government charity is a good idea.