"I am not 100% sure, but I don't believe that offering a game in a bundle that also supports charity allows for a deduction. Since they are still technically selling the game it would not count as an in-kind contribution. I also assume that Humble would only deduct the amount allocated to charity from their tax liability since it is not actually their income. Outside of bundles, there are some definite issues with what can qualify as a 501(c)3 and how corporations can use them to limit their tax liability." - Kevin Bondelli