For me, the Objectively Correct Amount To Donate is the maximum I can deduct. I think this is 33% of gross, but someone elsewhere said it may be up to 50%. I'd go research it, but right now I'm working on achieving that 33$ this year--I'm not hitting 50% unless I bump up my income a good bit.
But it's an objective measure externally set for me that is neither 0% or 100% (less the minimum needed to live), so I find it quite helpful.
(I think taxes are great and I think we should all pay more to fund education, research, health care, and social safety nets, but right now a good portion of it goes to arresting people for drug use, killing people in the Middle East, breaking the Internet, and other things I really dislike.)
33% is way more than most people donate, so congratulations!
I would nitpick that the maximum amount you can deduct is set by the government, and thus somewhat arbitrary, and certainly not Morally Objective. However, it is objective to you, the individual, and thus makes a very good Schelling point, and you are finding it helpful, so excellent, good for you.
I also largely agree with your statement regarding taxes, and have nothing to add to it at this time.
But it's an objective measure externally set for me that is neither 0% or 100% (less the minimum needed to live), so I find it quite helpful.
(I think taxes are great and I think we should all pay more to fund education, research, health care, and social safety nets, but right now a good portion of it goes to arresting people for drug use, killing people in the Middle East, breaking the Internet, and other things I really dislike.)