My minimum costs are not stable presently (moving, new job soon), so it is difficult to project. But I spend less than $20,000/year on housing, food, utilities/internet/phone and clothing. $10,000/year might be a reasonable buffer for health, trips, etc.
Donating is also a very narrowly defined definition of altruism and it's a bit sad that the effective altruism community has latched onto it as a measure. I believe that if you can move a lot more resources through other actions (research, politics, etc.), that swamps any effect of personal donations. So, my donation plans also include time. Not leisure time (as in the other question asked later), but full-time work time.
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