If you won a billion. After tax would be around $600m +- depending on state. If you donated 99%, you’d have about $6m left.You’d honestly be better off taking the $600m investing it and giving some of that to charity each year and then the rest when you die. That’s not counting the fact most charities, if not nearly all, are extremely inefficient and wasteful at best.
I would want to learn the most tax efficient ways to do the following:
Give 10% to my church and highly rated Christian ministries
Give four adult members of my family large gifts in lump sums so that they would be set for life and could retire, travel, buy new houses and cars or whatever they wanted to do immediately. None are the type blow through money.
Set up trusts for a minor niece and nephew
Invest a large chunk for myself so that I would be financially covered for life
Use whatever is left to fund medical care that people need but can’t afford, in such a way that the money would go directly for the care. Don’t want to fund lots of “charity” bureaucrats and middlemen.