[yazmeya]

Though if that 100K to 90K move had actually changed your tax bracket, you'd stand to maybe save a bit more.

[ben-schaaf]

It changes nothing. If you get taxes 20% til 90k and 30% above that, then donating 10k still saves you 3k in taxes, you're still out 7k and you're still paying 18k in taxes on the 90k.