I'm Anne. I've been preparing taxes for 27 years and I'll be happy to help you.
Although you get to write off the charitable deduction $ for $ on Schedule A ( https://www.irs.gov/pub/irs-pdf/f1040sa.pdf) up to 50% of your AGI, when you apply Schedule A to your AGI, what your TRUE benefit is is the tax $ amount you would have paid on that income had it not been donated.
So, for example, you are in the 28% tax bracket, and you donate $10,000 to charity, your actual savings in tax $ is 28% of the $10,000 or $2800
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