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I get that too from time to time and I feel like it happens if I have a referral cookie set or arrived from a direct referral link and added an item to my cart.

The half a percent they give your charity is less than the referral commission.

Overall I am very happy to be able to passively support my charity of choice this way.

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And it’s probably tax deductible

Aren't all business expenses tax deductible?

I’d say the deduction would be claimed by Amazon, and the IRS wouldn’t allow the customer to claim it. And as a sibling commenter mentioned, for businesses it doesn’t matter if it’s a charitable donation or business expense.

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