It doesn't look like a mistake. The gift still goes through, the charity still says thank you, the deduction still shows up. But funding a donor advised fund with cash when you're sitting on appreciated stock can hand the IRS six figures you never had to pay. Here's the trap, why smart people fall into it, and the simple fix.

People hear "donor advised fund" and picture something complicated, expensive, and reserved for the ultra-wealthy. It's none of those things. Here's the plain-English version — how a DAF works, what it does to your taxes, and the handful of things it's genuinely good (and bad) at.

Most people fund a donor advised fund with cash — the simplest option, and often the most expensive. The asset you choose to give changes both the size of your gift and the size of your tax bill. Here's a plain-English guide to funding a DAF with cash, stock, real estate, or crypto, and how to pick.