I haven't heard that you're taxed when you lose money. My understanding was that If I invest $10,000 in a taxable account, lose $1,000, and withdraw the remaini

I haven't heard that you're taxed when you lose money. My understanding was that If I invest $10,000 in a taxable account, lose $1,000, and withdraw the remaining $9,000, I won't pay taxes on the $9,0000 (ignoring transaction fees).