Suppose I have $9M (million dollars) in net gain resulting from the sale of long-term securities (stock and bond funds).
Can I still assume the maximum federal tax rate is 15%?
Or does the size of the net gain result in a higher tax rate, e.g. 39.6%, due to AMT or other special calculations?
I know: if I had $9M, I could afford to pay a tax professional to answer the question. But this is just a mental exercise. I'm just curious.