That's the IRS calling it an income tax. Further, when you pay, or file for a return, what has been withheld goes toward what you owe, or will get back.
Another thing. If you're paying tax, by way of a capital gain tax, on what you make for income, that's your income tax. That's out of wack and needs to be revised. You can't have people like my brother, who made over a million a year, paying his income tax at the low capital gains rate. It's bullshit.
BSB