Now, let's go back and look at your earlier statement, Steve:
You can have an item of gross income from section 61, have no deductions or use Part III and it still won't be "taxable income". I'm not talking about income that can be taxed but isn't because of deductions or exemptions, I'm using the term as in it can't be taxed, like that used in section 63.
(bolding added).
Again, in the bolded material, you incorrectly focus on "section 61" without considering the rest of the law, such as Part III.
Example: Life insurance proceeds received by reason of the death of the insured.
If you looked only part of section 61 without considering the rest of the Code (and without considering the first seven words of subsection (a) of section 61), then this item would be includible in gross income. However, because of section 101, it's not includible in gross income.
If you have an item that is includible in gross income UNDER ALL RELEVANT LAWS (not just section 61), then by definition there is nothing that EXCLUDES that item from gross income. In fact, that's just two ways of saying the same thing.
If something is theoretically includible in gross income under section 61 (without considering the rest of the law), then there is no way you can get from THAT down to a "zero taxable income" amount without either having some exclusion in some law somewhere (such as Part III or section 911) for that amount OR you having to take some sort of "deduction" under the law (meaning a deduction for expenses, or standard deduction, personal exemption deduction, or whatever).
"My greatest fear is that the audience will beat me to the punch line." -- David Mamet