How much of Miles' total distribution is considered taxable after receiving a total of $30,000?

In the context of determining the taxable portion of a total distribution, the correct answer is based on understanding the tax implications of the different components of Miles' distribution. When an individual receives a total distribution from a retirement account, the entire amount is typically subject to income tax unless it represents a return of after-tax contributions or other nontaxable amounts.

In Miles' case, if he received a total of $30,000 and there are no specifics indicating any nontaxable components or permitted exclusions from the total amount, it is understood that all of it is taxable income. Therefore, the entirety of the $30,000 received is considered taxable.

To clarify further, if there were specific contributions made that had already been taxed (such as Roth contributions), those amounts would be excluded from taxation upon distribution. However, given no such context or exclusions are provided in this scenario, it logically follows that the full amount is taxable income.