Is Bob required to file a tax return based solely on his income?

Bob's requirement to file a tax return is primarily determined by his income level, as there are specific income thresholds set by the IRS based on filing status and age. If Bob's income exceeds the minimum filing requirement, then he is obligated to file a tax return.

In this context, the assertion that he is required to file based solely on his income is accurate. The IRS establishes these thresholds to ensure that individuals earning above a certain amount report their income and fulfill their tax obligations.

Other factors, such as being claimed as a dependent or having specific deductions, may influence his specific filing situation but do not change the fundamental requirement that filing is based on income levels alone. Thus, the emphasis on Bob's income as the basis for the requirement to file is the correct focus in understanding his tax obligations.