Which of the following items is included in the calculation of Adjusted Gross Income (AGI)?

Adjusted Gross Income (AGI) is a crucial figure on a taxpayer's return that serves as the basis for determining taxable income and eligibility for certain credits and deductions. Capital gains, which represent the profit from the sale of an asset such as stocks or property, are included in the calculation of AGI because they are considered a form of income.

When a capital asset is sold for more than its purchase price, the gain counts as income for tax purposes. This makes it a key component of AGI. All sources of income, with few exceptions, factor into this calculation to provide a complete picture of a taxpayer's financial situation.

In contrast, while rental income is another source of income for taxpayers, it is specifically included in calculations for AGI and is not the answer. Gambling losses, although they can offset gambling winnings for tax purposes, are subject to specific rules that do not allow them to contribute positively to AGI itself. Child support received, on the other hand, is not counted as taxable income and thus does not contribute to AGI. Understanding the inclusion of income types in AGI can help taxpayers accurately assess their taxable income and identify potential deductions or credits that may apply based on their AGI.