26 CFR § 1.61-1 - Gross income.
(a) General definition. Gross income means all income from whatever source derived, unless excluded by law. Gross income includes income realized in any form, whether in money, property, or services. Income may be realized, therefore, in the form of services, meals, accommodations, stock, or other property, as well as in cash. Section 61 lists the more common items of gross income for purposes of illustration. For purposes of further illustration, § 1.61-14 mentions several miscellaneous items of gross income not listed specifically in section 61. Gross income, however, is not limited to the items so enumerated.
(b) Cross references. Cross references to other provisions of the Code are to be found throughout the regulations under section 61. The purpose of these cross references is to direct attention to the more common items which are included in or excluded from gross income entirely, or treated in some special manner. To the extent that another section of the Code or of the regulations thereunder, provides specific treatment for any item of income, such other provision shall apply notwithstanding section 61 and the regulations thereunder. The cross references do not cover all possible items.