What distinguishes operating income from non-operating income?

• A. Operating income comes from core activities; non-operating from incidental activities.
• B. Non-operating income comes from core activities; operating from incidental activities.
• C. Operating income includes taxes; non-operating excludes taxes.
• D. Operating income is always cash-based; non-operating is accrual-based.

Answer: (D)

The main idea is that operating income comes from the business’s ongoing, central activities, while non-operating income comes from peripheral or incidental activities that aren’t part of the core business.

On the income statement, operating income reflects revenue from the principal products or services the company sells and the expenses tied directly to those activities (including things like depreciation that affect ongoing operations). Non-operating income includes items like interest earned or paid, gains or losses from investments, rental income not related to the core business, and other items outside normal operations. These non-operating items are shown separately because they don’t tell you how the core business is performing.

So the best way to distinguish them is that operating income is tied to the central business activities, whereas non-operating income arises from secondary, incidental activities. Taxes and cash versus accrual timing aren’t the defining difference here.