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The Daily Insight

Is the sale of C Corp stock subject to NIIT?

Author

Henry Morales

Published Apr 11, 2026

For C corporation shareholders, the NII tax applies to any dividends paid by the corporation and to any gain on the sale of the C corporation stock. The level of a C corporation shareholder’s participation in the corporation’s business is irrelevant for purposes of the NII tax.

Are C corporations subject to net investment income tax?

Section 1411 applies to dividends received by a shareholder of a C Corporation. Section 1411(c)(1) generally provides that dividend income received by an individual taxpayer from a C corporation is net investment income unless such income is derived in the ordinary course of a trade or business.

Do you have to pay taxes on sale of C Corp stock?

The corporation will have to pay 21% on the gains, but the shareholder, when they receive the remaining sale proceeds through a liquidating dividend, can use Sec. 1202 to avoid tax on that cash. The overall tax effect is closer to that of an asset sale by an S Corp or LLC.

What kind of tax return do you need for a C corporation?

Corporate tax returns require Form 1120. Businesses listed under C corporation face the possibility of double taxation, where dividend income is distributed to owners, also considered is personal income. Tax on capital gains is a serious consideration when incorporating a business.

Can a C corporation file as a S corporation?

In fact, all corporations are C corporations (under subchapter “C” of the tax code) unless they file for S corporation status. If you take no action to elect S corporation tax treatment from the IRS, your corporation is a C corporation.

What are the downsides of owning shares in a C corporation?

The major downside of owning shares in a C corporation for officers, is that taxation of those business earnings is double. The IRS requires C corporations to file business income tax reports, including record of apportionment. Income after business expense and salary deductions is subject to tax.