Can I take a capital loss on a share of a business that I inherited in 2012 that has decreased in value?

[oph92]

when I inherited the business in 2012 my share of the business was valued at $300,000.  My proceeds on the sale this year will be $100,000.

[tagteam]

You should seek professional guidance for this matter.

Generally, the sale of a business involves the sale of its component parts (e.g., tangible property such as inventory, furniture/fixtures, buildings, land, vehicles, and equipment and intangible property such as copyrights, trademarks, goodwill, agreements not to compete, et al).

If the sale involves (or involved) a group of assets to which goodwill or going concern value attached, then a Form 8594 should be (or have been) filed.

See https://www.irs.gov/instructions/i8594#idm140044360310576