Only individuals who are U.S. citizens or U.S. residents can own S corporation stock. If you aren't a U.S. citizen or resident, you can't own any. Corporations, partnerships and most trusts are also excluded from ownership in S corporations. Estates, nonprofits and a few types of trusts – including grantor trusts, electing small business trusts, and qualified Subchapter S trusts – are permitted to own stock in the company without jeopardizing its status as an S corp.
Number of Owners
Unlike C corporations, which can have thousands or even millions of owners, S corporations cannot have more than 100 owners. Originally, S corporations were limited to just 35 owners but that limit rose to 75 and eventually to 100 shareholders as of 2012. Generally, each person or entity that owns one share or more is counted as one shareholder. However, family members can elect to be treated as one shareholder for meeting the 100-shareholder limit.
Types of Stock
S corporations can issue only one class of stock. The only permissible difference between one share of stock and another is the voting rights. This could mean that certain shares receive extra voting rights, such as five votes per share for certain shares, or that some stock doesn't have any voting rights. However, if the shares have any other differences, the company is deemed to be in violation of the one-class restriction.
Consequences of Violations
Violating any of the S corporation stock regulations nullifies the S corporation election. When this occurs, the company reverts to being a C corporation for income tax purposes, meaning that the income no longer gets reported on the shareholders' individual tax returns. Instead, the company must pay the corporate tax, and then distributions to shareholders are taxed as dividends. For example, if the company grants rights to certain shareholders to get their money out ahead of the other shareholders, also known as a liquidation preference, the company has created a second class of stock. As a result, it loses its S corporation status and becomes a C corporation.