21.1 S Election Requirements (Form 2553)
Key Takeaways
- S corporations elect S status by filing Form 2553 with all shareholders consenting.
- Must be a domestic corporation with no more than 100 shareholders (family-aggregation rule allows 6-generation family to count as one).
- Only one class of stock is permitted (voting differences allowed).
- Shareholders must be individuals (US citizens or residents), estates, or certain trusts (no partnerships, C corps, or NRAs).
- For Tax Year 2025 effectiveness on a calendar year, Form 2553 must be filed by March 17, 2025 (or any time during 2024).
- Late election relief is available with reasonable cause under Rev. Proc. 2013-30.
Why This Matters for the Exam
S corporation eligibility requirements are heavily tested on Part 2. The exam tests the specific requirements, filing deadlines, and what can disqualify a corporation from S status.
Exam Note: For the July 1, 2026 - February 28, 2027 testing window, you are tested on S corporation rules as of December 31, 2025 (Tax Year 2025). OBBBA did not change Subchapter S eligibility rules, but it made QBI (§199A) permanent and reset EBL (§461(l)) permanently — both affect S corp shareholders.
Expect at least 4-5 questions on S corporation eligibility.
What Is an S Corporation?
An S corporation is a corporation that elects to pass corporate income, losses, deductions, and credits through to its shareholders for federal tax purposes.
| Feature | S Corporation |
|---|---|
| Taxation | Pass-through (no entity-level tax) |
| Legal structure | Corporation (limited liability) |
| Double taxation | Avoided |
| Best for | Small businesses with U.S. individual owners |
Eligibility Requirements
To elect S status, a corporation must meet all of the following:
| Requirement | Detail |
|---|---|
| Domestic corporation | Organized in the U.S. |
| 100 shareholders maximum | Family members can count as one |
| One class of stock | Voting differences allowed |
| Eligible shareholders only | Individuals, estates, certain trusts |
| No ineligible shareholders | No partnerships, corporations, NRAs |
The 100-Shareholder Limit
| Rule | Description |
|---|---|
| Maximum | 100 shareholders |
| Family rule | All members of a family (6 generations) can elect to count as one shareholder |
| Spouses | Count as one shareholder |
| Estates | Count as separate shareholders |
One Class of Stock Rule
| Permitted | Not Permitted |
|---|---|
| Common stock with voting rights | Preferred stock |
| Common stock without voting rights | Different distribution rights |
| Different voting rights only | Different liquidation rights |
Key Point: All shares must have identical rights to distributions and liquidation proceeds. Voting differences are okay.
Eligible Shareholders
| Eligible | Ineligible |
|---|---|
| U.S. citizens and residents | Non-resident aliens (NRAs) |
| Decedent's estates | Partnerships |
| Bankruptcy estates | Corporations |
| Grantor trusts | LLCs taxed as partnerships |
| Qualified Subchapter S Trusts (QSSTs) | Foreign trusts |
| Electing Small Business Trusts (ESBTs) | Tax-exempt organizations (most) |
Form 2553 Filing Deadline
| Scenario | Filing Deadline |
|---|---|
| New corporation | Within 2 months 15 days of formation |
| Existing corporation (calendar year) | March 15 for current year effectiveness |
| Prior year election | Any time during the prior tax year |
For Tax Year 2025 Calendar-Year Corporation:
- File Form 2553 by March 17, 2025 for 2024 effectiveness.
- Or file any time during 2024 for 2024 effectiveness.
All Shareholders Must Consent
Every shareholder must sign Form 2553 or a separate consent statement.
| Situation | Requirement |
|---|---|
| All shareholders | Must consent |
| Community property | Both spouses must consent |
| New shareholders | Need not re-consent (bound by election) |
Late Election Relief
The IRS grants relief for late-filed Form 2553 if:
| Requirement | Description |
|---|---|
| Reasonable cause | Failure was inadvertent |
| Timely returns | Corporation filed returns consistent with S status |
| Intent | Corporation and shareholders intended S election |
Revenue Procedure 2013-30 provides automatic relief if filed within 3 years 6 months.
Real-World Scenario
Scenario: A corporation formed on January 15, 2025, wants S status for 2024. When must Form 2553 be filed?
- Deadline: Within 2 months 15 days of formation = March 31, 2025.
- All shareholders: Must sign Form 2553.
- If missed: Apply for late election relief under Rev. Proc. 2013-30.
On the Exam
Expect 4-5 questions on S election, typically:
- Shareholder Limit Questions: "What is the maximum number of shareholders?"
- Eligible Shareholder Questions: "Which entity CANNOT be an S corp shareholder?"
- Stock Questions: "What stock differences are permitted?"
- Deadline Questions: "When must Form 2553 be filed?"
The key is to remember: 100 shareholders max. One class of stock (voting differences OK). Only individuals, estates, certain trusts. No partnerships, corporations, or NRAs.
What is the maximum number of shareholders an S corporation can have?
Which of the following is NOT an eligible S corporation shareholder?
For a calendar-year corporation to have S status effective for Tax Year 2025, by what date must Form 2553 be filed?