Election Risk
S Corp Eligibility: The Six Cliffs That Can Kill Your Election
An S-Corp election is fragile. One wrong shareholder, one preferred share issuance, one foreign-owner trust, and your corporation reverts to C-Corp tax treatment, potentially retroactively. This page covers the six cliffs and how to avoid them.
Updated 17 April 2026 · Sources: IRC Section 1361, Rev Proc 2013-30, IRS Form 2553 instructions
One wrong shareholder, one preferred share issuance, one foreign-owner trust, and your corporation reverts to C-Corp tax treatment. That reversion can be retroactive to the start of the tax year, turning a pass-through year into a C-Corp year and creating a significant unexpected tax liability discoverable years later in due diligence.
The 100-Shareholder Cap
IRC 1361(b)(1)(A) · Risk: medium
An S-Corp cannot have more than 100 shareholders. All members of a family (common ancestor, descendants within six generations, and their spouses) can elect to be treated as a single shareholder under IRC 1361(c)(1). This family-count election can extend the effective cap significantly for family-owned businesses. However, adding outside investors without tracking the count can accidentally bust the election.
Annual checklist item
Count shareholders annually. Track family-member election status. Flag any issuances that would push the total above 90 as a warning threshold.
US Individuals Only
IRC 1361(b)(1)(C) · Risk: high
Shareholders must be US citizens or US residents. Non-resident aliens cannot own S-Corp stock. Corporations, partnerships, and most other entities cannot own S-Corp stock. The only entities that can hold S-Corp stock are: estates, certain trusts (see Cliff 4), and other S-Corps (as a direct subsidiary under a QSub election).
Annual checklist item
Verify residency status of all shareholders at each issuance. Red flag: shareholder moves abroad or visa status changes. Confirm at year-end.
Single Class of Stock
IRC 1361(b)(1)(D) · Risk: high
Only one class of stock is allowed. The class must give all shares identical rights to distribution and liquidation proceeds. Voting differences are permitted (voting vs non-voting common shares are allowed). Preferred stock, shares with different distribution rights, or economic arrangements that effectively create different classes (e.g., guaranteed payments, disproportionate distributions) all bust the election. Convertible debt and options/warrants can create constructive second classes of stock under the Treasury Regulations.
Annual checklist item
Before issuing any equity or debt with conversion features, confirm no second-class-of-stock issue is created. Review any profit-sharing or distribution agreements.
Eligible Trust Types Only
IRC 1361(c)(2) · Risk: medium
Only specific trust types can hold S-Corp stock: grantor trusts (during life + 2 years after death), Qualified Subchapter S Trusts (QSST), Electing Small Business Trusts (ESBT), voting trusts, and certain testamentary trusts. Common mistakes: transferring shares to a family limited partnership acting as a trust, or to a charitable remainder trust, or to a foreign trust. The QSST and ESBT elections must be properly filed; failure to file timely terminates the trust's eligibility.
Annual checklist item
Before transferring shares to any trust or estate vehicle, confirm the trust type qualifies. File QSST or ESBT elections timely.
No Ineligible Corporation Types
IRC 1361(b)(2) · Risk: low
Certain corporation types cannot elect S status: banks that use the reserve method of accounting for bad debts, insurance companies subject to Subchapter L, possessions corporations under Section 936, and Domestic International Sales Corporations (DISCs). This cliff matters primarily for financial services companies.
Annual checklist item
Confirm the corporation type is not in an excluded category before filing Form 2553.
Passive Income Trap (Former C-Corps Only)
IRC 1362(d)(3) · Risk: medium
Applies only to S-Corps that were formerly C-Corps with accumulated Earnings and Profits (E&P). If passive investment income (interest, dividends, rents, royalties, annuities) exceeds 25% of gross receipts for three consecutive tax years AND the corporation has accumulated C-Corp E&P, the S election automatically terminates at the end of the third consecutive year. The fix is to distribute the accumulated C-Corp E&P (triggering dividend tax) before the third consecutive year.
Annual checklist item
Track C-Corp E&P separately from S-Corp AAA. Monitor passive income ratio annually. Distribute E&P if approaching the three-year trigger.
Inadvertent Termination Relief (Rev Proc 2013-30)
Under IRC 1362(f), the IRS routinely grants automatic relief for inadvertent S-election terminations if four conditions are met:
- The termination was inadvertent (not tax-motivated)
- The corporation takes corrective action within a reasonable time after discovering the issue
- The corporation and all affected shareholders agree to be treated as if the election never terminated during the inadvertent termination period
- For automatic relief (no PLR required): the termination was due to one of the specifically listed causes in Rev Proc 2013-30 and the taxpayer acts within three years and 75 days of the termination date
Automatic relief is available without a private letter ruling for most inadvertent terminations under Rev Proc 2013-30. Apply as soon as you discover the issue. Write “FILED PURSUANT TO REV PROC 2013-30” at the top of the corrective Form 2553 filing.
Discovery in Due Diligence
Acquirers' tax counsel routinely check for S-election defects in M&A transactions. A terminated S election discovered in due diligence typically requires: (1) an adjustment to the purchase price, (2) an indemnity escrow for the potential tax liability of the C-Corp year(s), or (3) transaction restructuring. The reputational and financial cost can be significant relative to the SE-tax savings from the S election. Annual eligibility checks are cheap insurance.