Trusts That Hold S Corporation Stock: ESBTs and QSSTs

If you own S corporation stock, this section outranks most of the chapter, because the wrong trust does not merely cost you tax—it terminates the company’s S election. An S corp may have only certain shareholders, and most trusts are not among them. Fund your ordinary revocable trust with S stock and you are fine while you live (a grantor trust is a permitted shareholder), but that grace period ends two years after your death. If nobody makes an election in that window, the corporation converts to a C corporation retroactively, and every shareholder—your family, your co-founders, people who had nothing to do with your estate plan—gets a surprise corporate-level tax bill and a decade of cleanup. This is the estate-planning mistake most likely to make you unpopular posthumously.

Two elections keep the stock in a trust legitimately:

Qualified Subchapter S Trust (QSST) ( IRC §1361(d))

One income beneficiary, who must be a US citizen or resident, and all trust income must be distributed to them currently. The beneficiary makes the election, within two months and 16 days of receiving the stock, and is then treated as the owner of the S stock—so the corporation’s income is taxed on their personal return at their rates. Choose this when there is a single heir in a lower bracket than the trust and you do not mind income flowing out to them.

Electing Small Business Trust (ESBT) ( IRC §1361(e))

Multiple beneficiaries permitted, income may be accumulated or sprinkled. The trustee elects. The price is real but narrower than it is usually described: under IRC §641(c) the S portion is treated as a separate trust whose ordinary income is taxed at the highest trust rate—a flat 37%, with no graduated brackets, no exemption, and no distribution deduction, so distributing the money does not move the tax to the beneficiary. Note the carve-out, because it is the one that matters: IRC §641(c)(2)(A) applies that flat rate “except as provided in section 1(h),” so the S portion’s net capital gain—including the gain when the company is finally sold—is taxed at ordinary capital gains rates, not 37%. Choose the ESBT when control and creditor protection outrank the rate on operating income: a spendthrift heir, several beneficiaries, or a trust that must accumulate.

For a company you intend to sell, look past the annual rate and check who owns the gain. In an ESBT the sale proceeds are taxed inside the S portion at capital gains rates. In a QSST the answer is counter-intuitive: although the beneficiary is treated as owner of the stock year to year, Treas. Reg. §1.1361-1(j)(8) provides that on a disposition the QSST election terminates as to the stock sold and the gain belongs to the trust, not the beneficiary—so a QSST chosen to push income onto a low-bracket heir does not push the exit gain there too. Model the sale, not just the K-1. The practical instruction is short: if S corporation stock will ever sit in a trust, tell your estate attorney before the trust is drafted, calendar the election deadline against the date of death, and confirm annually that the shareholder list still contains only eligible holders. Late elections can sometimes be repaired under Rev. Proc. 2013-30, but relief costs money and requires that the failure was inadvertent—a defense that gets weaker the longer nobody noticed.