Business Income and S Stock

Business income

• A trust or estate that operates a business reports it on the 1040 Schedule C or F attached to the 1041. There is no self-employment tax — §1401 reaches only individuals — so the estate that continues the decedent’s Schedule C business pays income tax alone. Business expenses are above the line. A trust formed to carry on a business, however, is classified under check-the-box as a partnership or corporation (Reg. §301.7701-4(b)); only a trust whose purpose is to protect and conserve property for beneficiaries is taxed under Subchapter J. A liquidating trust with a short fixed term holding cash and short-term paper stays a trust (Reg. §301.7701-4(d); Rev. Proc. 82-58).
• Inherited business assets take a §1014 basis and restart depreciation on the regular tables with a short first year; no bonus (acquired from a decedent); no §179 (never for a fiduciary). Form 8971 Schedule A controls the basis where a 706 was required.
• The passive activity rules apply to trusts and estates. Material participation is measured by the trustees’ work under the seven tests of Reg. §1.469-5T(a) (500 hours; substantially all the participation; more than 100 hours and not less than anyone else; significant participation activities over 500 hours; five of the last ten years; personal service activity three years; facts and circumstances over 100 hours). The decedent’s participation before death does not count. The IRS position: only work done in a fiduciary capacity counts (TAM 201317010). The Tax Court: trustees who also work as employees of the trust’s business count, and a trust can qualify as a real estate professional (Frank Aragona Trust, 142 T.C. 165 (2014); Mattie K. Carter Trust, N.D. Tex. 2003). Unresolved: a trust with hired managers and a passive trustee.
• Material participation matters twice: the loss is not passive, and the income is not net investment income for the 3.8% tax.
• Rental real estate: an estate gets the $25,000 active-participation allowance for tax years ending within two years of death if the decedent actively participated (§469(i)(4)), and a §645 trust rides along; an ordinary trust never gets it, though it can be a real estate professional under Aragona.
• Suspended passive losses on an interest the fiduciary distributes in kind are added to the beneficiary’s basis in the interest and are never deducted (§469(j)(12)). Course Example 2.15: a $10,000-basis interest with $3,000 of suspended losses goes out at $13,000; the loss is gone. Sell before distributing if the loss is worth more than the basis.

K-1s the fiduciary receives

• A partnership or S corporation K-1 is reported for the entity’s year ending within the fiduciary’s year. The fiduciary’s share of the entity’s depreciation is treated as its own if separately reported.
• Losses pass the basis, at-risk (Form 6198) and passive (Form 8582) gates in that order. The fiduciary tracks its own basis in the partnership interest from the §1014 value less the IRD component (Reg. §1.742-1) and asks about a §754 election; S stock basis starts at date-of-death value.
• The deceased partner’s or shareholder’s share of income through the date of death is on the decedent’s final return (or is IRD to the estate for a partnership, Reg. §1.742-1); the entity’s year closes as to the decedent (§706(c)(2)(A); §1377(a)).
• Accounting income from a pass-through is the cash distributed, not the K-1 income (UPIA §401) — the mismatch on the Three Incomes page.

S corporation stock in a trust or estate

• Eligible shareholders (§1361(b)(1)(B), (c)(2)): a decedent’s estate, for as long as administration lasts (an unduly prolonged estate is recharacterized as a trust — Reg. §1.641(b)-3 — and may then be ineligible); a trust under a §645 election, during the election period; a 100% grantor trust owned by one U.S. individual; a testamentary trust and a former grantor trust after the grantor’s death, for two years from the transfer or death; a voting trust; a QSST; an ESBT. A bypass trust for the decedent’s spouse is not eligible unless it qualifies and elects as one of these (exam Q9).
• QSST (§1361(d)): one income beneficiary during her life; corpus only to her; all income distributed currently; the trust ends at her death or distributes everything to her. The beneficiary, not the trustee, elects within two months and 15 days of the transfer; the election binds successor income beneficiaries. She is taxed on the S items under §678 as if she owned the stock, including gain on the trust’s sale of it.
• ESBT (§1361(e), §641(c)): any number of individual, estate or charitable beneficiaries; sprinkle powers allowed; no interest may have been purchased. The trustee elects. The S portion is a separate trust taxed at the top 37% rate on its share of S items (capital gains at 20%), with no exemption, no distribution deduction, and its items excluded from the rest of the trust’s DNI; write “Sec. 641(c)” beside the Schedule G total. updated 2026 The S portion may now take §642(c) charitable deductions under the individual rules (2017 act). NIIT is computed on the reassembled trust (Reg. §1.1411-3(c)).
• Late QSST and ESBT elections are fixed under Rev. Proc. 2013-30 within three years and 75 days with reasonable cause; after that, a ruling under §1362(f) for inadvertent termination. The mechanics are on the late S election page; the client-facing warning is on estate planning mistakes.
• Planning line for the desk: when a revocable trust holding S stock becomes irrevocable at death, the two-year clock starts. Calendar it. The §645 election buys the election period; the QSST or ESBT election must be in place before the two years run.

Study questions 5 and 6

• SQ 5. Aragona (2014): a trust can be a real estate professional; trustees’ work as employees counts; the IRS trustee-only position was rejected.
• SQ 6. A QSST has one income beneficiary, corpus only to her, all income distributed, and the beneficiary makes the election within 2 months and 15 days.

Private reference, not client advice. Notes taken from two continuing-education courses: Form 1041: A Practical Guide (Hadges & Zollars, Thomson Reuters Checkpoint Learning, 10 hours, written on 2019 law) and Taxation of Trusts, Estates, and Decedents (DeScherer & Rodda, CeriFi, 2025 printing on 2024 law). Figures and rules brought current to 2026 in October 2026 (P.L. 119-21, Rev. Proc. 2025-32, T.D. 9918). Items tagged check are to be confirmed against primary sources before they are relied on.