The Paper Trail

Estimated tax

• Trusts follow the individual rules (§6654(l)). Required when $1,000 or more will be owed after credits and withholding; four installments due the 15th day of the 4th, 6th and 9th months and the 1st month after year end (fiscal years follow the same pattern); penalty on Form 2210 at the individual underpayment rate.
• Safe harbors: 90% of the current year, or 100% of the prior year’s tax (110% if prior-year AGI exceeded $150,000). The prior-year safe harbor requires a prior year of a full 12 months and a return filed for it — so a new trust has no prior-year safe harbor in its first two years and must hit 90% or annualize (Study Question 22). The prior-year-zero exception requires only a 12-month prior year.
• Annualization: the periods for a trust or estate end one month before each installment date (§6654(l)(4)) — the “45 days” in the second course is a loose paraphrase. Notice 87-32 lets a simple trust annualize its distribution deduction and a complex trust use actual or prorated distributions.
• Estates, and trusts receiving the residue of an estate under §645, owe no estimated tax until the first tax year that ends two or more years after the date of death (§6654(l)(2)). Example 8.1: death October 23, 2019, September year → estimates begin with the year ending September 30, 2022.
• Final year: the §643(g) election on Form 1041-T moves the trust’s payments to the beneficiaries — The Termination Year.
• Colorado: DR 0105EP vouchers for fiduciaries; Colorado follows the federal requirement and the federal exemptions check.

Penalties

• Failure to file (§6651(a)(1)): 5% of the unpaid tax per month or part, to 25%; if more than 60 days late the minimum is the lesser of the tax or updated 2026 about $525 for returns due in 2026 (course: $210) check. Fraudulent failure to file: 15% per month to 75%. Failure to pay (§6651(a)(2)): 0.5% per month to 25%; the combined monthly rate is capped at 5%.
• K-1 penalties (§§6721, 6722): per statement not filed with the IRS and per statement not furnished to the beneficiary, updated 2026 about $340 each for 2026, doubled with no cap for intentional disregard check.
• Accuracy (§6662): 20% of an underpayment attributable to negligence or a substantial understatement — for a trust or estate, an understatement exceeding the greater of 10% of the correct tax or $5,000. Reasonable cause and good faith is the defense; “reasonable possibility of success” is not the standard. Disclosure on Form 8275 protects a position with a reasonable basis. The 20% consistent-basis penalty (§6662(b)(8), (k)) applies to a beneficiary who claims basis above the Form 8971 value — only where a 706 was required; a portability-only 706 does not trigger the regime.
• The extension does not extend payment; interest runs from the original due date regardless.

Assessment, refunds and mitigation

• Assessment (§6501): three years from filing; an early return is deemed filed on the due date, a late return starts the clock on the day filed. Six years where gross income is omitted by more than 25% — and an overstatement of basis counts as an omission for returns open after July 31, 2015 (reversing Home Concrete). No limit for fraud or for a return never filed: a trust whose trustee never filed because “there was no income” has no statute at all. Form 872 extends by consent. K-1 items run on the beneficiary’s statute, not the trust’s.
• Prompt assessment (§6501(d); Form 4810): the executor or trustee may request assessment within 18 months of the request, for returns already filed (the decedent’s and the estate’s income and gift tax returns; not the 706). It can shorten a statute, never extend one. Discharge (§6905; Form 5495) added 2026: after the returns are filed the fiduciary may request discharge from personal liability for the decedent’s income and gift taxes; nine months without notice of an amount due and the fiduciary is released. Both belong in every estate’s closing checklist, because the executor is personally liable for the decedent’s and the estate’s unpaid tax to the extent of what he distributed (§6901; 31 U.S.C. §3713).
• Refund claims (§6511): within three years of filing or two years of payment, whichever is later. Exam Q45: filed and paid April 15, 2020 → claim by April 15, 2023. Carryback claims within three years of the loss year’s due date; seven years for bad debts and worthless securities. Form 1045 for a quick carryback refund where a carryback is still allowed.
• Mitigation (§§1311–1314): where a trust or estate and a beneficiary, a grantor and a trust, or a decedent and an estate have treated the same item inconsistently and one year is closed, the statute reopens for a correlative adjustment. Course Example 9.4: an estate that forgot a $20,000 distribution deduction recovers after its statute closed when the IRS taxes the beneficiary on the same $20,000.

Form 7004, in detail

• Automatic 5½ months (Surface Transportation Act of 2015) — September 30 for a calendar year. Does not extend payment or the beneficiaries’ returns. The IRS may terminate an extension on ten days’ notice. The form must show a proper estimate of the tax; a knowingly understated estimate voids the extension (GCM 39014) and exposed a preparer to treble damages in Haddad Motor Group. Pay with it.
• Amended return: a new 1041 with the amended box checked, a statement of changes, and amended K-1s. There is no Form 1041-X.

Study questions 22, 23, 25

• SQ 22. A trust owing $1,000 or more pays estimates in four installments; 90% current or 100%/110% prior-year avoids the penalty; the prior-year safe harbor requires a full 12-month prior year and is simply unavailable, not annualized, if the prior year was short.
• SQ 23. The substantial-understatement penalty does not apply with reasonable cause and good faith; the IRS need not prove negligence.
• SQ 25. A 2019 return filed March 1, 2020 is deemed filed April 15, 2020; a late return starts the statute when filed; a basis overstatement counts as an omission for the six-year rule.

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.