Holmes Family Trust v. Multnomah County Assessor
Oregon Tax Court, Magistrate Division · Or. Tax Ct. · Oregon bar guidance
Conduct
Tax court plaintiff cited fabricated 'Dept. of Rev. v. Sec'y of State' estoppel case plus unrelated statute as estoppel support.
Consequence
Case dismissed on independent procedural grounds; AI-citation sanction declined because no prior AI-specific warning had issued.
Lesson
Oregon Tax Court applies the same Ringo verification expectation as the Court of Appeals; warning-then-sanction is standard.
Verified May 14, 2026
- Citation
- Holmes Family Tr. v. Multnomah Cnty. Assessor, TC-MD 250247N, 2025 WL 3641430 (Or. Tax Ct. Magis. Div. Dec. 16, 2025)
- Decided
- December 16, 2025
Summary
Holmes Family Trust appealed Multnomah County's denial of farm-use special-assessment requalification for tax years 2019 through 2024, arguing among other things that the County should be estopped from invoking the 90-day appeal statute of limitations. In its response brief, Plaintiff cited "Dept. of Rev. v. Sec'y of State, 16 OTR 350, 359 (2003)" with the parenthetical "(estoppel where representations induce reliance)." The court reviewed the citation and confirmed the case "does not exist." Plaintiff also cited "an incorrect authority, ORS 305.280(4), which has nothing to do with estoppel." The court attributed the fabrication to likely generative-AI use, citing Ringo v. Colquhoun Design Studio, LLC, 345 Or App 301 (2025), where the Oregon Court of Appeals fined an attorney $2,000 for submitting AI-generated false citations.
- AI tool:
- Generative artificial intelligence (specific product not identified by court)
What sanction did the court impose?
Defendant's Motion to Dismiss granted in part: Plaintiff's appeal of the 2019-20 through 2023-24 tax years dismissed for lack of aggrievement, and Plaintiff's appeal of the 2024-25 disqualification notice dismissed as untimely. The court declined to impose sanctions for the AI-generated citation because no prior AI-specific direction had been given to Plaintiff in the case, and instead admonished Plaintiff to use the State of Oregon Law Library or the Tax Court's Decisions, Opinions, and Orders webpage to verify case law before submitting it. Court warned that further citations to nonexistent law would trigger sanctions.
Why does Holmes Family Trust v. Multnomah County Assessor matter for law firms using AI?
Holmes Family Trust v. Multnomah County Assessor is the first AI-hallucination order from the Oregon Tax Court Magistrate Division included in this database, and it is procedurally significant for two reasons. First, it establishes that the Magistrate Division applies the same Rule-11-equivalent verification standard the Oregon Court of Appeals announced in Ringo v. Colquhoun Design Studio, LLC. Magistrate the court’s express citation of Ringo, combined with the warning that “should Plaintiff again cite nonexistent law, the court will reconsider sanctions,” is functionally a warning-then-sanction template that will apply to any future Tax Court litigant.
Second, the underlying procedural posture is unusual in the Oregon AI-conduct line. The court did not need to reach the AI-citation issue: the case was independently dismissed for lack of aggrievement on the older tax years and as untimely on the 2024-25 disqualification appeal. The Magistrate Division addressed the AI question anyway, and the court’s reasoning for declining sanctions (“the court has not previously given any direction to Plaintiff concerning the use of AI”) is a published-opinion notice device that subsequent Tax Court litigants cannot evade. The opinion also footnotes the Oregon Department of Revenue’s Farm Use Manual as the canonical source for the appeal-rights language used in disqualification letters, which is a useful authority for property-tax practitioners drafting taxpayer-side responses to assessor disqualifications. Note that the field-level pro_se status is omitted because the opinion does not specifically identify the trust as self-represented, and trusts as artificial entities typically require licensed representation; the editorial position is that the absence of an explicit pro se finding is not the same as a confirmed self-represented status.
Implications for your firm
Operational steps a firm reading this case may wish to consider documenting. Strategic and rule-application calls belong to your firm's attorneys.
- Property-tax practitioners should treat the Oregon Tax Court Magistrate Division as an AI-conduct enforcement venue equivalent to D. Or., not a more lenient forum; the court's express citation of Ringo signals that Oregon Court of Appeals AI-sanctions doctrine carries directly into Tax Court.
- When citing Oregon Tax Court precedent, verify against the Tax Court's Decisions, Opinions, and Orders webpage (courts.oregon.gov) rather than relying on Westlaw or Lexis OTR coverage; the court's admonishment specifically flagged its own database as the canonical source.
- For estoppel arguments against Oregon county assessors, ensure the underlying case authority actually addresses estoppel against governmental tax authorities; the Holmes brief cited a fabricated case for the bare proposition ("estoppel where representations induce reliance") that more straightforward Oregon authority would have supported.
Sources
Further reading
- https://ojd.contentdm.oclc.org/digital/custom/OJDRedirect?collection=p17027coll6&identifier=250247NHolmesFamTrustv.MultnomahCountyAssessorOrderGrantingDefendantMODMinpart.pdf
- Document mirror (Damien Charlotin hallucination database, Westlaw printout)
Source PDF is a Westlaw printout mirrored from the Damien Charlotin hallucination database. We are working to add the underlying court docket (PACER, CourtListener, or court website) as a second source.
- Specific signing magistrate name. The Westlaw citation captures the docket number and date but the editorial team did not independently confirm the magistrate's identity from the order PDF; the canonical Oregon Tax Court Magistrate Division opinion is published under the docket number TC-MD 250247N regardless of magistrate identity.