Background
Jack Anderson died in 2015 leaving a sizeable estate. He had maintained full homes in Greenwich, Connecticut; Vero Beach, Florida; and Arizona, typically spending about five and a half months per year in Connecticut, three and a half in Florida, and three in Arizona. The executor, Leslie B. Daniels, filed a domicile declaration with the Connecticut Department of Revenue Services claiming Anderson died as a Florida domiciliary—and therefore outside the reach of Connecticut’s estate tax under Conn. Gen. Stat. § 12-391(d)(1)(C). The department’s audit division disagreed, applied a twenty-eight-factor regulatory test with an undisclosed weighting system, and assessed $13,198,554.60 in Connecticut estate taxes. The department’s appellate division sustained that assessment.
The executor appealed to the Superior Court, which conducted a four-day de novo trial on domicile. The trial court found that Anderson’s personal, social, and property ties to Connecticut and Florida were “roughly equal,” but discounted the Florida indicia—driver’s license, voter registration, bank account, and personal declaration—as one-time administrative acts potentially undertaken to avoid Connecticut taxes. Because the executor failed to prove by clear and convincing evidence that Anderson was not a Connecticut domiciliary at death, the trial court sustained the assessment. The executor transferred the appeal directly to the Supreme Court.
After oral argument, the Supreme Court ordered supplemental briefing on two questions it raised sua sponte: (1) whether the clear and convincing standard from Leonard v. Commissioner of Revenue Services, 264 Conn. 286 (2003)—a sales-and-use-tax case—properly applies to estate tax domicile appeals, and (2) the correct scope of Superior Court review in such appeals.
The Court’s Holding
The court held that the executor need only prove by a preponderance of the evidence that the decedent was not domiciled in Connecticut at death, rejecting the commissioner’s argument that the elevated clear and convincing standard from Leonard governs. The court explained that Connecticut’s general rule is preponderance when a civil statute is silent on the standard of proof, and that the higher clear and convincing threshold is reserved for quasi-criminal allegations or cases involving particularly important individual rights. Because there was no compelling justification—no relevant legal encyclopedia authority, no consistent appellate precedent extending Leonard beyond sales-and-use taxes, and no persuasive theory of legislative acquiescence—to depart from that default in estate tax domicile disputes, the trial court’s application of the heightened standard was error requiring reversal and remand.
The court also confirmed that Superior Court appeals from the commissioner’s domicile determination proceed de novo—without administrative deference—even though the governing statutes (§§ 12-395 and 12-554) do not expressly say so. On remand, the trial court is not limited to the evidence or legal theories presented at the agency level and may weigh the regulatory domicile factors as it sees fit in light of the testimony and exhibits before it.
The court affirmed the rejection of the executor’s procedural due process claim. It held that even if the audit division’s untrained auditors and undisclosed weighting methodology constituted a due process violation, that error was cured by the executor’s opportunity to seek review before the department’s appellate division and to try the case fully de novo in the Superior Court. Administrative procedural errors do not carry forward and taint a subsequent de novo judicial determination absent evidence of actual contamination.
Key Takeaways
- In Connecticut estate tax appeals, a decedent’s estate now bears the burden of proving non-domicile by a preponderance of the evidence—not by clear and convincing evidence—even though the statutory presumption of Connecticut residency remains in place under § 12-391(h)(1).
- The Leonard clear-and-convincing standard is limited to sales and use tax appeals and has not been extended to estate tax or income tax domicile challenges at the Supreme Court level; prior Superior Court decisions applying it more broadly no longer control.
- Superior Court review of the commissioner’s domicile determinations is fully de novo: the court hears the evidence fresh, owes no deference to agency findings, is not confined to the administrative record, and may weigh the twenty-eight regulatory domicile factors as it thinks appropriate.
- Administrative procedural defects in the original audit—such as improper training or an undisclosed weighting system—do not create surviving due process violations when the taxpayer subsequently receives a full de novo hearing before the commissioner’s appellate division and a de novo trial in Superior Court.
- The Supreme Court may address an unpreserved burden-of-proof issue sua sponte where the standard of proof implicates the public’s interest in fair and accurate taxation, there is no prior appellate ruling on point, and all parties have had the opportunity to brief the question.
Why It Matters
Connecticut imposes one of the country’s broader estate taxes, and domicile disputes—where wealthy decedents spend portions of each year in multiple states—are fact-intensive and routinely contested. By replacing the clear and convincing standard with the preponderance standard, the court materially shifts the balance in these cases: estates that previously lost because their evidence was “equivocal” (as the trial court found here) may now prevail on the same record. Executors facing Connecticut domicile assessments will revisit pending matters, and the ruling will likely increase the volume of contested estate tax appeals as the bar for success drops.
More broadly, the decision draws a clear doctrinal line between sales-and-use-tax appeals (still governed by Leonard‘s clear and convincing standard) and estate tax domicile appeals (governed by preponderance), and it reaffirms that Connecticut’s default civil standard applies unless there is specific authority—statutory, regulatory, or from a recognized legal source—to justify elevation. Tax practitioners advising clients on domicile planning and change-of-domicile strategies in Connecticut should update their guidance on litigation risk accordingly.