A Connecticut court case, Daniels v. Commissioner, highlighted the complexities of establishing domicile for estate tax purposes, particularly for wealthy individuals with multiple residences. The case involved an individual, Mr. Anderson, who spent approximately 5.5 months in Connecticut, 3.5 months in Florida, and 3 months in Arizona annually. Despite having a Florida driver's license, being registered to vote in Florida, maintaining Florida bank accounts, and declaring himself a Florida domiciliary, the court determined he was domiciled in Connecticut at the time of his death in 2015. This ruling led to a $13 million Connecticut estate tax assessment against his estate.

The court emphasized that "one-time, administrative tasks accomplished with little more than an afternoon’s or a day’s effort" such as obtaining a driver's license or registering to vote, carried little practical significance in determining Mr. Anderson's day-to-day life and true domicile. Instead, the court found the most persuasive evidence to be where Mr. Anderson chose to spend his "most valuable and limited resource: his time." His consistent long-term decision to spend more time in Connecticut than any other state, combined with his "full personal, social, and property connections" in Connecticut, were key factors in the decision.

The ruling underscored that the burden of proof lies with the taxpayer or their executor to demonstrate a change in domicile. The executor in this case failed to prove that Mr. Anderson had effectively changed his domicile to Florida. This case serves as a significant reminder that tax authorities and courts will consider a multitude of factors beyond administrative steps when determining domicile for estate and potentially income tax purposes, especially when an individual splits time between multiple states.