The Drop Nobody Wanted: Overview

On May 12, 2026, the Amsterdam Court of Appeal¹ issued a landmark ruling: U.S. law firm’s Dutch branch must pay Dutch DJ and electronic music icon Tijs Tiesto nearly 17 million euros in damages, plus 35,000 euros in legal fees, for providing him with incorrect U.S. tax residency advice in 2012. The ruling overturned a 2024 first-instance decision that had recognized the advice was wrong, but denied damages on the grounds that no cognizable harm had occurred.

The Facts: A Timeline of the Case

2008 to 2013: The Advisory Relationship

Beginning around 2008, Tiesto's Dutch advisers engaged a Dutch tax specialist then employed at a U.S. firm’s Amsterdam office, to advise the DJ on an international tax structure. The firm provided guidance on, among other things, managing Tiesto's U.S. tax exposure as his global touring career reached its apex.

2012: The Year the Day Count Goes Wrong

In 2012, the year at the center of the dispute, Tiesto spent more days in the United States than the applicable threshold under the U.S. Substantial Presence Test (SPT). The tax specialist incorrectly advised Tiesto about the U.S. day-counting rules. As a result, Tiesto was unaware that he had crossed the threshold and had become a U.S. tax resident for that year. His U.S. tax returns for the relevant period were filed on that incorrect basis.

2018: The Error Surfaces

Six years later, in 2018, Tiesto discovered the filing error. He approached the U.S. Internal Revenue Service (IRS) under a voluntary disclosure and correction procedure to rectify the returns. The correction came at a cost: Tiesto was required to pay additional U.S. taxes on his worldwide income for the year of residency, plus a penalty. That combined amount, approximately 17 million euros, forms the basis of the damages award.

2024: The First-Instance Ruling (Lower Court)

In 2024, Tiesto brought a malpractice claim against his firm in the Amsterdam District Court. The lower court acknowledged that the tax advice given was incorrect. However, it denied damages on causation grounds. The court reasoned that, given Tiesto's extensive touring schedule, he likely would have become a U.S. tax resident regardless of the advice, and that his total tax burden might even have been higher than the 17 million euros he ultimately paid. On that reasoning, the court found no recoverable harm and dismissed the damages claim.

February 2026: Appeal and Settlement Attempt

Tiesto appealed. He argued that the lower court's causation analysis was wrong: had he been properly informed in time, he could and would have managed his U.S. days differently, stayed under the SPT threshold, and avoided U.S. residency altogether. In February 2026, the Amsterdam Court of Appeal ordered both parties to attempt a settlement, giving them two weeks for negotiations. The talks failed.

May 12, 2026: The Appeal Court Ruling

The Amsterdam Court of Appeal reversed the lower court. The court accepted Tiesto's causation argument and found it plausible that, had he been properly informed in time of the consequences of U.S. tax residency, Tiesto would have made different choices. He would have spent fewer days in the United States, would not have become a U.S. tax resident, and would not have incurred the extra tax and penalty. The court awarded the firm full liability for both amounts: the additional tax and the penalty. The law firm was also ordered to cover 35,000 euros in legal costs.

The Law: U.S. Tax Residency and the Substantial Presence Test

The United States taxes its tax residents on their worldwide income, regardless of where that income is earned or where it is paid. For non-U.S. citizens, residency is primarily determined under Section 7701(b),² which establishes the SPT.

The Mechanics of the Substantial Presence Test

Under the SPT, a foreign national becomes a U.S. resident alien for federal income tax purposes if, during the calendar year, they are present in the United States on at least 31 days AND the weighted aggregate of U.S. presence days over a three-year lookback period equals or exceeds 183 days. The formula is:

The weighting is the trap. An artist touring globally in consecutive years accumulates a multi-year residency shadow. A musician who logs 120 days in Year 1, 100 days in Year 2, and 130 days in Year 3 may not feel like a U.S. resident in any single year. Run the math: 130 + (100 / 3) + (120 / 6) = 130 + 33 + 20 = 183. Welcome to U.S. tax residency. The 183-day count applies even though the artist never spent more than 130 days in any given year.

What Counts as a 'Day'

A day of presence generally means any part of a calendar day spent in the United States. There is no de minimis exception: arriving at midnight and departing at 1:00 a.m. still counts. However, the following days are excluded from the SPT count:

1. Days the individual is unable to leave due to a medical condition that arose while present in the United States;
2. Days spent in transit between two foreign points (provided the individual does not leave the airport and is in the U.S. for fewer than 24 hours);
3. Days on which the individual is an exempt individual (e.g., certain diplomats, teachers, trainees, students, or professional athletes competing in charitable sports events);
4. Days of commuting from Canada or Mexico for residents of those countries who regularly commute to the U.S. for employment.

None of these exclusions is likely to be meaningful for a touring DJ flying commercial between festival stops.

The Exits: Exceptions That Can Save the Day

The Closer Connection Exception

Under Section 7701(b)(3)(B), an individual who satisfies the SPT may nonetheless avoid U.S. residency for a given year if:

1. The individual was present in the United States for fewer than 183 days during the current calendar year;
2. The individual maintained a tax home in a foreign country during the year; and
3. The individual had a closer connection during the year to that foreign country than to the United States.

The 'closer connection' analysis is fact intensive. The IRS examines the location of the individual's permanent home, family, personal belongings, business activities, social and cultural ties, and the country designated on official forms and documents. Critically, the closer connection exception is unavailable if the individual has taken steps to adjust immigration status or has applied for lawful permanent residence during the year.

Treaty Tie-Breaker Provisions

Where a foreign national is treated as a resident by both the United States and a treaty partner, the applicable U.S. income tax treaty may provide a tie-breaker rule. Under the U.S.-Netherlands Income Tax Treaty, which would have been applicable to Tiesto as a Dutch national, Article 4 establishes a hierarchy of tie-breaker criteria: permanent home, center of vital interests, habitual abode, and nationality. A Dutch national who can establish a permanent home and center of vital interests in the Netherlands, and who is not a U.S. lawful permanent resident, would generally be treated as a Dutch resident for treaty purposes, with U.S. tax limited to U.S.-source income at applicable treaty rates.

The unfortunate aspect of the Tiesto case did not stem from the fact that the law is unclear. It is clear, if technical. The case is unfortunate because the result was driven by an unforced, preventable error: that the advice given was factually incorrect on a matter that was entirely within the advisor's control to get right, i.e., counting days.

The Bill: Consequences of Inadvertent U.S. Tax Residency

For a high-earning global entertainer, inadvertent U.S. residency is not an administrative inconvenience. It is a material financial event.

The 2026 tax landscape has added complexity. Under the One Big Beautiful Bill Act (Pub. L. 119-21), the U.S. has restructured several international tax provisions, including adjustments to the net investment income tax and modifications to the GILTI framework (now renamed Net CFC Tested Income, or 'NCTI'). Inadvertent residency in the current environment carries more cross-border reporting and tax exposure than it did in 2012, which means the cost of a day-counting error is now higher, not lower, than when Tiesto's advisers made theirs.

Five Lessons for Global Touring Artists, Executives, and High-Net-Worth Individuals