The Cinderella Rule: How Billionaires Count Midnight

The statutory residency test does not measure hours, and it does not care how much of a day you spent anywhere. It counts calendar days, and a calendar day turns over at midnight. New York Tax Law section 605(b)(1)(B) taxes a person who is not domiciled in New York as a resident on worldwide income if two things are true: they maintain a permanent place of abode in New York, and they spend more than 183 days of the year there. New York City runs the identical test under New York City Administrative Code section 11-1705(b)(1)(B), with "city" substituted for "state." Both prongs have to be met. Exactly 183 days does not trigger it.

What makes the test unforgiving is the regulation that defines a day. Under 20 NYCRR 105.20(c), quoted verbatim in the Tax Appeals Tribunal decision discussed below, "presence within New York State [or City] for any part of the calendar day constitutes a day spent within New York State [or City]," subject only to narrow exceptions for boarding transportation to a destination outside the state or traveling through it to somewhere else. The Appellate Division upheld that regulation in Leach v. Chu, 150 AD2d 842. New York’s own Nonresident Audit Guidelines state the consequence flatly: any part of a day spent in New York, "for whatever reason (business or pleasure), would count as a day toward the 183-day rule, even if the taxpayer comes into New York and leaves on the same day."

So the practical geometry of the rule is a clock, not a calendar. Cross back over the line at 11:50 p.m. and the day that starts ten minutes later is clean. Linger until 12:10 a.m. and you have just spent a day you can never unspend. That is the whole of the thing people jokingly call a Cinderella rule, and it is not a metaphor the state uses. It is simply what happens when a threshold statute is enforced against calendar days rather than hours.

The guidelines do soften the extreme reading. "The literal interpretation of ‘any part of a day’ could mean stepping over the state line for one second; however, no audit is ever expected to be based on such a minimal amount of time spent in New York. Common sense must prevail." But do not read that as a grace period. The same chapter says brief presence normally counts, and cites Matter of John and Patricia D. Klingenstein, DTA No. 815156, where Connecticut residents living near the border came into New York on 21 and 22 days for shopping and dining and were held to be statutory residents. The administrative law judge wrote: "There is, unfortunately, no shopping or dining exception in the statute, regulation, or caselaw." Purposeful, voluntary presence is a day. Dinner is purposeful.

The clearest illustration of how far that arithmetic can be pushed is Matter of Julian H. and Josephine Robertson, DTA No. 822004. Robertson founded Tiger Management. He was domiciled in Locust Valley on Long Island, and he maintained an apartment in Manhattan. In 2000 he was winding down his hedge funds and did not need to be at the Park Avenue office every day.

The audit was not about domicile. The Division of Taxation conceded that Robertson was not a domiciliary of New York City. It also accepted that he had correctly filed as a city nonresident for 1997. The only question for the year 2000 was the day count, and on September 18, 2006, the Division issued a Notice of Deficiency asserting $26,702,341.00 in additional New York City personal income tax for that single year, plus interest. No penalties were asserted. The notice rested entirely on the conclusion that he was a statutory resident.

Seven days were in dispute going into the conciliation conference. The auditor conceded three of them, and the September 17, 2007 Conciliation Order sustained the notice with four days left: April 15, July 23, July 31, and November 16, 2000. The parties then stipulated that Robertson was present in New York City on 183 specific days and was not present on 179 specific days. The auditor, after subpoenaing telephone records, car service records, flight logs, bank records, golf club records, and credit card statements, had found his records reliable for 362 of the 366 days in the year, which the determination puts at 98.9 percent.

Read the arithmetic and the stakes become obvious. He was stipulated at 183 days, which is under the line. If the state won even one of the four remaining days, the count went to 184, and 184 is more than 183. One day, out of a leap year, was worth $26.7 million plus six years of interest.

The findings of fact describe a year run deliberately against the midnight line, and the language the office used for it is in the record. Robertson and his primary assistant, Julie Depperschmidt, referred to staying out of the city on a given date as "earning a tax day," "earning a tax-free day," or "getting the day."

The mechanics were mundane and repetitive. He went to Locust Valley on Friday afternoons and did not return until Monday, so that Saturday would be earned rather than spent. He avoided unnecessary weekend time in the city. He made a point of leaving New York City before midnight on the night before a day he would not need to be there, even when he was entertaining guests at the apartment, so the following day would count. On travel days he avoided routing through the city to or from the airport when he had no reason to be there, to keep from wasting a day. And he charged Depperschmidt with maintaining a contemporaneous account of his whereabouts and reporting his running totals so he could plan the rest of the year around the number still available.

On cross-examination the Division pressed him on whether that focus intensified as the year ran short, and he did not pretend otherwise. "Well, I mean obviously if it were December the 31st and I was missing a date, I was damn sure going to be out of town. If, so, I guess your point is proven." Asked whether leaving the city mattered less in March than on December 31, he answered: "It is right."

Two details in the record cut against the caricature of a man who never slept in Manhattan. The findings note there is no claim he spent every weekend of 2000 outside the city, and the electronic calendar shows several Saturdays with no scheduled appointments where he stayed in New York anyway. And the two preceding years are the sharpest reminder of who the rule actually binds. In 1998 and 1999 Mrs. Robertson was being treated for cancer in New York City, and as a result he could not hold his city presence to 183 days. They filed those two years as statutory residents and paid. The medical exception discussed below protects a patient confined for treatment, not the spouse sitting beside the bed.

Administrative Law Judge Dennis M. Galliher found on October 15, 2009 that Robertson had established by clear and convincing evidence that he was outside the city on all four disputed days, and canceled the notice. The Division filed an exception, but not on all four. It dropped July 31 and November 16 entirely. Only April 15 and July 23 went up to the Tax Appeals Tribunal.

April 15, 2000 was a Saturday, and it was tax day, which is the kind of coincidence that makes a case memorable. The evidence placing him out of the city was ordinary and cumulative. His appointments calendar showed his last New York City appointment on Friday April 14 at noon. Telephone records showed a call from the Locust Valley house to the Manhattan apartment at 6:04 p.m. that Friday evening. And on the Saturday morning, Mrs. Robertson signed the car service voucher for a ride from the apartment out to Manhasset to play golf with him, which the record notes was out of the ordinary because vouchers were normally signed by Robertson or by his assistant. Against that, the Division had one fact: a telephone call placed from the New York City apartment to his closed office on April 15.

July 23 is the better cautionary tale, because it is the day his own contemporaneous records got wrong. He was returning from an annual father and son golfing trip in Ireland. The arrival had originally been calculated in Greenwich Mean Time at roughly 2:00 a.m., which put the landing on July 24. The aircraft actually touched down at LaGuardia at 9:15 p.m. New York time on July 23. A time zone conversion had moved a day across midnight in the file the taxpayer himself was keeping. The evidence that resolved it was a car contracted and paid for by a fellow traveler, Mr. Coleman, which dropped Coleman off first and then delivered Robertson and his son to Locust Valley, backed by a pattern of telephone calls including one from Mrs. Robertson at the apartment to her husband at 6:59 a.m. the next morning. The Tribunal reasoned she would not have called him at that hour if he were in the apartment with her.

The sentence worth carrying out of the decision is short. "Credible testimonial evidence becomes clear and convincing when it is backed up by documentary evidence." Neither day was proven by a single decisive document. Both were proven by a routine, corroborated from several directions at once.

The burden in a statutory residency case sits entirely on the taxpayer. Quoting Matter of Holt, the Tribunal restated it: the petitioner must "come forward with clear and convincing evidence proving . . . that . . . he did not spend in the aggregate more than 183 days" in the city. There is no presumption in your favor and no requirement that the state prove you were there.

What the decision clarified is how that burden can be carried. It may be met "through testimonial evidence, documentary evidence, or a combination of the two," citing Matter of Avildsen, Matter of Armel, and Matter of Moss. A clearly established pattern of conduct from which location can be determined suffices for that day, per Matter of Kern. General testimony about "patterns and habits of life," coupled with supporting documentary evidence, suffices per Armel. And a contemporaneously maintained diary or calendar with consistent supporting testimony will meet the burden "absent other evidence which is inconsistent therewith or indicates that the diary or calendar is in some other manner unreliable."

The Tribunal then explained why it refused to require a document for every day. The "gold standard" of proof would be something objectively verifying your presence somewhere else to the exclusion of any other place, and the example the decision picks is a jailer’s record of incarceration. But requiring that for all 184 days "would leave the taxpayer’s burden of proof to be ‘beyond all doubt,’ higher even than the criminal conviction standard of ‘beyond a reasonable doubt.’" The decision notes the Division’s own audit manual concedes the point by acknowledging days spent at home watching television or gardening, for which no document exists.

It is equally worth knowing how the losing side of that standard looks. In Holt, the taxpayer produced no evidence of patterns or routines, submitted conflicting day counts based on poorly photocopied calendars filed after the hearing that were in places illegible, cryptic, written over, or scratched out and changed, and gave vague testimony with essentially no corroborating records. He lost. The difference between Holt and Robertson is not wealth or counsel. It is whether the record was built while the year was happening.

And this was a two to one decision, which is the part practitioners tend to skip. Commissioner Carroll R. Jenkins dissented and would have reversed. He argued the majority improperly shifted the burden onto the Division to produce evidence of city presence, that ten days of other people making calls from the apartment "certainly does not indicate a pattern of conduct" sufficient to establish anyone’s whereabouts, and that the assistant lacked first-hand knowledge on precisely those days when she had to ask Robertson whether he had earned a tax day. On July 23 he found the conflict between the contemporaneous records saying Ireland and the reality of an evening landing to be evidence that "militates against a finding of clear and convincing evidence." His closing line is the warning: "If this is all it takes for the majority to find clear and convincing evidence, they have inappropriately redefined the term." Anyone treating Robertson as a template should notice that one commissioner thought the file was not good enough.

The December 2021 Nonresident Audit Guidelines, the manual New York writes for its own auditors, now cite the case by name. Chapter V explains that taxpayers can meet their burden "in a variety of ways as was explained in Matter of Julian H. and Josephine Robertson, DTA No. 822004," and then repeats the Tribunal’s formula about testimonial evidence, documentary evidence, or a combination of the two. The billionaire’s four-day win became the state’s own instruction to its examiners.

The manual also spells out how it evaluates a claimed absence, and the example is instructive. If phone bills show calls from a Connecticut home from early morning until late afternoon and nothing places the taxpayer in New York, "it would be reasonable to conclude that the taxpayer was not in New York." That presumption "would not apply if phone bills for the New York residence showed calls on the same day," or where the taxpayer has not complied with record requests, or has "demonstrated a pattern of being in both locations on the same day." On weekends specifically, the guidelines instruct auditors to "generally accept the taxpayer’s allegations absent evidence to the contrary such as a clear pattern of regularly being in New York on weekends."

That cuts both ways, and the manual warns auditors about the other direction too. It lists "false" indicators that can mistakenly turn a non-New York day into a New York day: "credit card purchases in New York by children, phone calls by housekeepers, and children or relatives staying at the New York address as a guest of the taxpayer when he may not be in New York." Robertson’s April 15 phone call from the apartment is exactly that category of fact, which is presumably why it did not carry the day.

The records the guidelines tell auditors to request are the same records worth keeping in advance: personal diaries and calendars in written or electronic form, credit card statements and receipts, bank statements and canceled checks and ATM receipts, telephone records for both the New York and the non-New York residence, utility bills for both, homeowner’s insurance policies showing where valuables are kept, commercial flight itineraries or flight logs for private carriers, hotel receipts, E-ZPass records, moving bills, and security or swipe cards for office building access. Regulation 105.20(c) is explicit that a nondomiciliary maintaining a New York abode "must keep and have available for examination . . . adequate records to substantiate the fact that such person did not spend more than 183 days of such taxable year within New York State." The obligation to keep the file is part of the rule, not a defensive tactic.

Two carve-outs exist, and both are smaller than people assume. The first is travel. Presence is disregarded under 105.20(c) only if it is solely for boarding a plane, ship, train, or bus for a destination outside New York, or for continuing travel begun outside the state to a point outside the state. A Connecticut resident driving to JFK to fly to Europe does not spend a New York day.

The line gets tested by whatever else you do while you are there. The guidelines apply two criteria: whether the activity is incidental to travel, and how much control you exercise over your own travel arrangements. Someone who arrives a day early for a cruise in order to attend a business meeting has spent the day. Someone who visits a friend during an unavoidable delay or stopover has not. Buying a meal at a terminal, using an ATM, stopping for gas while driving through, picking up a traveling companion on the way, or parking in New York to meet a car to the airport do not change the day’s treatment as a travel day.

The second is medical. Stranahan v. State Tax Commission, 68 AD2d 250, held that when a nondomiciliary seeks treatment for a serious illness, time spent in a medical facility for that treatment should not count. Audit policy extends that to confinement in a New York medical institution for any reason, serious or otherwise, including an emergency that happens while you are in the state for other reasons and leaves you unable to travel. But the exclusion stops at the door. It does not reach outpatient care, and the Appellate Division confirmed that limit in Matter of Ralph and Leona Kern, 240 AD2d 969. Doctor visits, infusions you drive home from, and consultations are New York days.

This is where the corridor matters more than the headline. The Klingenstein taxpayers lost on 21 and 22 days of border crossings. If you are moving from New York to Connecticut or moving from New York to New Jersey, your exposure is not a handful of dramatic trips, it is the accumulation of ordinary evenings, and it accrues in a jurisdiction whose day-count math you can check against every state’s actual statutory threshold with the day count checker before you are asked to reconstruct it.

Strip away the dollar figure and Robertson’s advantage was not his lawyers. It was that 362 of his 366 days were already documented by someone whose job included asking, in real time, whether the day had been earned. When the Division subpoenaed the telephone companies without notifying him, the records it pulled largely matched what his office had already recorded. The four days that remained were the four with the thinnest contemporaneous trail.

And notice which one nearly sank him. July 23 was not a day he tried to hide. It was a day a Greenwich Mean Time conversion had filed on the wrong side of midnight. His own calendar said Ireland. The plane had landed at LaGuardia at 9:15 p.m. A careful, well-staffed, professionally advised taxpayer still had a midnight error sitting in his file for six years, and it took a hearing to correct. If your own record is a memory and a credit card statement, the equivalent error is not going to be correctable at all.

Then there is the calendar of the case itself. The tax year was 2000. The notice came in September 2006. The hearing ran across September 2008 and September 2009. The determination issued in October 2009 and the Tribunal decision in September 2010. That is a decade of life spent litigating four days. New York residency audits more typically run 12 to 24 months from first contact to resolution, and New York’s statute of limitations generally runs three years from filing, six years if more than 25 percent of income was omitted, and never expires if no return was filed at all. The full posture is on the New York residency guide.

The practical takeaway is not to leave the state at 11:50 p.m. It is that a threshold rule enforced against calendar days rewards exactly one behavior: recording where you slept while you still remember. Anyone moving from New York to Florida with a Manhattan apartment they intend to keep is standing in Robertson’s position with a smaller budget. The apartment satisfies the first prong on its own. Everything after that is arithmetic, and arithmetic is only as good as the record behind it.

The Mobility Map records days and nights across states as they happen, against each jurisdiction’s own threshold, so a year is counted while it is being lived rather than reconstructed under a document request years later. Evidence Vault holds the categories the state’s own list asks for: calendars, travel itineraries, financial records, and property and residence documents. AuditIQ surfaces the thin days and retained-tie exposure that a file like Robertson’s reduced to four, and advisor sharing lets a CPA or tax attorney review the chronology directly.

This article is informational and does not evaluate any individual’s tax situation. ResidencyIQ is not a law firm or accounting firm; work with a qualified CPA or tax attorney on your own residency change or audit.

Matter of Julian H. and Josephine Robertson, New York State Tax Appeals Tribunal, DTA No. 822004 (Decision, September 23, 2010), is the source of the text of 20 NYCRR 105.20(c) and New York City Administrative Code section 11-1705(b)(1)(A) and (B) as quoted, the stipulation of 183 New York City days and 179 non-New York City days, the four disputed days, the "earning a tax day" terminology and its footnote, the findings on Friday departures to Locust Valley and leaving before midnight, the cross-examination exchange about December 31, the finding that several Saturdays were nonetheless spent in the city, the 1998 and 1999 statutory residency filings during Mrs. Robertson’s cancer treatment, the April 15 and July 23 evidence including the 6:04 p.m. Friday call, the car voucher signed by Mrs. Robertson, the Greenwich Mean Time arrival error and the 9:15 p.m. LaGuardia landing, the 6:59 a.m. call the following morning, the burden of proof discussion citing Matter of Holt, Matter of Avildsen, Matter of Armel, Matter of Moss, Matter of Kern, and Matter of Reid, the "gold standard" and "beyond all doubt" passages, the description of the taxpayer’s proof in Holt, the telephone subpoenas issued without notice to the taxpayer, and the dissent of Commissioner Carroll R. Jenkins: https://www.dta.ny.gov/pdf/archive/decisions/822004.dec.pdf.

Matter of Julian H. and Josephine Robertson, New York State Division of Tax Appeals, DTA No. 822004 (Determination, October 15, 2009), is the source of the $26,702,341.00 Notice of Deficiency dated September 18, 2006 and the absence of penalties, the narrowing from seven disputed days to four at the conciliation conference and the September 17, 2007 Conciliation Order (CMS No. 216932), the auditor’s acceptance of 362 of 366 days at 98.9 percent, and the hearing dates before Administrative Law Judge Dennis M. Galliher: https://www.dta.ny.gov/pdf/archive/determinations/822004.det.pdf.

New York State Department of Taxation and Finance, Nonresident Audit Guidelines (December 2021), is the source of the citation of Robertson as the standard for meeting the burden of proof, the "any part of a day" discussion and the Leach v. Chu citation, the "common sense must prevail" passage, the Matter of John and Patricia D. Klingenstein (DTA No. 815156) shopping and dining holding and its quoted conclusion of law, the recordkeeping requirement quoted from 20 NYCRR 105.20(c), the Connecticut phone bill example, the weekend instruction to auditors, the "false indicators" passage, the travel exception criteria and terminal activity examples, the Stranahan v. State Tax Commission (68 AD2d 250) medical confinement policy and the outpatient limit in Matter of Ralph and Leona Kern (240 AD2d 969), and the list of personal and business records typically requested: https://www.tax.ny.gov/pdf/2021/misc/nonresident-audit-guidelines-2021.pdf.

New York Tax Law section 605(b)(1)(B) supplies the two-prong statutory residency test for New York State, and the statute of limitations figures and the typical 12 to 24 month duration of a New York nonresident audit come from ResidencyIQ’s own dossier research, with underlying citations on the New York residency guide.