On June 23, 2022, Ken Griffin — founder of Citadel and one of the wealthiest individuals in the United States — announced that Citadel’s headquarters would move from Chicago to Miami. Griffin himself, with an estimated net worth in the $49 to $51 billion range as of 2026, relocated personally. Citadel had been headquartered in Chicago for more than three decades, employed roughly 2,600 people there, and was one of the largest taxpayers in the state of Illinois.
The public reaction mixed shock, resignation, and confirmation. Shock because Griffin had been Chicago’s most visible philanthropist for years, having donated hundreds of millions of dollars to the city’s cultural and civic institutions. Resignation because the decision had been telegraphed — through Griffin’s political activity, his public statements, and the slow but unmistakable departure of other Chicago-based wealth — for at least two years before the move. Confirmation because it validated what Illinois fiscal analysts, tax attorneys, and high-net-worth residents had been privately discussing for a decade: Illinois’s fiscal trajectory is structurally unsustainable, and the people with the most to lose and the most mobility are going to leave first.
The Citadel move is the reference point for Chicago-to-Florida migration. Understanding why Griffin left, what it cost Illinois, and what has happened since is the clearest way to understand the broader exodus that his move made visible.
What Griffin Said and What He Did
Griffin’s public reasoning for the Citadel move emphasized three factors: Chicago’s crime environment, the state’s business climate, and concerns about Illinois’s political direction. In interviews and internal communications, Griffin was direct about the combination of issues that drove the decision. Violent crime in the Chicago neighborhoods where Citadel employees lived and worked had become a practical problem for the firm. Illinois’s fiscal and regulatory environment — not just taxes, but the broader set of policies and political trends — had reached the point where the firm’s long-term presence felt incompatible with its business needs.
The tax trajectory was a specific and deliberate concern. Griffin had personally been one of the largest political donors in Illinois for several years, with two notable investments worth revisiting. In 2020, he donated nearly $47 million to defeat the “Fair Tax” constitutional amendment — a ballot measure that would have replaced Illinois’s flat income tax with progressive rates topping out near 7.99% at the highest brackets. The Fair Tax was defeated, 55% to 45%. In 2022, Griffin donated $50 million to Richard Irvin’s Republican primary campaign for governor, hoping to produce a candidate capable of defeating Governor J.B. Pritzker in the general election. Irvin lost the primary. Pritzker won reelection in November 2022.
Between those two political investments — together totaling nearly $100 million — Griffin spent more money contesting Illinois tax and fiscal policy than most individual donors spend on national presidential campaigns. The political investments did not produce the outcomes Griffin wanted. The Citadel move, announced in June 2022, followed.
The sequence is worth sitting with. Griffin did not react to a specific tax increase, a specific legislative proposal, or a specific enforcement action. He reacted to the political trajectory of a state he believed was structurally committed to raising taxes on its wealthiest residents over time, with a flat tax that could be raised to any level, and a political environment that made progressive rates more likely at every future election cycle. He moved before the worst outcomes had materialized, precisely because he believed they would materialize.
The 2026 Reaffirmation
In May 2026, four years after the original announcement, Griffin publicly reaffirmed the Citadel move and reframed the decision in a way that the original announcement did not. Speaking at the Milken Institute Conference on May 6, Griffin said: “When we moved from Chicago, there was a debate between New York and Miami. It’s unquestionably true that we made the right choice.”
The remark was meaningful in two ways. First, it confirmed that New York had been seriously considered as the destination — a fact not emphasized in the 2022 announcement, which focused on Chicago’s problems rather than the runner-up’s. Second, it placed New York in the same category as the Illinois that Griffin had already left: a high-tax jurisdiction whose political trajectory had become incompatible with the firm’s long-term presence.
The immediate occasion was a Tax Day video by New York City Mayor Zohran Mamdani that featured Griffin’s Manhattan penthouse while announcing a proposed pied-à-terre tax targeting non-resident owners of high-value New York City real estate. Griffin called the video “creepy and weird.” His broader response was less reactive: “New York doesn’t welcome success,” and, “We need to double down on our bet in Miami because we want to be in a state that embraces business.” (For the structural details of the Mamdani proposal and what it would mean for affected New York property owners, see Mamdani’s Pied-à-Terre Tax: The New Math for New York High Earners.)
For the migration story, the May 2026 statements are useful as a four-year follow-up. Public moves of the Citadel scale are made in the context of expectations about the destination state and the originating state. In the four years since June 2022, Florida’s tax structure has not changed; Illinois’s fiscal pressures have not eased; and New York City’s political climate, by Griffin’s own assessment, has hardened against high earners in a way that vindicates the original choice between New York and Miami. Griffin’s “doubling down” language is the public version of a private posture that many migrants adopt at the four-year mark: the move has produced what was expected of it, and the case for staying has strengthened over time.
The Financial Logic
The personal tax arithmetic for Griffin was straightforward and large. Citadel’s profits in recent years have been substantial — the firm reported record-breaking investor returns in 2022 and has continued to perform at scale since. Griffin’s share of those profits, through his ownership of the firm, produces annual income that would be subject to Illinois income tax at 4.95% of essentially every dollar if he remained an Illinois resident. At Griffin’s income scale, the annual Illinois tax bill alone runs well into nine figures in strong years.
Florida taxes none of it. For Griffin personally, Florida domicile produces annual tax savings that are larger than the lifetime income of most working Americans.
The savings are not limited to income tax. Florida has no state estate tax. At Griffin’s net worth, a $4 million Illinois estate tax exemption against an estate of $50 billion produces a theoretical Illinois estate tax liability that — under the state’s graduated rate structure — is in the billions of dollars. Federal estate tax at 40% is a separate and larger number, but the state-level component is not marginal. Florida domicile eliminates it entirely.
Beyond Griffin personally, the Citadel move produced corporate tax consequences, compensation-related consequences for senior employees (many of whom also relocated and benefited from the Florida tax treatment of their own income), and structural consequences for the firm’s long-term operating expenses. The business case for the move, separate from Griffin’s personal situation, was also favorable.
What It Cost Illinois
The Illinois fiscal impact of the Citadel move is difficult to estimate precisely without access to the firm’s specific Illinois tax returns, but the order of magnitude is unmistakable. Citadel was one of Illinois’s largest individual corporate taxpayers. Griffin personally was likely the state’s single largest individual income taxpayer in multiple recent years. The combined Illinois revenue lost to the move — through Griffin’s personal tax, Citadel’s corporate tax, Illinois income tax on compensation paid to Chicago-based employees who relocated, and related losses — runs to hundreds of millions of dollars per year on an ongoing basis.
This is in the context of a state budget of roughly $50 billion and a pension liability — depending on the accounting methodology — of between $140 billion and over $300 billion. A single individual taxpayer’s departure, producing a recurring revenue loss of this magnitude, is not a rounding error. The Illinois Commission on Government Forecasting and Accountability and state budget analysts have quietly acknowledged for years that the revenue base is concentrating among a smaller number of high earners, many of whom have geographic flexibility.
Griffin’s departure also validated a migration pattern for other Chicago wealth. When the single largest individual taxpayer in a state makes the visible decision that the state’s fiscal trajectory is no longer compatible with their long-term presence, that decision carries signaling weight. Other high-net-worth individuals, family offices, and firms watching the same indicators have followed. The Chicago-to-Florida migration corridor was already active before June 2022. It has accelerated since.
The Broader Corporate Exodus
Citadel was not the first major Chicago-based institution to announce a departure, and it was not the last. The corporate exodus from Chicago in the early 2020s is worth understanding as context for the high-net-worth migration pattern that overlaps with it.
Boeing announced in May 2022 that it would move its global headquarters from Chicago to Arlington, Virginia, citing proximity to government customers and federal infrastructure. Boeing had been headquartered in Chicago since 2001, when the company consolidated from Seattle.
Caterpillar announced in June 2022 that its global headquarters would move from Deerfield, Illinois, to Irving, Texas. Caterpillar had been a Peoria-area institution for most of its corporate history and had only moved its formal headquarters to Deerfield in 2017. The move to Texas represented a full departure from Illinois.
Tyson Foods announced consolidation plans that shifted corporate functions out of Chicago in 2023, consolidating many positions to its Springdale, Arkansas, headquarters.
Each of these corporate departures carried its own specific rationale, and none was identical to Citadel’s. But the cumulative effect on Chicago’s corporate profile in a two-year window was substantial. A city that had been a reliable headquarters location for Fortune 500 firms for decades saw a noticeable net outflow of major corporate headquarters during the same period in which its highest-profile individual billionaire was publicly relocating.
For wealthy Illinois residents observing the pattern, the message was visible. The concentration of business infrastructure, executive decision-making, and professional relationships in Chicago was becoming measurably less dense. The social and professional communities that made Chicago an attractive place to stay for a high-net-worth individual were thinning.
The IRS Migration Data
The Internal Revenue Service publishes state-to-state migration data derived from tax returns. For Illinois, the data has shown consistent net out-migration of adjusted gross income for over a decade. Florida is consistently the top destination for departing Illinois AGI — a pattern that predates Griffin’s departure but has intensified in its wake.
The people leaving Illinois for Florida are not, in aggregate, lower earners. They are disproportionately weighted toward higher income brackets. This is mathematically unsurprising: the wealthiest residents have the most to gain from a tax-driven move and the most flexibility to execute one. But the concentration of the migration among high earners matters disproportionately to state finances. A state with a progressive income tax depends heavily on its highest earners. When a $5 million earner departs, Illinois loses roughly $250,000 per year in income tax revenue from that individual. When a $50,000 earner departs, Illinois loses roughly $2,500. The departing high earner’s fiscal impact is not proportionate — it is structural.
Illinois fiscal analysts have noted this pattern. The state’s official posture has tended to minimize the behavioral response to tax policy, arguing that the income elasticity of migration is modest at most. The IRS data tells a different story over time. In recent years, net AGI outflow from Illinois to Florida has run in the billions of dollars annually — a number that compounds as each departing high earner takes their future tax revenue with them.
The Fair Tax Vote: A Leading Indicator
The “Fair Tax” amendment on Illinois’s November 2020 ballot was, in retrospect, a leading indicator of the Griffin move and the broader migration pattern.
The amendment would have changed Article IX of the Illinois Constitution to allow the General Assembly to enact graduated income tax rates — replacing the constitutional requirement of a flat rate with discretion to create progressive brackets. The rates proposed by Governor Pritzker’s enabling legislation would have topped out near 7.99% at income above $750,000 for single filers and $1 million for joint filers.
The amendment was defeated, 55% to 45%. Opposition campaigns, funded heavily by Griffin and others, framed the vote as a pivotal moment for the state’s tax competitiveness. Supporters, funded heavily by Pritzker personally and by public-sector unions, framed the vote as a fiscal necessity given the state’s pension obligations.
For wealthy Illinois residents reading the political environment, the Fair Tax vote was a double-edged signal. On one hand, the amendment’s defeat confirmed that progressive rates could not be implemented without another constitutional amendment attempt — a high bar. On the other hand, the vote made clear that the political pressure to raise taxes on Illinois’s highest earners was structural and ongoing. A state with a $140+ billion unfunded pension liability, a flat income tax, and a majority political coalition in favor of progressive rates was going to keep attempting to raise taxes in some form. Whether through another Fair Tax attempt, an increase in the flat rate itself, a retirement income tax proposal, or some other mechanism, the pressure would not dissipate.
Griffin’s public position at the time was that the state was committed to policies that would produce accelerating departures over time. His subsequent decision to move Citadel, announced less than two years after the Fair Tax vote, was consistent with that position.
Who Is Leaving Now
The Chicago-to-Florida migration that Griffin’s move made visible is not a billionaire phenomenon. It is a high-net-worth phenomenon. The typical Illinois resident relocating to Florida for tax reasons is not a hedge fund founder. They are an executive with significant equity compensation; a business owner with pass-through income; a trader or portfolio manager with a movable practice; an entrepreneur who has sold a company and is contemplating investment income for the rest of their life; a retiree sitting on accumulated wealth whose Illinois estate tax exposure is large relative to their annual income.
The destinations within Florida vary by profile. Miami — Griffin’s destination — has attracted a disproportionate share of the hedge fund, private equity, and technology-adjacent migrants. Palm Beach and the broader Southeast Florida coast continues to attract the traditional wealth-management and retirement-oriented migrants. Naples has been the long-standing primary destination for Chicago-area departures — a community so thick with former Midwesterners that former suburban Chicago residents rebuild their social lives there with minimal disruption. Sarasota, Tampa, and Jacksonville have each absorbed meaningful subgroups of Illinois migrants.
What these migrants have in common, across destinations and wealth levels, is an understanding that the domicile change requires more than a filing. It requires a genuine change in where one lives, where one’s life is based, and where one can document having been through each year of the tax planning horizon. The failure mode — a claimed move that is not supported by the underlying facts — produces expensive Department of Revenue contests, and at the estate tax level, produces multi-million-dollar settlements or litigation after death.
The Lesson of the Griffin Move
The most durable lesson of the Citadel departure is not that wealthy people move when taxes rise. That lesson is well-documented in academic research and obvious in practice. The more specific lesson is that wealthy people move when they believe the trajectory of tax policy — not the current level — has turned against them for the long term.
Griffin did not move because Illinois raised his taxes. The flat 4.95% had been in place for years. He moved because he believed Illinois’s fiscal and political situation made higher taxes inevitable over time, and because the political coalition in favor of raising them had become structural. The move was a decision about the next twenty years, not about the last one.
For other Illinois residents weighing the question, the analysis is similar. The question is not whether the current Illinois tax profile is worth escaping in year one. For most high earners it is, but the annual savings alone rarely justify a complex life reorganization. The question is whether the Illinois tax profile five or ten years from now — after another pension bill, another budget crisis, another attempt at progressive rates, or another increase in the flat rate — is worth positioning against today. For many families, the answer is that the current trajectory is unfavorable enough that moving preemptively is cheaper than waiting for the worst case to arrive.
Florida offers the structural counterpoint: a constitutional prohibition on state income tax, no estate tax, a fiscal environment oriented around sales tax and tourism rather than progressive income tax, and a political culture in which no meaningful coalition is pushing to change any of this. The certainty matters. For a twenty-year planning horizon, the difference between “probably won’t raise taxes” (the pre-move Illinois position, from the perspective of some observers) and “structurally cannot raise taxes” (the Florida position) is substantial.
How Southbound Fits
The Ken Griffin move is the visible end of a distribution. Most Illinois-to-Florida migrants are not moving a hedge fund headquarters or giving press conferences about the decision. They are making a private family decision, executing a domicile change with their attorney and CPA, and then living their Florida lives quietly. For these migrants, the single most important thing to get right after the paperwork is the day count.
Illinois Department of Revenue audits of departing residents focus heavily on day counts because day counts are the most concrete evidence of where a person actually lived. A Florida driver’s license is paperwork. A Declaration of Domicile is paperwork. A closing statement on a Naples condo is paperwork. The day count is the behavior that either supports the paperwork or contradicts it.
Reconstructing a day count two years after the fact is difficult. It produces imprecise results. It looks exactly like what it is: a story assembled after the audit notice arrived.
Southbound builds the record automatically, in real time, from the day the user installs the app. The app runs in the background on iPhone, using iOS’s significant-location-change system to log whether each day is spent in Florida or outside it. It is passive, battery-efficient, and requires no ongoing attention from the user.
The Departure Budget — Southbound’s core feature — tells the user exactly how many days they can still spend outside Florida in the current year while remaining on track for 183+. For someone maintaining Illinois ties, traveling for business, or visiting family in the Midwest, that number makes the day-count question concrete in the moment rather than abstract in retrospect.
Location data is stored in the user’s personal iCloud account. Southbound has no servers holding location history. When a Department of Revenue audit arrives — whether for income tax or, years later, for estate tax — the record is exportable, GPS-verified, and timestamped continuously. It is the kind of documentation that looks like what it actually is: contemporaneous evidence created in the normal course of life, by someone who understood what was at stake and built the record before they needed it.
Ken Griffin’s move was a public decision. Most moves are private decisions. What both share is the need to be defensible, years later, in front of auditors who will not be satisfied with assertions alone.
This post is for general informational purposes only and does not constitute tax or legal advice. Information about specific individuals and corporate decisions is based on publicly available reporting. Interstate domicile planning involves complex, fact-specific legal questions. Work with a qualified tax attorney and CPA who specialize in Illinois domicile and interstate tax matters before making decisions based on anticipated tax treatment.
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Published Apr 22, 2026