Illinois presents a tax profile that is, in certain respects, more challenging than the states typically associated with the Florida migration — and less discussed. The income tax is flat at 4.95%, which means the burden scales directly with income rather than compressing at lower brackets. The estate tax imposes rates up to 16% on estates above $4 million — one of the lowest estate tax thresholds in the country, capturing many upper-affluent families who would not face estate tax liability in any other state. And the property tax environment in Cook County and the North Shore suburbs is, by virtually any measure, among the most punishing in the United States: annual tax bills of $40,000, $60,000, or $80,000 on luxury properties in Winnetka, Kenilworth, and Lake Forest are not exceptional — they are routine.
The Florida migration from Illinois has been building for years, and it has accelerated as the property tax and estate tax burdens have become more difficult to rationalize against the remaining advantages of Illinois residency. Chicago remains a world-class city — its cultural infrastructure, its financial institutions, its architectural legacy, and its social fabric are not replicated anywhere. But the financial case for maintaining Illinois as a primary legal domicile for high-net-worth residents has weakened substantially, and the trajectory of the state's fiscal situation suggests it is unlikely to improve.
What the Illinois buyer is discovering — with increasing frequency, and through the personal networks that define the North Shore — is Vero Beach, Florida. One hour north of Palm Beach on an Atlantic barrier island, Vero Beach is a community that the Illinois buyer recognizes on arrival: low density by deliberate policy, wealth that does not organize around its own visibility, and club life that operates with the same unspoken standards that define Shoreacres or Onwentsia. This guide addresses the full transition — taxes, insurance, airports, golf communities, lifestyle, healthcare, and the market itself — in the terms an Illinois buyer requires.
The Tax Case: Illinois vs. Florida
The Illinois income tax rate of 4.95% is, in isolation, lower than Connecticut's, New York's, New Jersey's, and Massachusetts' rates on high earners. But the flat structure means it applies at the same rate to a $500,000 income as to a $50,000 income — with no relief at any level. And unlike New York or Connecticut, Illinois' property tax environment amplifies the burden at the asset level rather than the income level: the North Shore homeowner paying $60,000 annually in property taxes on a $3 million home is experiencing a real estate carrying cost that has no equivalent in Florida's primary residence market.
The estate tax is the element of Illinois' tax structure that surprises many high-net-worth families who have not recently reviewed their planning. The $4 million threshold — not the federal $13.61 million but a fraction of that — means that a family with a $5 million estate already faces Illinois estate tax liability. At rates reaching 16%, the Illinois estate tax can impose meaningful costs on wealth transfers that would pass entirely tax-free under Florida's structure, which has no estate tax at any level.