A Chicago household earning USD 300,000 typically saves roughly USD 15,000+ annually in state income taxes by establishing Florida residency. Illinois charges a 4.95% flat state income tax plus a 1.5% Personal Property Replacement Tax on partnerships, S-corps, and trusts. Florida charges zero. For a USD 750K household the differential pushes past USD 35,000. Illinois property taxes rank among the highest in the U.S. (effective rate ~2.1%) vs Florida's ~0.9% with the homestead exemption — for a USD 1M home, that's a difference of roughly USD 12,000 per year in property taxes alone. Illinois also has an estate tax with a USD 4M exemption — Florida has none, which is meaningful for retirement households.

A Chicago North Shore budget that buys a 2,500-square-foot single-family home in Wilmette or Evanston (USD 1.2M range) typically buys a 4,000+ square-foot single-family home with pool and yard in Ponte Vedra, St. Augustine, or one of the gated St. Johns County communities. A budget that rents a downtown Chicago two-bedroom condo typically buys a similar-square-foot condo outright in Atlantic Beach or Mandarin. Property tax bills are dramatically lower than Cook County or DuPage County equivalents — frequently 60–75% lower for comparable home value.

Ponte Vedra Beach is the top Chicago destination — closest analog to the North Shore (Wilmette, Winnetka, Lake Forest) with TPC Sawgrass and PGA Tour HQ at the doorstep, minus the property tax. Nocatee pulls younger Chicago families with school-age kids — top St. Johns County schools, master-planned community comparable to Naperville or Wheaton but with year-round outdoor weather. St. Augustine attracts retirees drawn to historic-coastal charm. World Golf Village offers newer construction at lower entry points. Amelia Island and Atlantic Beach appeal to households wanting coastal-resort lifestyle.

Jacksonville averages near-zero snow vs Chicago's 30+ inches and December–February highs in the mid-60s vs Chicago's mid-30s with single-digit wind chills. Summer is the reverse — Jacksonville hits low-90s with mid-70s dew points and daily afternoon thunderstorms June–September; Chicago runs slightly cooler with lower humidity. The transition trades a punishing 5-month winter for a humid 4-month summer plus Atlantic hurricane risk June 1–November 30.

April through early November on the Chicago end (to avoid winter loadout weather risk), shifting to November through early April on the Florida end (to avoid hurricane season). Winter Chicago loadouts during active lake-effect snow warnings frequently delay 24–48 hours — build a weather buffer for December–February moves. Snowbird-southbound windows in October–November tighten long-haul carrier capacity; plan 12 weeks ahead.

Florida residency for tax purposes requires demonstrating Florida is your primary home — typically more than 183 days per year physically present in Florida, plus a Florida driver's license, Florida voter registration, a Florida-based primary bank account, and a homesteaded Florida primary residence with the homestead exemption filed at the County Property Appraiser's office. Many Illinois snowbirds maintain a smaller IL condo or townhouse and a Florida primary home, with documented day-counts. Illinois is generally less aggressive than New York or Massachusetts in challenging sub-183-day residency claims, but consult a tax attorney for household-specific guidance.

Chicago itself plus the broader Cook County metro is the dominant source. The North Shore (Wilmette, Winnetka, Glencoe, Lake Forest) and the affluent western suburbs (Hinsdale, Oak Brook, Naperville, Wheaton) feed steady flows. The South Suburbs and the southwest suburbs (Orland Park, Tinley Park, Frankfort) feed full-relocation working-age families. Rockford, Peoria, and Springfield downstate feed retiree snowbird traffic. Champaign-Urbana feeds occasional academic-and-medical relocations into Mayo Clinic Jacksonville.