Three high-tax states are responsible for most former-resident audits: New York, California, and New Jersey. Each uses a different legal theory, and the documentation needed to defeat each one is slightly different.
New York: 183-day rule and Matter of Hoff (DTA No. 850209)
New York applies both a domicile test and an independent statutory residence test under NY Tax Law §605. Even if you successfully moved your domicile to Florida, New York can still tax you as a statutory resident in any year you spend more than 183 days in NY and maintain a permanent place of abode there. The Tax Appeals Tribunal applied that standard in Matter of Hoff, DTA No. 850209, upholding statutory residence based on a NY home and day count. The audit defense is twofold: keep contemporaneous day-count records and either give up the NY abode or have an extraordinarily disciplined documentation pattern.
California: the FTB residency factor test (Pub 1031)
California’s residency rules under Cal. Rev. & Tax. Code §17014 and FTB Publication 1031 use a multi-factor facts-and-circumstances test. The FTB weighs where your home, family, vehicles, doctor, banking, professional licenses, and primary social ties are located. There is no single decisive factor. The audit defense is to make every factor point to Florida: the §222.17 Declaration, banks moved, vehicles retitled, professional licenses transferred, the homestead exemption claim on a Florida residence, and a documented pattern of severing California ties.
New Jersey: intent, time, and ties analysis
New Jersey applies a domicile test that looks at intent, time spent in each location, and quality of ties to each. NJ Division of Taxation guidance describes a multi-factor analysis without a bright-line day count for domicile purposes (though NJ does have its own 183-day statutory residence rule). The defense is similar to California’s: a recorded §222.17 Declaration, a real Florida home, and a paper trail showing intent to make Florida the principal home.
What auditors actually look for
Across all three states, the artifacts auditors request are consistent: bank statements showing where charges occur, cell tower geolocation, employer W-2 withholding history, primary care physician location, dentist, country club or social club memberships, gym memberships, vehicle plates and registrations, children’s school enrollment, and pet veterinarian records. The §222.17 Declaration is not magic on its own; what matters is the consistency of the surrounding paper trail.