Stay under 184 days. Keep your domicile.
Snowbirds need exactly two things from a tracker: an accurate count of days in their old state, and a defensible record when the auditor calls. Tax Days does both — for NY, NJ, CT, MA, IL, CA, and every other state you spend time in.
What you're up against
184 days = full statutory resident, no defense
If you maintain a NY abode and spend 184+ days in NY, you're a statutory resident — taxable on 100% of your worldwide income for the entire year. No domicile claim helps.
Any part of a day counts
A 30-minute layover at JFK is a NY day. A Sunday brunch in Manhattan is a NY day. Driving I-95 through NY is probably a NY day.
NY collected $3 billion from residency audits
New York runs the most aggressive residency-audit program in the US. Departing residents are routinely targeted, especially after liquidity events.
Auditors will reconstruct your year — without your help
Cell tower records, EZ-Pass, credit cards, social media. If you don't have a contemporaneous log, the auditor's reconstruction wins.
What Tax Days does for you
Tracks days in every state you visit — old state, new state, anywhere in between.
Projects the exact date you'd hit 184 in NY, NJ, CT, MA, or any state with a 184-day rule.
Notifications fire weeks ahead — leave 24 hours early and keep your domicile claim.
Handles California's 9-month presumption + facts-and-circumstances test for departing CA residents.
Tracks Florida days alongside, building the affirmative evidence of your new-state ties.
Exports an audit-ready PDF per state with day count, trips, and rule evaluations. Hand it to your accountant or attorney.
Stays on your iPhone. No servers, no accounts, no logs. Optional iCloud sync.
The rules you actually need to track
New York 184-day rule
184 days + permanent place of abode = statutory resident. The most-audited rule in the country.
Read the guide →Florida domicile guide
Establish FL domicile correctly: Declaration of Domicile, driver's license, voter registration, homestead, professionals.
Read the guide →California's 9-month rule
No clean threshold — facts-and-circumstances test that's harder to defend than NY's 184-day rule.
Read the guide →New Jersey residency rules
Mirrors NY's 184-day + abode test. Aggressively audited, especially for NYC commuters.
Read the guide →Connecticut residency audits
Greenwich and Westchester departures get targeted. 183-day rule + abode + the DRS playbook.
Read the guide →Massachusetts 183-day rule + Millionaire's Tax
5% base + 4% surtax on income above $1M. 183-day + abode triggers full residency.
Read the guide →
Free guides and tools
- Guide
Snowbird tax tracker guide
The full playbook — domicile vs. statutory residency, the 184-day rule, common mistakes.
- Guide
Defending a residency audit
What to expect — timeline, evidence requests, the four pillars of audit defense.
- Calculator
Free 183-day rule calculator
Configure your old state's threshold (184 for NY/NJ/MA/CT) and see the projected crossover date.
- Guide
What records auditors actually accept
Contemporaneous vs. reconstructed records — and why the difference matters.
The snowbird app for an audit-proof year
Tax Days runs the math your accountant runs. $19.99/year covers it. The cost of one missed day is many multiples more.
