Multi-State Residency Test Calculator 2026 (US)
Score your US multi-state residency situation for tax year 2026 against the two main tests states use: statutory residency (183-day rule + permanent place of abode) and domicile (factor-weighted intent test). Identifies dual-residency risk and suggests Resident vs Part-Year vs Non-Resident filing strategy. 100% private — no data leaves your browser.
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How US Multi-State Residency Works in 2026
States determine residency for income-tax purposes using two parallel tests, and you can fail (or pass) one without the other. The first is the statutory residency test: most states (NY, CA, NJ, IL, MA, and many more) treat you as a resident if you spent 183 days or more in the state during the tax year AND maintained a permanent place of abode there. The second is the domicile test — your true, fixed, and principal home, where you intend to return. Domicile is sticky: once established, it follows you until you affirmatively establish a new one. A taxpayer can be a statutory resident of one state and domiciled in another at the same time, which leads to dual-residency risk and double taxation unless credit-for-taxes-paid mechanisms apply.
Last updated: May 2026. Source: state Departments of Revenue rulings (NY 20 NYCRR §105.20, CA Rev & Tax §17014, IL 35 ILCS 5/1501) and IRC §7701(b) for the international substantial presence test.
The 183-Day Statutory Residency Test Explained
Almost every state with an income tax uses some form of the 183-day rule. New York and California are the strictest enforcers. The day count includes any part of a day spent in the state — flying through JFK on a layover counts, even if you never leave the airport. Driving across NY/CT for groceries counts as a New York day. Common myths the calculator above corrects: (1) "I only worked there 100 days" is irrelevant — vacation, weekends, and family visits all count; (2) "I have a Florida driver's license" doesn't override the 183-day test by itself; (3) "I left before December 31" doesn't matter if you already crossed 183. Document day counts with credit-card statements, EZ-Pass records, cell-phone tower data, and calendar exports — auditors do.
Domicile — The Subjective Intent Test
Where statutory residency is mechanical, domicile is intent-based and weighed across factors. NY auditors apply the so-called Five Primary Factors: home, business, time, near & dear (sentimental items), and family. Other states weight slightly differently but the same factors recur: driver's license state, voter registration, primary home location, employer state, business and investment locations, family location, professional licenses, and banking/healthcare relationships. The calculator above scores each factor 0–10 weighted by importance and reports a Domicile Score for each state. A meaningful difference (typically 60+ vs 40-) is the threshold most state auditors look for; close scores (within 10 points) flag dual-residency risk.
Filing Strategy — Resident vs Part-Year vs Non-Resident
Once you know your residency status, your filing path follows: Full-year Resident — file resident return in domicile state, report worldwide income; if you also triggered statutory residency in a second state, file resident there too and claim a credit for taxes paid to the other state. Part-Year Resident — used in the year you actually move with intent to change domicile; allocate income to the period each state was your home. Non-Resident — file in any state where you earned source income (wages worked in that state, rental income from property there) but were not a resident. The Tip box above suggests the most likely filing path for your inputs; consult a CPA before lodging if you have business income, NY/CA exposure, or a domicile change in progress.