183-Day State Residency Calculator

What is the 183-Day Rule?

The 183-day rule is the most common statutory test states use to determine whether someone is a resident for tax purposes. The logic is simple: half of a 365-day year is roughly 183 days, so if you spent more than half the year in a state — and you keep a home there — that state concludes you essentially lived there and can tax you as a full-year resident.

What makes the rule tricky is not the math but the definition. States define “day” differently. Some count any portion of a day you set foot in the state as a full day. Others use a “contact period” or require you to be present at midnight. A connecting flight through JFK can cost you a day in New York but not in Illinois.

Which States Use the 183-Day Rule?

Most states with an income tax apply some version of a 183-day statutory residency test — generally combined with a requirement that you maintain a permanent place of abode (a home) in the state. Notable exceptions include Hawaii (200 days), Idaho (270 days), Ohio (212 contact periods), Oregon (200), and North Dakota (210). The nine no-income-tax states (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming) have no threshold at all. California uses a “closest connections” test rather than a simple day count.

Even within the 183-day states, the mechanics vary. New York requires you to maintain a permanent place of abode for substantially the entire year (at least 11 months). Illinois layers on a facts-and-circumstances test. Massachusetts also taxes nonresidents on income earned from days physically worked in the state. The tool above encodes the current threshold and abode requirement for each state so you can see your exposure at a glance.

What Counts as a Day?

New York, New Jersey, Connecticut, Minnesota, and Maryland all count any part of a day spent in the state as a full day. There are narrow exceptions — for example, some states exclude days where you are in the state solely to change planes, or days you were hospitalized. States like Illinois and Massachusetts have historically used a less punitive counting method. Always check the specific state's rules; the difference between 182 and 184 days in New York can be life-changing.

The practical implication: you cannot rely on memory or calendar math. Auditors want contemporaneous evidence for each day — credit card receipts, EZ-Pass logs, phone records, or GPS data.

What Happens If You Exceed 183 Days?

If you cross your state's threshold and also maintain a permanent place of abode there, the state can classify you as a statutory resident and tax your entireincome for the year — including income earned outside the state. Because most states don't give a full credit for tax paid to another state on non-source income, this can lead to double taxation.

The best defense is a contemporaneous day-count log you can show an auditor. Reconstructing years after the fact almost never holds up. In a residency audit, the taxpayer bears the burden of proving they were somewhere other than the state asserting residency — missing evidence defaults against you.

Track Your Days Automatically with iReside

Manual day counting is tedious, error-prone, and hard to defend in an audit. iReside is an iOS app that runs quietly in the background and uses GPS to log which state you are in every day of the year. It sends alerts when you're approaching a state's threshold, and in one click you can generate an audit-ready report to share with your CPA.

Frequently Asked Questions

What is the 183-day rule?

The 183-day rule is a common test states use to determine statutory residency. If you spend more than 183 days in a state during the tax year and maintain a permanent place of abode there, the state can treat you as a full-year resident — even if you consider another state your home.

Does every state use 183 days?

No. Some states use different thresholds: Hawaii 200, Idaho 270, Ohio 212 contact periods, Oregon 200, North Dakota 210, New Mexico 185, Arizona 9 months, Alabama 7 months, Colorado 6 months. Nine states have no income tax and no threshold at all. California, Illinois, Oklahoma, Montana, Kansas, Michigan, Wisconsin, and a few others use a facts-and-circumstances test based on domicile, not a simple day count.

Does part of a day count as a full day?

In many states — including New York, New Jersey, Connecticut, Minnesota, Maryland, Utah, Massachusetts, and Virginia — any portion of a day physically present counts as a full day (with narrow exceptions for transit and medical stays). Pennsylvania uses a midnight-to-midnight rule instead. Ohio uses 'contact periods,' which require an overnight stay. Always check the specific state.

What is a 'permanent place of abode' and why does it matter?

It's a dwelling place maintained by you (owned or rented) that is suitable for year-round living. In most statutory-residency states, the day-count threshold only applies IF you ALSO maintain an abode. If you sold or gave up your in-state home, the day count alone typically won't trigger statutory residency — but you can still be taxed as a domiciliary if that state is your legal home, and on source income like wages or rental property. Use the 'Maintained a home here?' toggle in each row above to see how this changes your result.

What's the difference between domicile and statutory residency?

Domicile is your legal home — the place you intend to return to. It's an intent-based test that looks at factors like where your family lives, where your vehicles and licenses are registered, where you vote, and where your valuables are kept. Statutory residency is a mechanical day-count test. You can be domiciled in one state (say, Florida) but become a statutory resident of another (say, New York) by spending too many days there with an abode. Worst case, both states tax you as a full-year resident on the same income.

What happens if I exceed the threshold?

The state can assert that you are a statutory resident and tax your worldwide income for that year — potentially resulting in double state taxation since most states don't give a full credit for tax paid to another state on non-source income. At that point you need contemporaneous day-count records (GPS logs, travel receipts, credit card statements, EZ-Pass, phone records) to defend your position. Reconstructing after the fact rarely holds up.

Which states run the most aggressive residency audits?

New York is the most aggressive — it runs a dedicated residency audit program and has an extremely high bar for changing domicile out of the state. California, Minnesota, Connecticut, Maryland, Wisconsin, Maine, and Ohio are also known for actively challenging residency claims. If you're claiming a domicile change from any of these, keep meticulous records.

How do I share my inputs with my CPA?

Click the 'Share' button at the top of the calculator — it copies a link that encodes your tax year, claimed domicile, and every row you entered. Send the link to your accountant and they'll see exactly the same calculator state you do. You can also click 'Print / PDF' to generate a clean printable summary with citations, which many advisors prefer for their files.

How does iReside help?

iReside is an iOS app that uses GPS to automatically log which state you are in every day. It alerts you before you hit a threshold and generates audit-ready reports in one click. Instead of reconstructing your year from memory, you have a contemporaneous record auditors can't dispute.