Only 32 of 56 US Jurisdictions Use the 183-Day Rule. Here Is What the Other 24 Do

Ask almost anyone how state residency works and you will hear the same sentence: stay under 183 days and you are fine. It is the single most repeated piece of advice in multi-state tax planning, and for a majority of jurisdictions it is genuinely correct.

It is also wrong often enough to be expensive. We researched the residency rules for all 50 states, Washington DC, and the 5 US territories, working from revenue agency publications, statutes, and professional firm guidance, and compiled the result into a comparison of all 56 jurisdictions drawn from 536 cited sources.

Of those 56 jurisdictions, 32 use a 183-day threshold. Seven use a different number. Seventeen have no bright-line day count at all. That means 24 jurisdictions, just under half the map, do not work the way the common advice says they do.

These are the easiest to get wrong, because the rule looks familiar and behaves differently. A planner counting to 182 in Arizona is not close to the line. They are 92 days away from it.

Arizona uses 274 days. Idaho uses 270. Alabama uses 213. North Dakota uses 210. Hawaii and Oregon use 200. New Mexico uses 185.

Most of these are more generous than 183, which sounds like good news and quietly creates a different problem: someone who assumes the stricter rule may restrict their travel far more than the state actually requires, and make life decisions around a number that was never binding on them.

Seventeen jurisdictions run no numeric day-count test. Eight of them are the no-income-tax states where the question rarely bites: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, and Wyoming. If a state does not tax income, the day count is not what decides your bill.

The other nine do tax income and still give you no number to hit: California, Colorado, Illinois, Iowa, Kansas, Mississippi, Montana, Ohio, and South Carolina. Illinois is the one most often miscounted, including by secondary sources that assert a 183-day Illinois rule: 35 ILCS 5/1501(a)(20) sets no day threshold and no permanent place of abode prong, and in Cain v. Hamer the Illinois Appellate Court held snowbirds who averaged more than 183 Illinois days a year to be nonresidents.

This is the finding worth sitting with. In those eight, there is no threshold that makes you safe, because safety is not defined by a threshold. California runs a facts-and-circumstances closest-connections test, weighing where your family lives, where your principal home is, where your vehicles and license are registered, and where your professional relationships sit. No single factor controls and no day count ends the inquiry.

Ohio does something different again. It does not count days at all in the ordinary sense; it counts what the state calls contact periods, created when someone whose abode is outside Ohio is away from that abode overnight and spends at least part of two consecutive days in Ohio. Counting calendar days in Ohio and comparing the total to 183 measures the wrong thing entirely.

The comparison also scores each jurisdiction 1 to 5 on residency-audit aggressiveness, built from published audit guidelines, reported practitioner experience, and litigated cases.

Five jurisdictions score 5 of 5: California, Maryland, Minnesota, New York, and Puerto Rico. Six more score 4: Connecticut, Massachusetts, New Jersey, the U.S. Virgin Islands, Virginia, and Washington DC. At the other end, eight score 1.

That spread matters more than it first appears, because it does not track tax rates. Two states with similar top rates can present very different practical risk, and the difference is invisible if you are comparing rate tables alone. A move that looks identical on paper can carry a very different probability of being examined depending on which line you cross.

The report is free, needs no email, and is built to be checked rather than trusted. Every figure in it is generated directly from the underlying research, so it cannot state something the sources do not support, and every row links to that jurisdiction’s full guide with its citations.

Three ways to read it depending on what you are deciding.

Day counting is where most people start, and for the 33 jurisdictions using a 183-day rule it is a reasonable first approximation. But a day count is a claim, and a claim is only as good as what backs it.

In the nine taxing jurisdictions with no bright-line test, there is nothing to count toward. In the aggressive-audit states, the count is the beginning of the conversation rather than the end of it, because the burden of proving a change sits on the person who says they moved. In Ohio, the unit of measurement is not even a day.

That is the case for keeping a contemporaneous record instead of reconstructing one under examination. If you want to see where your own days actually fell, the Google Timeline Day Counter reads your existing location history entirely in your browser and checks it against each state’s real threshold, with nothing uploaded anywhere.