Domicile vs. Residency: Why Your Old State May Still Be Taxing You

The most expensive misconception in remote work taxation is that moving is an event you complete by arriving.

You sign a lease in Austin, your boxes arrive, you update your address with your employer. As far as you are concerned, you live in Texas now and California is behind you.

California may disagree, and it has years to say so.

Two different words that people use interchangeably

Getting this right requires separating two concepts that sound like synonyms.

Residency is usually about presence: how much time you spent in a state during a tax year. Many states have a statutory residency test — spend more than a set number of days there, typically 183, and you are a resident for tax purposes regardless of anything else.

Domicile is about intent: where your permanent home is, the place you intend to return to. You can have many residences. You have exactly one domicile, and it persists until you establish a new one. Not until you leave the old one — until you establish a new one. Those are different things, and the gap between them is where people get caught.

A state can tax you as a resident under either test. This is why “I spent fewer than 183 days there” is not the defense people expect it to be: it may resolve the residency question while leaving domicile entirely open.

Why the 183-day rule misleads

Day counting is appealing because it is countable. It produces a number you can defend with a calendar.

Two problems.

It is not the only test. If your domicile is still California, California can tax you as a resident on all your income no matter how few days you spent there. The day count is a separate, additional way to become a resident — not a ceiling on liability.

States define a day differently. In several states, any part of a day counts as a full day. Land at JFK at 11pm and leave at 6am the next morning, and that is two days in New York. People who plan around 183 days sometimes discover their count was never right.

California is explicit that it does not use a simple day count for residency at all. Its published guidance sets out a facts-and-circumstances analysis, weighing where your closest connections are.

What states actually look at

When a state examines a claimed move, it is looking for evidence about where your life genuinely is. The recurring factors:

Home. Do you still own or rent property in the old state? Is it available for your use, or genuinely let out? Which home is larger, and which do you treat as primary?

Time. Where did you spend your days — not just the count, but the pattern. Regular weekly returns look different from occasional visits.

Family. Where do your spouse and children live? Where do the children attend school? A family that stayed behind is among the strongest indicators that you did not really leave.

Professional ties. Doctors, dentists, lawyers, accountants, therapists. Continuing to fly back for routine appointments suggests your life is still centered there.

Formal registrations. Driver license, voter registration, vehicle registration, professional licenses.

Financial. Where is your primary bank, your safe deposit box, your financial advisor?

Social. Gym memberships, clubs, religious congregations, volunteer commitments.

Business. Where do you actually work when you are not remote? Where are the offices you visit?

No factor decides it. States weigh them together, and the question is always the same: taken as a whole, where does this person actually live?

The pattern that fails an audit

The typical failed departure looks like this. Someone rents an apartment in Florida, changes their mailing address, and files as a Florida resident. Meanwhile they kept the house in New York, their spouse and children stayed there through the school year, they returned most weekends, and they kept the same doctor, dentist and accountant.

Every individual choice was reasonable. Together they describe someone whose permanent home never moved, and that is what an auditor will conclude.

The successful version is not more clever. It is the same person actually moving: selling or genuinely letting the old home, the family relocating, changing professional relationships, and spending the bulk of their time in the new state.

Which states pursue this

Not all states audit departures with the same energy, and the pattern is predictable: states with high income tax rates and significant out-migration.

California is the most active. Its Franchise Tax Board publishes detailed residency guidance and applies a facts-and-circumstances test rather than a day count. It also has a safe harbor for people on out-of-state employment contracts meeting specific conditions — worth knowing about, because it is one of the few bright lines available, and it comes with requirements that must actually be met.

New York is similarly active, particularly for departures to Florida. It applies both a domicile test and a statutory residency test based on days plus maintaining a permanent place of abode. The combination catches people who thought moving their domicile was enough while keeping the apartment.

The destination states — Florida, Texas, Nevada — have no income tax and therefore no reason to audit. The scrutiny comes entirely from the state you left. This asymmetry surprises people: nobody in Florida will ever question your move, which is not the same as it being settled.

Doing it properly

If you are moving primarily or partly for tax reasons, the mechanics matter and the timing matters more.

Before and during the move:

• Move as completely as your circumstances allow. Sell or genuinely let the old home. A property kept available for your use is the single most damaging fact in a domicile case.
• File a declaration of domicile where the new state offers one. Florida does, and it is inexpensive and quick.
• Change the formal registrations promptly — license, voter registration, vehicles. Delay here reads as ambivalence.
• Move your professional relationships. New doctor, new dentist, new accountant. This is tedious and it is also strong evidence.
• Keep records of where you were. Contemporaneous records — calendars, flights, tolls, card transactions — are far more persuasive than a reconstruction three years later.

A caution on timing: moving mid-year makes you a part-year resident of both states, with income allocated between them. If you have significant equity compensation vesting that year, get advice before the move rather than after, because the allocation rules for bonuses and vesting equity vary by state and are not intuitive.

Who has to prove the move

In a residency dispute the practical burden usually falls on the person who claims to have left. The state does not have to show where you live; it can point to the facts it already holds, such as a property record, a school enrollment, or a wage statement still carrying the old address, and ask you to explain why they are not decisive. Both California and New York publish their guidance with this posture. They describe the factors they will examine and expect your records to answer them.

This changes how you should think about evidence. The question is rarely whether you can assemble a persuasive story after receiving a notice. It is whether the ordinary paper your life produced already tells that story. A lease, a utility bill, a new license, a school registration, a dated list of days spent in each state: none is impressive alone, but together they are difficult to argue with. A single contradicting document can undo them. A tax return that lists the old address, a mortgage application describing the old home as your primary residence, or a professional license renewed from the old state will be read as the more candid statement of where you live.

Consistency across documents matters as much as any individual fact. Be careful about what you sign after you move. If you tell a lender, an insurer, or an employer one thing about your primary residence and a tax agency another, the first statement will be the one produced in an audit.

Finally, remember that a filing is itself a representation. In the year you move, you will typically file as a part-year resident of the old state and report only the income allocated to the period you lived there. That return is the first place the state sees your claim, so the move date on it should match the date on your lease, your travel records, and every other document you have created.

The trap that survives a perfect move

Even a flawless domicile change may not end your liability to the old state.

If your employer is in a state with a convenience of the employer rule — New York, Pennsylvania, Connecticut, Delaware, Nebraska or Oregon — that state can continue taxing your wages as though they were earned there, because you work remotely for your own convenience rather than at your employer’s direction.

You can move to Florida correctly, establish domicile beyond dispute, and still owe New York on every dollar you earn from a New York employer. Domicile and source-of-income are separate questions, and winning the first does not settle the second.

This is covered fully in the convenience of the employer rule. If your employer is in one of those six states, the residency work described here may not save you anything at all.

The short version

Moving for tax reasons works, and people do it successfully every year. It works when the move is real.

The failures share a shape: someone changed their address without changing their life, then claimed a tax benefit based on the address. States audit exactly that gap, and the assessment arrives years later with interest.

Before relocating, get advice on your specific position — particularly if you own property in the state you are leaving, your family is not moving with you, or your employer is in a convenience-rule state. This article describes how these rules generally work and is not advice about your circumstances. See our disclaimer.