Residency, domicile, and multi-state living

Households that keep more than one home often treat each one as a separate lifestyle decision: a winter place, a summer place, a city apartment, a condo near the office that became permanent. Taken together, they are a tax position, whether anyone chose one or not. States care where you are resident. Estate and inheritance taxes often care where you are domiciled. The two words mean different things, and confusing them is how people end up with tax bills they did not forecast.

This post explains the difference, the records that matter, and the questions to bring to counsel. It is not a relocation plan. Changing domicile is a legal and factual project for an attorney who knows both states. What this post can do is give you the vocabulary so the first meeting is spent on your facts, not on definitions.

Residency and domicile in plain language

Residency for income tax is defined by each state's statute. Many states treat you as a resident if you are domiciled there, or if you keep a permanent place of abode there and spend more than a set number of days there. You can be a resident of a state for income tax even when your permanent home is somewhere else.

New York is the standard example. A person domiciled elsewhere is a New York statutory resident if they maintain a permanent place of abode in New York for substantially all of the year (generally more than 11 months) and spend more than 183 days there. For this test, any part of a day in New York generally counts as a day in New York, with narrow exceptions such as passing through to travel elsewhere. Other states use different tests, and some have no statutory residency rule at all. Read the rule for the states that matter to you. The "183-day rule" heard at dinner is not one rule.

Domicile is your one true home: the place you live with the intent to remain indefinitely and return to when away. You have one domicile at a time and can have several residences. You keep your old domicile until you establish a new one with both physical presence and intent. Estate and inheritance tax planning usually turns on domicile. Income tax can reach you through residency rules even after your domicile has moved.

The most common mistake: announcing a move and assuming the tax law follows the announcement.

Why states audit residency

Households with investment income, pass-through income, and property in several states are high-value filers, and residency audits are productive for states. Auditors look at ordinary records: travel patterns, school enrollment, club memberships, voter registration, driver's licenses, where your doctors are, which boards you sit on, and where your pets and personal belongings are. If your returns say one state while your calendar, your children's school, and your business say another, expect questions. You may win, but winning still costs fees and time.

Day counts matter, but they are not the whole test

Some statutes set bright-line day counts. Domicile is still decided on many factors. How a day counts varies by state: partial days, medical stays, and travel days each have rules. Leaving late at night does not always help. Credit card records, phone location data, building access logs, and flight records can all be used to reconstruct your calendar, so assume reconstruction is possible.

Keep a presence calendar during the year for every year in which you spend meaningful time in more than one state. Do not rebuild it from memory the following April.

Permanent place of abode

In some states, keeping a dwelling that is available to you, owned or rented, combined with a day count, creates statutory residency regardless of domicile. "We barely use the apartment" describes how you live. It may not answer the legal question. Corporate apartments, a family member's home where you keep a room, and seasonal rentals each need review against your states' rules.

Factors that show domicile

Counsel will tailor the list to the states involved. Expect review of:

• Where you spend the most time, across several years
• Where your spouse and minor children live and go to school
• Driver's license, vehicle registration, and voter registration
• Doctors, dentists, and religious and social memberships
• Where you keep items of personal and sentimental value
• Declarations of domicile and homestead filings
• Where your work and business are actually conducted
• Where you have historically filed as a resident
• What address you gave banks, insurers, and lenders

No single factor decides the question. The pattern does.

Part-year residency

Moves rarely happen on January 1. Part-year returns split income under each state's sourcing rules: wages before the move, equity that vests after the move, and partnership income apportioned by where the business operates regardless of your move date. Some states also source deferred compensation and stock options by where the work was performed during the vesting period. A large sale timed near a move needs coordination between your preparer and counsel before the closing date is set.

Your entities do not move with you

Your residency can change while an S corporation or partnership keeps apportioning income to the old state because the business is still there. K-1s can create nonresident filing requirements in states where you no longer live. Rental property in the old state keeps producing income sourced there. Map entity footprints separately from your personal residency.

Spouses in different states

Some couples split their lives between two states for work or family reasons. Filing status, community property rules in the states that have them, and resident credits all get complicated. Get advice early, and document the facts as they are.

A change-of-domicile project in phases

1. Decide whether the move is real. If the job, schools, doctors, and social life stay the same, you have a second home, not a new domicile.
2. Counsel first. Use advisors who know both the state you are leaving and the one you are moving to. Ask about the first-year audit risk, estate tax, and statutory residency.
3. Change the records in sequence. Licenses, registrations, voter rolls, declarations, insurance, memberships, and doctors, done promptly and consistently.
4. Keep the calendar. The first year after a move is when day counts and the rest of the facts must line up.
5. Review entities and investments. Move what actually moves. A new mailing address does not move a business.
6. File consistently. Returns, school forms, and mortgage applications should tell the same story.
7. Maintain it. Domicile is a continuing set of facts, not a one-time filing.

Living in two states without moving

Many households never fully leave one state for another. For them the goal is accurate filing: the right resident and nonresident returns, estimates paid in the right states, presence logs, and avoiding accidental statutory residency. That is often a better path than a move the facts will not support.

Resident credits

Your resident state generally taxes all your income and gives a credit for tax paid to other states on income sourced there. The credit is limited by the resident state's own rules and rate, and it often does not cover city taxes. When two states both claim you as a resident, credits may not fully prevent double tax. Model the combined state burden for the year, not each state alone.

Estate and inheritance taxes

The federal estate tax exclusion is $15 million per person for 2026, but about a dozen states plus the District of Columbia impose their own estate tax, several with much lower exemptions, and a handful of states impose an inheritance tax. These taxes generally follow domicile for intangible property and location for real estate. A move made for income tax reasons can still make sense. If your estate is large enough for these taxes to matter, include estate counsel in the decision.

Scored diagnostic

Score each question 0, 1, or 2. Total possible: 24.

#	Question	Score
1	Can each adult state their domicile in one sentence?
2	Has counsel addressed residency risk in writing in the last three years?
3	Do you know which of your states have a statutory residency test?
4	Is a presence calendar kept during the year?
5	Are travel and access records kept for the audit period?
6	Do licenses, registrations, and voter records match your domicile?
7	Do school and family living arrangements match it?
8	Are nonresident and part-year returns planned before year-end?
9	Are estimated payments split across the right states?
10	Does someone turn K-1 state footnotes into a filing list?
11	Is a large sale held until move-year tax has been modeled?
12	Are spouses aligned on a documented plan?

Illustrative example

Illustrative: A couple claims a new domicile in a state without income tax after buying a home there. They keep a large apartment in their former state, their children attend school there part of the week, and their business is still headquartered there. Their days in each state are estimated after the fact. They sell a concentrated stock position in the claimed move year. The former state opens an audit. The dispute is not only about days. It is about where the center of their life remained.

Seasonal households

Spending summers in one state and winters in another is common, and it carries risk when no one is tracking it. Homestead filings, declarations, and day counts have to be managed together. A short residency review each fall, with the prior year's day counts in hand, is easier than fixing the year afterward.

Household staff and children

Where children sleep and where household employees work are facts in the file. If children live mainly in one state with a caregiver while the parents claim domicile in another, expect questions. Payroll registrations, school records, and tax positions should agree.

If a residency questionnaire arrives

Keep all documents, stop speculating by email, and bring in counsel and your preparer. Reconstruct the calendar carefully from records. Do not answer the auditor on your own.

Communication inside the family

Public statements, school applications, and online bios are part of the record. Agree on a short, accurate description of where the household is based and use it consistently with banks, insurers, and charities.

Questions for the first meeting with counsel

• What residency and domicile tests does each state use?
• What permanent place of abode risk applies to each property we keep?
• How will the move year treat equity compensation and planned sales?
• What state estate or inheritance tax should we model?
• How should spouses with different patterns file?
• How long should we keep records?

Bring the property list, entity chart, and last year's day count, even if it is incomplete.

A one-page residency summary

Keep one page with: claimed domicile, resident states for income tax, properties flagged for permanent place of abode risk, who keeps the day count, counsel of record, the date of the last written advice, and open issues. Update it when you buy or sell a home, change schools, or take a new board seat. Then file returns that match the life you actually live. For the documents your preparer will need, see what to send your tax pro before busy season.

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Educational only. This is not tax or legal advice for your situation. Consult your own CPA, EA, or attorney before acting.