If you live in two states, you pay income tax first to the state that counts as your permanent home, and you also pay tax to any other state where you earned money or spent enough time to qualify as a resident there. Your domicile state taxes all of your income, no matter where you earned it. A second state can tax the income you earned within its borders, and in some cases it can tax everything if you crossed its residency threshold. Credits and a handful of state-to-state agreements keep most people from paying full tax twice on the same dollar, but the arithmetic only works if you file correctly in both places.
Your Domicile State Comes First
Every person has exactly one domicile at a time. Your domicile is the state you treat as your permanent home and intend to return to whenever you leave it. You can own property in several states and spend real time in each, but only one qualifies as your domicile. That state gets first claim on your worldwide income.
Federal regulations define domicile as the place where you live “with no definite present intention of later removing therefrom,” and once you have a domicile, it stays in place until you establish a new one somewhere else.1eCFR. 26 CFR 301.6362-6 – Requirements Relating to Residence Wanting to change it is not enough. You have to relocate and show through your actions that you have abandoned the old state and put down roots in the new one.
No single fact decides domicile. States look at the whole picture: where you are registered to vote, which state issued your driver’s license, where your vehicles are titled, where you bank, where your spouse and children live, the address on your will, where you claim a homestead exemption, and your social and religious ties. The more of these that cluster in one state, the stronger the claim there.
When a Second State Can Also Call You a Resident
Even with a clear domicile, another state can classify you as a resident based purely on how much time you spend there. This is called statutory residency, and it has nothing to do with intent. Exceed the threshold, and the state treats you as a full resident who owes tax on all income.
The most common version is the 183-day rule. Many states will treat you as a resident if you spend more than 183 days within their borders during the tax year and maintain a permanent place of abode there, meaning a dwelling suitable for year-round living that you own, rent, or have access to for substantially all of the year. Both conditions have to be met. States applying some form of this test include Connecticut, Delaware, Georgia, Indiana, Massachusetts, Minnesota, Missouri, Nebraska, New Jersey, Rhode Island, and Utah.
The counting details matter. In most states, any part of a day counts as a full day. A two-hour meeting followed by a drive home still adds a tally mark. New York uses a 184-day threshold rather than 183.2Department of Taxation and Finance. Permanent Place of Abode Some states use no day count at all. South Carolina, for example, decides residency solely through domicile analysis, with no minimum-day threshold. The specifics of your two states are what matter.
If you are anywhere near the line, keep a detailed travel log. Record where you sleep each night, and hang on to credit card receipts, calendar entries, and toll records. Under audit, the burden falls on you to prove where you were on each day of the year.
The Returns You Actually File
Your residency status in each state dictates which return you file and what income appears on it.
- Resident return. Filed in your domicile state, and in any state where you qualify as a statutory resident. Reports all of your income from every source, everywhere.
- Nonresident return. Filed in any state where you earned income but are not a resident. Reports only the income sourced to that state, such as wages for work performed there or rent from property located there.3Franchise Tax Board. Part-Year Resident and Nonresident
- Part-year resident return. Filed when you moved your domicile from one state to another during the year. You report the income earned while living in each state on the appropriate return.4Department of Taxation and Finance. Frequently Asked Questions About Filing Requirements, Residency, and Telecommuting for New York State Personal Income Tax
In practice, most people who split time between two states file at least two returns: a resident return in the domicile state reporting everything, and a nonresident return in the work state reporting only what they earned there. If you moved during the year, you file a part-year return in each state instead.
Nonresident Filing Thresholds
Not every dollar earned in another state triggers a filing requirement. About half of states set a minimum income or day threshold before a nonresident has to file. The thresholds vary widely. Vermont requires a return if you earn more than $100 from state sources. Minnesota’s threshold is $15,300. Connecticut uses a combined test requiring more than 15 working days and more than $6,000 in income. Missouri sets its bar at $600.5Tax Foundation. Nonresident Income Tax Filing and Withholding Laws by State, 2026
Roughly 22 states have no minimum dollar threshold at all, so any income earned there, or even a single day of work, can create a filing obligation.5Tax Foundation. Nonresident Income Tax Filing and Withholding Laws by State, 2026 If you travel to another state for business, check that state’s rules. States charge late-filing penalties and interest, and because there is no statute of limitations on a return you never filed, the liability can sit indefinitely until the state finds you.
How to Avoid Paying Full Tax Twice
Reporting the same income on two returns does not mean paying full tax to both states. The main safety valve is the resident credit. Your domicile state gives you a dollar-for-dollar credit for income taxes paid to another state on the same income. The credit is capped at the lesser of what you actually paid the other state or what your home state would have charged on that income. If your home state’s rate is lower, you will not get a full credit for the difference, but you also will not owe anything extra to your home state on that income. If your home state’s rate is higher, you owe the gap.
File in the right order. Complete the nonresident return first so you know exactly what you paid the work state, then file your resident return and claim the credit. Most state tax forms have a specific line or schedule for it.
Reciprocal Agreements
Some neighboring states skip the two-return process through reciprocal agreements. Under these pacts, residents of one state who commute to work in the partner state pay income tax only to their home state. You file an exemption certificate with your employer, and they withhold for your state of residence rather than the state where you physically work.
States and jurisdictions that currently have reciprocal agreements include Arizona, Illinois, Indiana, Iowa, Kentucky, Maryland, Michigan, Minnesota, Montana, New Jersey, North Dakota, Ohio, Pennsylvania, Virginia, West Virginia, Wisconsin, and Washington, D.C. Each agreement is bilateral, so it only applies between specific pairs of states. Michigan, for example, has reciprocity with Illinois, Indiana, Kentucky, Minnesota, Ohio, and Wisconsin, but not every state on the list. Washington, D.C., has one of the broadest arrangements, extending reciprocity to residents of any state.
Reciprocity applies only to wages and salaries from employment. It does not help with investment income, rental income, or business income from another state, and agreements can change, so confirm the current status between your two states before relying on one.
The Remote Work Trap
Working from home for an out-of-state employer creates a specific problem. A handful of states apply what is called a “convenience of the employer” rule. If your employer’s office is in their state, they can tax your wages even when you work from home in another state, unless your remote arrangement exists because your employer requires it rather than because you prefer it.
States enforcing some version of this rule include New York, Connecticut, Delaware, Nebraska, Pennsylvania, Massachusetts, and Arkansas. New York’s version is the most aggressive, presuming that all remote work happens for the employee’s convenience unless the employer can prove a business necessity. Under this rule, a software engineer living in New Jersey and working entirely from home for a New York employer could owe New York income tax on all wages as if they commuted to Manhattan every day.
New Jersey has responded with retaliatory legislation. For residents of states that impose a convenience rule (specifically Delaware, Nebraska, and New York), New Jersey applies the same rule in reverse: those states’ residents working remotely for a New Jersey employer owe New Jersey tax on their wages.6State of NJ – Department of the Treasury – Division of Taxation. Convenience of the Employer Sourcing Rule Enacted for Gross Income Tax FAQ The result can be genuine double taxation, because both states claim the same income and credits do not always fully resolve the overlap.
If you work remotely across state lines, find out whether your employer’s state has a convenience rule. The answer can shift your effective tax rate by thousands of dollars.
When One of Your States Has No Income Tax
Nine states do not tax wages or salary income: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.7Tax Foundation. State Individual Income Taxes on Nonresidents – A Primer If you are domiciled in one of these states but work in a state that does tax income, your situation is simpler in one way and worse in another.
The simpler part: you only owe state income tax to the work state on income earned there. Your home state has no tax to file, so there is no double-taxation issue to untangle. The worse part: there is no resident credit to claim. Someone domiciled in a taxing state can offset their home-state bill with credits for taxes paid elsewhere. Someone domiciled in a no-tax state pays the work state’s rate with no offset. If the work state has a high rate, that is the full cost.
This also matters if you are thinking about changing your domicile to a no-tax state. Moving to Florida or Texas can eliminate your home-state tax bill, but only if you genuinely establish domicile there. Keeping one foot in the old state while claiming the no-tax state as home is one of the most common triggers for a residency audit.
Residency Audits and How to Protect Yourself
States have grown aggressive about residency audits, especially for high earners who claim domicile in a low-tax or no-tax state while keeping ties to a higher-tax state. These audits are detailed and expensive to fight. The person claiming a change of domicile bears the burden of proving it by clear and convincing evidence.
Auditors do not just ask where you say you live. They reconstruct your physical location for every day of the audit period using credit card transactions, cell phone location data, toll records, airline boarding passes, and social media. They weigh evidence across several categories: which home is larger and holds more of your personal belongings; where your office is and where you actually work day to day; a day-by-day accounting of your location; where your spouse and children live and where the children attend school; and where you keep valuable personal items like artwork and heirlooms.
Common triggers include filing a change of domicile to a no-tax state while keeping a home, a business, or school-age children in the original state. Selling a large asset or business is another one, because the timing of a domicile change around a big taxable event draws scrutiny. Some auditors will even canvass neighborhoods to see whether a supposedly relocated taxpayer’s car still appears regularly in the driveway.
The best defense is unglamorous. Build a paper trail that tells a consistent story before you need it. After moving, update your voter registration, driver’s license, vehicle titles, financial account addresses, estate documents, and homestead filings promptly. Keep a travel diary. If you are going to claim a new domicile, actually live there. Half-measures invite exactly the kind of audit that is hardest to win.