If you work in a different state than the one you live in, taxes usually go like this: the state where you physically do the work taxes the income you earned there, and your home state taxes all of your income no matter where it came from. That looks like double taxation on paper, but it rarely plays out that way. Either the two states have a reciprocity agreement that lets you pay only your home state, or your home state gives you a credit for what you paid the work state. Which one applies depends on the specific pair of states involved and, increasingly, on whether you work remotely.
The Baseline Rule
The state where you show up and do the work gets to tax that income. Your employer there withholds state income tax from each paycheck the same way it would for a local employee. Your home state, separately, taxes your worldwide income because you live there. So the same dollars appear on two states’ returns.
You don’t actually pay twice. Two mechanisms fix the overlap: reciprocity agreements that stop the double withholding before it starts, and credits that reconcile the numbers when you file. Everything below is a variation on which of those two applies.
When One State Has No Income Tax
Nine states impose no individual income tax on wages: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. New Hampshire finished phasing out its tax on interest and dividend income in 2025.
If you live in one of these states and commute into a state that does tax income, you file a nonresident return in the work state and pay tax there. You owe nothing to your home state because it collects no income tax, and you also get no credit to offset the work-state bill. Your total state tax is whatever the work state charges.
If you live in a state with an income tax but work in one of the nine, it’s simpler still. The work state withholds nothing, and you report all your income on your home state’s resident return.
When Your Two States Have a Reciprocity Agreement
Roughly 30 pairs of states have reciprocity agreements, almost always between neighbors with heavy cross-border commuting. Under a reciprocity deal, you pay income tax only to your home state, even though you physically work in the other one. Your work-state employer withholds for your home state, and you skip the nonresident return entirely.
Reciprocity isn’t automatic. You have to file an exemption certificate, sometimes called a Certificate of Nonresidence, with your employer so they know which state to withhold for. A Pennsylvania resident working in New Jersey, for example, would give their employer Form NJ-165. Without the form, your employer withholds for the work state by default, and you sort it out at tax time.
States with several reciprocity partners include Illinois, Indiana, Kentucky, Maryland, Michigan, Ohio, Pennsylvania, Virginia, and Wisconsin. Not every bordering pair has an agreement, though, so check both states’ tax agency websites before you assume you’re covered.
Filing Two Returns and Claiming the Credit
When there’s no reciprocity, you file two returns. Start with the nonresident return in the work state, reporting only the income you earned there. Then file the resident return in your home state, reporting all of your income from every source. The resident return is where you claim the credit that prevents double taxation.
The credit reduces your home-state bill dollar-for-dollar by the amount you already paid to the work state, up to a cap. The cap is the amount your home state would have charged on that same income. If the work state’s rate is lower than your home state’s, the credit erases the overlap and you pay the difference to your home state. If the work state’s rate is higher, the credit maxes out at what your home state would have charged, and you eat the excess. You don’t get a refund from your home state just because another state taxed you more heavily.
One thing that trips people up is estimated payments. If your work-state employer doesn’t withhold enough for the nonresident state, or you have side income with no withholding attached, some states require quarterly estimated payments and charge underpayment penalties if you fall short. Check the work state’s rules as soon as the income starts.
Remote Work and the Convenience Rule
Most states tax wages based on where you’re physically sitting when you do the work. Several flip that logic with a “convenience of the employer” rule. If you work remotely for your own convenience rather than because your employer requires it, the state where the employer’s office sits can still tax your wages.
New York is the most aggressive enforcer. If your company is headquartered in New York and you choose to work from home elsewhere, New York treats your wages as New York-source income. In one well-known case, a taxpayer working from Kentucky for a New York employer had 100% of his wages taxed by New York because the remote arrangement was deemed a personal choice rather than a business necessity. Connecticut, Delaware, Nebraska, and Pennsylvania enforce some version of the rule as well.
The practical risk here is real double taxation, because your home state may not give you a full credit for taxes paid under a convenience rule it considers illegitimate. If you work remotely for an out-of-state employer, find out whether that employer’s state enforces a convenience rule before assuming your home state has the only claim on your paycheck.
When Time in the Work State Makes You a Resident There
Spending extended time in your work state can trigger a residency classification you weren’t expecting. Roughly 18 states treat you as a statutory resident if you maintain a place to live in the state and spend more than 183 days there during the year. Once you cross that line, the state can tax all of your income as a resident, not just the wages you earned locally.
This catches people who rent an apartment near a job site, travel heavily to a client’s office, or split time between two homes. The day count typically includes partial days, and audits are not rare. In aggressive states, tax authorities pull credit card charges, cell phone records, E-ZPass logs, and travel itineraries to reconstruct where you were.
If your arrangement puts you anywhere near 183 days, keep a contemporaneous calendar of where you are each day. Vague reconstructions after the fact don’t hold up well; a diary backed by receipts and travel records does.
City and Local Income Taxes
State tax isn’t the only layer. Hundreds of cities and municipalities impose their own income taxes, and many apply to nonresidents who work inside city limits. Ohio alone has more than 600 municipalities with local income taxes. Philadelphia charges a wage tax to everyone who works in the city, resident or not. New York City taxes only residents.
These local taxes are an extra filing obligation people routinely miss. Your home state’s credit for taxes paid elsewhere may or may not cover local taxes paid to another jurisdiction, depending on how the credit is defined. Some states allow credits only for state-level taxes, which leaves local taxes uncredited. If you commute into a major metro across a state line, check whether the city taxes nonresidents. Rates are usually lower than state rates, but they add up over a year, and penalties for not filing can exceed the tax itself.
When Occasional Work Doesn’t Trigger a Filing
Not every day of work in another state creates a filing requirement. A growing number of states set minimum thresholds before nonresidents have to file. Illinois, Indiana, Louisiana, and Montana use a 30-day threshold. Arizona uses 60 days. Georgia’s is 23 days, and Maine’s is 12.
Other states have no threshold. California, New York, New Jersey, Pennsylvania, and about a dozen others technically require nonresidents to file from the first day they work in the state. Enforcement against someone who spent two days at a conference is uncommon, but the legal obligation is there.
Some threshold states use a “mutuality requirement”: the relief applies only if your home state offers a similar exclusion or has no income tax. Alabama, North Dakota, Utah, and West Virginia currently work this way. If your home state doesn’t reciprocate, you may owe from day one regardless of the threshold.
If You Moved Mid-Year
If you relocated from one state to another during the year, you’re a part-year resident of both, not a cross-border commuter. Each state taxes you on the income you earned while you lived there, plus any income sourced to that state after you left. You file a part-year resident return in each state.
The typical method: the state figures your tax as if you’d been a full-year resident, then multiplies by the percentage of your total income actually taxable in that state. Both states will want a schedule showing how you split income between the two periods, and both will want to know the precise day your residency changed. Keep records of your actual moving date. The credit mechanism still applies if any income ends up claimed by both states during the transition.
Military Families
Federal law gives military families their own set of rules. Active-duty servicemembers keep their state of legal residence when the military stations them somewhere new, and their military pay is taxed only by that home state. Under 50 U.S.C. ยง 4001, a military spouse who moves to a new state solely to be with their servicemember doesn’t acquire tax residency there, and their earned income in that state isn’t treated as sourced to it.1Office of the Law Revision Counsel. 50 USC 4001 – Residence for Tax Purposes A 2018 update lets military couples elect the servicemember’s residence, the spouse’s residence, or the servicemember’s permanent duty station as their legal residence for tax purposes.
To use these rules, the spouse generally files an exemption form with their employer in the duty-station state, similar to the reciprocity certificate civilians use. Without it on file, the employer withholds for the wrong state and you have to claim the refund when you file.