Filing in multiple states is not optional and it is not rare. If you earn wages in a state that is not your home state, own rental property across state lines, receive K-1 income from a partnership operating elsewhere, or work remotely for an out-of-state employer, you likely owe at least one additional state tax return. The rules for who owes what to which state are not uniform -- each state sets its own thresholds, its own sourcing rules, and its own level of aggressiveness in pursuing non-resident income. What follows is a state-by-state breakdown of how multi-state taxation works, where the traps are, and how to avoid paying more than you owe.
The word the tax world uses is "nexus" -- a sufficient connection between you and a state that gives it the right to tax you. For individuals, nexus is simpler than for businesses, but it still catches people off guard.
You generally have a non-resident filing obligation in another state if you earn wages there, own rental property that generates income there, receive partnership or S-corporation income sourced to that state, or sell real property located there. Technical detail
Physical presence still matters. Working on-site in another state for even a few days can trigger a filing requirement. Several states -- including New York, California, and New Jersey -- count any part of a day spent working in-state as a full day for purposes of determining non-resident tax liability. Technical detail
Economic nexus for individuals is less common than for businesses, but it exists. Owning real property, receiving income from in-state sources, or holding an interest in a pass-through entity doing business in a state can all create nexus without your ever setting foot there.
Reciprocity Agreements: The Simplest Fix for the Most Common Problem
If you live in one state and commute to work in a neighboring state, a reciprocity agreement may eliminate the need to file a non-resident return entirely. Under reciprocity, the work state agrees not to tax residents of the partner state, and you pay tax only where you live.
There are approximately 30 reciprocity agreements currently in effect across 16 states and the District of Columbia. Tax Foundation, "State Reciprocity Agreements" (2025). The most relevant clusters for commuters:
- New Jersey and Pennsylvania have a reciprocal agreement. A New Jersey resident working in Philadelphia pays New Jersey income tax only, and vice versa.
- Virginia, Maryland, D.C., and West Virginia form a reciprocity block covering the Washington metropolitan area.
- Illinois has reciprocity with Iowa, Kentucky, Michigan, and Wisconsin.
- Ohio has reciprocity with Indiana, Kentucky, Michigan, Pennsylvania, and West Virginia.
- Michigan has reciprocity with Illinois, Indiana, Kentucky, Minnesota, Ohio, and Wisconsin -- one of the broadest networks in the country.
- Minnesota has reciprocity with Michigan and North Dakota.
- Arizona has reciprocity with California, Indiana, Oregon, and Virginia.
To claim reciprocity, you typically file an exemption form with your employer (the specific form varies by state) so that the work state does not withhold income tax from your paycheck. If your employer withholds anyway, you will need to file a non-resident return in the work state to claim a refund, and then report the income on your resident return.
Reciprocity agreements cover only wage and salary income. They do not cover business income, rental income, capital gains from property sales, or partnership distributions. If you have non-wage income sourced to another state, reciprocity will not help.
The Convenience of the Employer Rule: Remote Work's Tax Trap
Remote work created an entirely new category of multi-state tax problems. The core question: when you work from home in State A for an employer located in State B, which state gets to tax your income?
Most states source wage income to the state where the work is physically performed. Under this majority approach, if you work from your home in Florida for a company headquartered in Texas, neither state taxes your income (since neither has an income tax). If you work from North Carolina for a Georgia employer, North Carolina taxes you as a resident and Georgia generally does not tax you because the work is not performed there.
But a handful of states apply the "convenience of the employer" rule, which reverses this logic. Under this rule, if you work remotely for your own convenience (rather than because the employer requires you to be remote), the employer's state can tax your income as if you were working there in person. Technical detail
The states that currently enforce some version of the convenience rule are: New York, Connecticut, Delaware, Nebraska, New Jersey, Oregon, Pennsylvania, and Alabama. Technical detail
The convenience of the employer rule can create an effective tax increase with no way to recover the cost. If New York taxes your income under the convenience rule and your home state's rate is lower, the credit your home state grants covers only its own tax rate on that income -- the difference between New York's rate and your home state's rate is an unreimbursed cost. States that currently enforce some version of this rule: New York, Connecticut, Delaware, Nebraska, New Jersey, Oregon, Pennsylvania, and Alabama.
Rental Property in Another State
Owning rental property in a state where you do not live is one of the most common triggers for multi-state filing, and the one most often overlooked.
Rental income from property located in another state is sourced to that state, period. If you live in Texas (no income tax) and own a rental property in California, you must file a California non-resident return reporting the rental income. California will tax you on the net income from that property at California's graduated rates as if it were your only income, then apply a tax rate based on your total worldwide income (the so-called "tax rate schedule" method that effectively applies your marginal rate). Technical detail
Several states require withholding at the source on rental income paid to non-residents. California requires property managers to withhold 7% of gross rent payments exceeding $1,500 per year for non-resident property owners. Cal. Rev. & Tax Code Section 18662; FTB Publication 1017 (Resident and Nonresident Withholding Guidelines). Pennsylvania requires withholding on non-resident income exceeding $5,000 per calendar year. 72 P.S. Section 7324. The withholding is a prepayment of tax -- you still file a return and settle the actual liability.
If you sell rental property in another state, the gain is sourced to that state. Many states impose withholding on the sale price or the gain. California withholds 3 1/3% of the total sale price from non-resident sellers at closing unless the seller obtains a withholding waiver. Cal. Rev. & Tax Code Section 18662(e)(3).
For taxpayers going through a divorce who receive rental property in another state as part of the property division, the state filing obligation follows the property. The transfer itself is generally tax-free under IRC Section 1041, but once you own the property and collect rent, you inherit the multi-state filing requirement. The prior owner's filing history is irrelevant; the obligation is yours from the date of transfer.
Remote Work Complications Beyond the Convenience Rule
Even in states without a convenience rule, remote work creates complexity. The fundamental problem is that most state tax systems were designed for a world where people lived and worked in the same place, or at most commuted across one state line.
The employer's state versus the worker's state. If you physically perform work in your home state, most states source that income to your home state, not the employer's state. But your employer may not know (or may not adjust) which state to withhold for. Many employers continue withholding for their headquarters state, leaving you to file a non-resident return in that state for a refund and pay your actual home state separately.
Temporary remote work and safe harbors. Several states enacted temporary provisions during the COVID-19 pandemic allowing remote work without triggering nexus. Most of those provisions have expired. A few states have adopted permanent safe harbors. Massachusetts, for example, now provides that non-residents who work remotely for a Massachusetts employer for fewer than 25 days per year are not subject to Massachusetts income tax on those days. Mass. Gen. Laws ch. 62, Section 5A, as amended by St. 2024 c. 240.
Tracking days. If you travel to multiple states for work during the year, you may owe taxes in every state where you perform services. Many states use a day-count allocation method: they divide your total days working everywhere into days working in their state, then tax that fraction of your income. This is particularly relevant for consultants, salespeople, and anyone with multi-state client responsibilities.
The Credit for Taxes Paid to Another State
The primary mechanism that prevents true double taxation is the resident state credit. Nearly every state with an income tax allows its residents to claim a credit for income taxes paid to other states on the same income. Technical detail
Here is how the credit works in practice. You live in Virginia and earn $50,000 of income sourced to Maryland. Maryland taxes you as a non-resident. Virginia taxes you as a resident on your worldwide income (which includes the $50,000). Virginia allows a credit for the taxes you paid Maryland on that $50,000, but the credit is limited to the lesser of (a) the tax actually paid to Maryland, or (b) the Virginia tax attributable to that income.
Where the credit falls short. If you owe tax to a non-resident state at a rate higher than your home state's rate, the credit covers only your home state's tax on that income. The excess paid to the other state is a net cost with no offset. If your home state's rate is higher, you pay the home state's rate -- the credit eliminates the non-resident tax, and you owe the difference to your home state. In theory you never pay less than the higher of the two rates.
Some states do not grant credits for taxes paid on certain types of income. A handful of states limit the credit to specific income types, or require that the income actually be "derived from sources" in the other state under that state's rules. If the non-resident state taxes you under the convenience rule on income you physically earned in your home state, your home state may argue it does not owe you a credit because the income was not truly sourced elsewhere.
- New York taxes full $200,000 under the convenience rule (up to 10.9% state + 3.876% NYC)
- Home state also taxes $200,000 as resident income at 5%
- Home state credit limited to 5% (the lesser of home state tax or tax paid to NY)
- Effective rate equals New York's rate -- home state credit does not cover the difference
- Employer provides written documentation that remote work is a business necessity, not employee convenience
- New York convenience rule does not apply when employer requires remote work
- Income sourced to home state only -- taxed at 5% flat
- No non-resident return required in New York
Not every state pursues non-resident tax revenue with equal vigor. Three states stand out for their audit activity, sourcing rules, and willingness to assert jurisdiction.
New York conducts over 3,500 residency audits annually, with average assessments exceeding $100,000 in back taxes, interest, and penalties. New York Department of Taxation and Finance, Nonresident Audit Guidelines (2021). New York applies the statutory residency test: if you maintain a "permanent place of abode" in New York for substantially all of the year and spend 184 or more days in the state, you are taxed as a resident on your worldwide income -- even if your domicile is elsewhere. Any part of a day counts as a full day. New York's top marginal rate (10.9% for state, plus New York City's 3.876%) gives auditors a strong financial incentive to assert residency.
California taxes non-residents on all California-source income using the effective marginal rate method described above. California's Franchise Tax Board is known for pursuing former residents who claim to have moved but maintain ties -- bank accounts, professional licenses, club memberships, voter registrations. California applies a "closest connections" test to determine domicile and will assert residency for partial years when the evidence of departure is weak. The top rate of 13.3% (the highest in the nation) makes California residency disputes among the most financially significant.
New Jersey applies its convenience rule reciprocally as of 2023 and taxes non-residents on all New Jersey-source income. New Jersey's top rate of 10.75% (on income over $1 million) makes it another high-stakes state for non-resident audits. Divorced taxpayers should note that New Jersey's "millionaire's tax" threshold applies per return, not per person -- a change in filing status after divorce can push previously below-threshold income into the top bracket.
The SALT Deduction Cap and Multi-State Filers
The Tax Cuts and Jobs Act of 2017 capped the federal deduction for state and local taxes (SALT) at $10,000. The One Big Beautiful Bill Act (OBBBA), signed in 2025, raised this cap to $40,000 for most filers ($20,000 married filing separately) for tax years 2025 through 2029, with a 1% annual inflation adjustment. OBBBA Section 100301 amends IRC Section 164(b)(6). The cap increases to $40,400 in 2026.
But the new $40,000 cap includes an income-based phaseout. The cap is reduced by 30% of the amount by which a taxpayer's modified adjusted gross income exceeds $500,000 ($250,000 for married filing separately). At $600,000 MAGI or above, the cap returns to $10,000. Technical detail
For multi-state filers, the SALT cap is particularly painful because you may be paying state income taxes to two or more states. A high-income earner living in New York and owning rental property in California might pay $30,000 to New York and $8,000 to California in state income taxes, plus $15,000 in property taxes -- $53,000 total. Under the new $40,000 cap (assuming income below the phaseout), they deduct $40,000 and lose $13,000 in deductions. If their income exceeds $600,000, the cap drops back to $10,000, and they lose $43,000 in deductions.
Multi-state filers who pay property taxes in more than one state are especially affected, since property taxes in every state count against the same single SALT cap.
Pass-Through Entity Tax Elections: The SALT Cap Workaround
More than 36 states have enacted pass-through entity tax (PTET) elections that allow partnerships and S-corporations to pay state income taxes at the entity level rather than on the individual owner's return. Technical detail
The mechanics: the pass-through entity elects to pay state income tax directly. The entity claims a federal deduction for the tax paid (reducing the income flowing to the partners or shareholders on their K-1s). The individual owners then receive a state tax credit on their personal returns for the taxes paid by the entity. The net effect is that the state income tax is deducted at the entity level (where there is no SALT cap) rather than on the individual return (where the cap applies).
For multi-state filers, PTET elections interact with the credit-for-taxes-paid-to-another-state in ways that require careful planning. If you are a partner in a business that elects PTET in its home state, and you live in a different state, your resident state must grant a credit for the entity-level tax paid to the other state. Most states do, but the mechanics and timing differ. Technical detail
More than 36 states now offer pass-through entity tax elections. For multi-state business owners with MAGI above $600,000, the individual SALT cap drops back to $10,000 regardless of the OBBBA increase. A PTET election can effectively restore full deductibility of state income taxes on pass-through income, saving $15,000 to $50,000 or more annually in federal taxes.
K-1 Income from Out-of-State Partnerships
Receiving a K-1 from a partnership or S-corporation that operates in another state is one of the most underappreciated triggers of multi-state filing. The income reported on your K-1 may be sourced to every state where the entity does business. A single K-1 from a large fund or partnership can generate filing obligations in a dozen or more states.
Each state where the entity has income typically requires the individual partner to file a non-resident return reporting their share of that state's income. Some states set minimum filing thresholds (a few hundred dollars of state-source income), but many do not. Technical detail
Many large partnerships address this by filing composite returns or withholding and remitting state taxes on behalf of their non-resident partners. When the partnership does this, you still need to claim the withheld amount on your home-state return as a credit. When it does not, you are responsible for filing in every state yourself.
The compliance cost is real. If you are a limited partner in a real estate fund that owns properties in eight states, you may need to file eight non-resident state returns in addition to your federal and home-state returns. At $200 to $500 per non-resident state return (typical CPA fees), the filing cost alone can run $1,600 to $4,000 before considering the tax itself. This is worth evaluating before investing in multi-state partnerships, particularly when the K-1 income may be small relative to the compliance burden.
For divorced taxpayers who receive partnership interests as part of a property settlement, the multi-state filing obligation transfers with the interest. If your former spouse handled a dozen state returns because of a fund investment, that filing burden is now yours.
Multi-state tax situations rarely resolve themselves correctly through default withholding. Employers withhold based on rules they understand (which may not match your situation), partnerships withhold conservatively, and property managers follow their state's rules without regard to your overall tax picture.
Three things every multi-state filer should verify annually:
Check reciprocity. If you live in one state and work in a neighboring state, confirm whether a reciprocity agreement applies. If it does, file the exemption form with your employer. If your employer has been withholding for the wrong state, file for a refund.
Claim every credit. Your home state almost certainly grants a credit for taxes paid to other states. The credit must be claimed -- it does not happen automatically. Calculate it for each non-resident state separately and ensure you are not leaving money on the table.
Evaluate PTET elections. If you have pass-through business income and your state offers a PTET election, run the numbers. The election must typically be made in advance (deadlines vary by state), so waiting until you file your return is too late.