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The Overview
If you practice in more than one state, your return looks nothing like the average filer's, and the rules behind it were not built for the way physicians actually work.
Locum assignments. Telemedicine across state lines. A second license one state over. A weekend of moonlighting shifts at a sister facility. Every one of those creates a filing footprint, and every state writes its own rules for what to file, when to file, and how the math reconciles back to your resident state.
Physician multi-state taxes are one of the most poorly covered topics on the internet, and one of the most common ways physicians overpay. Generalist preparers miss filings, miss credits, or run the same template across returns that need state level judgment. The result lands one of two ways: the physician overpays, or a state notice arrives months after the return was closed out.
This guide walks through what actually matters: source state rules, reciprocity, the credit for taxes paid to other states, what no income tax states do (and do not do) for a locum, and the state level traps that come up most often.
What This Guide Covers
The Patterns
How Physicians End Up Filing in Multiple States
Most physicians with multi-state returns did not set out to build one. It happens as a career develops.
The common patterns:
Locum tenens assignments across three to ten states a year
Telemedicine with patients across multiple state licenses from a single home office
W-2 employment with moonlighting shifts in a neighboring state
Practice expansion across a state line
A mid year relocation with income earned under both residencies
An out of state K-1 from a surgery center or syndication
A locum physician working five states often files six returns: one resident return plus five nonresident returns. Apportionment, sourcing, and credit mechanics differ in each state, which is why a return that looks correct federally can be wrong in three states at the same time.
Return Types
Resident, Nonresident, and Part Year Returns
Every physician filing across state lines is working with one of two return types, and most are working with both.
Resident return
Your resident state is where you maintain your domicile: driver license, voter registration, family home, school enrollment, time in state. Your resident state taxes all of your income, regardless of where it was earned.
Nonresident return
A nonresident return is filed in any state where you earned income but did not live. It taxes only the income sourced to that state. For locum work, that is the income at a specific assignment.
Part year resident return
If you moved during the year, you may file part year resident returns in both states. Each state taxes the income earned while you were a resident there. Sourcing is by date, not work location.
The interaction between the resident and nonresident returns is where the planning happens. Without a credit mechanism, the same income would be taxed by both states. That credit, covered below, is what keeps the math from running double.
Sourcing
Source State Rules and Physical Presence
The general rule: you owe tax to any state where you physically earn income, even if you live somewhere else. The state where the work happens is the source state for that income.
Two weeks of physician services on the ground in California are sourced to California. The hospital may withhold California tax on a W-2, the staffing agency may issue a 1099 with the California allocation, or both. Either way, California has source state income for those two weeks.
Some states have minimum income thresholds before nonresident filing is required. Others do not. California has no de minimis threshold and treats one day of work as a filing obligation.
What counts as source state income: W-2 wages earned while physically present in the state, 1099 income for services performed in the state, K-1 income from an entity operating in the state (allocated under the entity's apportionment formula), and bonuses tied to work performed in the state even when paid later. Investment income, dividends, and retirement distributions are generally sourced to your resident state.
Reciprocity
Physician Reciprocity Agreements
A reciprocity agreement is a deal between two neighboring states: residents of state A working in state B are taxed only by their resident state. These agreements exist primarily in the Northeast and Midwest, between states with heavy daily cross border commuting.
States with active reciprocity agreements
As of the current tax year, the following states (plus the District of Columbia) have active reciprocity agreements with at least one neighbor: District of Columbia, Illinois, Indiana, Iowa, Kentucky, Maryland, Michigan, Minnesota, Montana, New Jersey, North Dakota, Ohio, Pennsylvania, Virginia, West Virginia, and Wisconsin. Reciprocity is bilateral and pair specific, not statewide.
The most common pairs that come up for physicians:
District of Columbia, Maryland, and Virginia (the DC metro triangle)
Pennsylvania with New Jersey, Ohio, Virginia, West Virginia, Maryland, and Indiana
Illinois with Iowa, Kentucky, Michigan, and Wisconsin
Indiana with Kentucky, Michigan, Ohio, Pennsylvania, and Wisconsin
Kentucky with Illinois, Indiana, Michigan, Ohio, Virginia, West Virginia, and Wisconsin
Michigan with Illinois, Indiana, Kentucky, Minnesota, Ohio, and Wisconsin
Minnesota with Michigan and North Dakota
Ohio with Indiana, Kentucky, Michigan, Pennsylvania, and West Virginia
Virginia with DC, Kentucky, Maryland, Pennsylvania, and West Virginia
West Virginia with Kentucky, Maryland, Ohio, Pennsylvania, and Virginia
States without reciprocity agreements include California, New York, Connecticut, Massachusetts, Texas, and Florida. The New York and New Jersey pair, despite the volume of daily cross border work between them, has no reciprocity agreement. Physicians commuting between New York and New Jersey withhold in both states and reconcile on the resident state return through the credit for taxes paid to other states.
What reciprocity does not change
Reciprocity is narrow. It typically covers W-2 wage income only, not 1099 or K-1 income. A locum physician working in a reciprocity state under a 1099 contract still owes a nonresident return in the source state. A practice owner with a multi-state PLLC does not get reciprocity on K-1 income.
Reciprocity also does not cover local or municipal taxes. Pennsylvania local Earned Income Tax, Ohio municipal tax, New York City taxes, and Maryland county piggyback taxes apply regardless of state level reciprocity.
How it is claimed
The employee files a nonresidency certificate with the work state employer, who then withholds resident state tax instead of work state tax. Common forms include Pennsylvania REV-419, New Jersey NJ-165, Ohio IT 4NR, Maryland MW507, Virginia VA-4, West Virginia WV/IT-104R, Kentucky 42A809, Indiana WH-47, Michigan MI-W4, Wisconsin W-220, and Illinois IL-W-5-NR. If the certificate is not filed, the wrong state withholds and the physician files a nonresident return in the work state to recover the withholding, which adds complexity rather than removing it.
The list of state pairs with active reciprocity agreements changes over time and should be confirmed at the time of filing.
The Key Mechanism
Credit for Taxes Paid to Other States
For most physicians, reciprocity does not apply. The protection against double taxation comes from the credit for taxes paid to other states, built into every state income tax system that has one.
Your resident state taxes your worldwide income. You file nonresident returns in each source state and pay tax there on the income sourced to that state. On the resident state return, you claim a credit for tax actually paid to the other states.
The credit is capped
Work State Rate Is Higher
The credit offsets your resident state tax on that income but does not refund the difference.
Work State Rate Is Lower
The credit does not cover the full source state tax.
It cannot exceed what your resident state would have charged on the same income. If you work in a higher tax state than your resident state, the credit offsets your resident state tax on that income but does not refund the difference. If you work in a lower rate state, the credit does not cover the full source state tax.
The Net Effect
Either way, you pay roughly the higher of the two rates on that income. This cap is the source of the most common multi-state surprise, and it cuts in both directions.
Order of operations matters
The credit is claimed by attaching the nonresident return, or proof of nonresident tax paid, to the resident state return. Filing late in the source state can delay the credit in the resident state.
The Locum Myth
No Income Tax States and What They Actually Do for a Locum
Nine states currently have no state income tax: Alaska, Florida, Nevada, New Hampshire (limited tax on dividends and interest, being phased out), South Dakota, Tennessee, Texas, Washington, and Wyoming. Each state's tax treatment should be confirmed at the time of filing because state law changes.
Alaska
Florida
Nevada
New Hampshire
South Dakota
Texas
Washington
Wyoming
Here is the math that surprises locum physicians: working a Texas assignment while living in California does not relieve you of California tax. California taxes worldwide income on its residents. The Texas assignment generates no source state tax, but California still taxes the income at California rates with no credit offset, because there was no source state tax to credit against.
Working in a no tax state is only a benefit if you also live in one.
Relocating to a no tax state is real planning, not a paper move. State residency is a facts and circumstances determination: driver license, voter registration, home ownership, family location, time spent in state, and state of professional licensure all matter. High tax states, particularly California and New York, audit residency changes aggressively.
Where It Shows Up
Multi-State Filings Are Where the Difference Between Preparers Shows Up
Multi-state physician returns require a tax team that understands physician income patterns, state sourcing, reciprocity, the credit cap, and state level traps. Filing in five states is not five times the work. It is a different category of work.
Doc Wealth handles physician multi-state taxes for clients in all 50 states as part of year round physician tax planning.
Watch Outs
State Level Traps
A handful of states have rules that catch physicians off guard.
California
No de minimis threshold. One day of physician services performed in California triggers a nonresident filing on that income
Aggressive residency audits. California pursues former residents who claim a residency change but keep meaningful California connections
High marginal rates, capped credit. Income sourced to California is taxed at California rates with no credit recovery for non California residents
Entity restrictions. California does not permit LLCs or PLLCs for the practice of medicine. California physicians must use a Professional Corporation
New York
Convenience of the employer rule. If your employer is in New York and you work remotely from another state for your own convenience rather than the employer’s necessity, New York may still tax the income as New York source. This affects telemedicine physicians, remote consulting physicians, and any physician with a New York employer who works from home elsewhere
New York City Unincorporated Business Tax (UBT). Physicians practicing in New York City as sole proprietors or through partnerships may owe approximately 4% UBT on top of state and federal tax
Aggressive sourcing on partnership and S-Corp income. Income from entities with New York operations is apportioned under rules that often produce more New York income than physicians expect
Other states to watch
Oregon and several other states apply rules similar to New York’s convenience of the employer rule for remote work
New Jersey has a high marginal rate and a Pass-Through Business Alternative Income Tax that may be worth electing for practice owners
Texas has no state income tax but imposes a franchise (margin) tax on entities above a revenue threshold
Remote Care
Telemedicine and Remote Work
Telemedicine creates a sourcing question that most generalist preparers handle wrong, because the federal rules predate the way modern virtual care is delivered.
If you are physically located in your home state and provide a virtual consultation with a patient in another state, where is the income sourced? In most cases the answer is your home state, because the service is performed there. A few states take a different view, particularly New York under the convenience of the employer rule.
What to confirm before the return is filed: whether your employer or platform sources income to your location or the patient location, whether the states you are licensed in but not physically present in expect a filing, and how your specific arrangement allocates income. Holding a medical license in five states does not by itself create a filing obligation in those states. The filing obligation follows the income and the work location, not the license.
Structure
Entity Structure and Multi-State Filings
The way your physician business is structured changes the multi-state picture.
Sole proprietor or single member LLC
All income flows to your personal return and is sourced by where the work was performed. Each source state generates a personal nonresident filing.
S-Corp
Income flows through to your personal return on a K-1, but the S-Corp itself may have nexus and entity level filing obligations in source states. State apportionment determines how much S-Corp income lands in each state. State payroll filings are required for any state where you take W-2 wages. Most multi-state locum physicians who elect S-Corp end up with both entity level and personal level filings in their work states.
PLLC and Professional Corporations
Practicing across state lines adds entity and registration questions to your tax planning. We work with our legal partners to review the requirements in your practice states and walk you through any needed formation or registration, keeping the setup connected to your multistate tax plan.
For deeper coverage of entity decisions, see our physician entity formation page. For the quarterly side across multiple states, see our physician estimated taxes guide.
Why Doc Wealth
How Doc Wealth Handles Multi-State Physician Returns
If you have ever filed a return across three states and watched a notice arrive four months later for one of them, you know the problem is not the work itself. It is the coordination. Multi-state filings expose the difference between a generalist preparer and a tax team that works exclusively with physicians.
A 1099 anesthesiologist filing across four states often saves $30,000 to $80,000 once nonresident filings, the credit calculation, and entity level state filings are sequenced correctly. The math is not in the strategy. It is in the order of operations.
What this looks like at Doc Wealth:
Your full filing footprint is mapped before the year ends. We know which states require filings, where reciprocity applies, and where the credit cap will create surprises
Estimated payments are coordinated across federal, resident state, and source states
Nonresident filings are sequenced to flow correctly through the resident state credit calculation
State level traps in California, New York, and other aggressive states are flagged before the work is accepted
Telemedicine sourcing is analyzed against your specific employer or platform arrangement
We coordinate business state tax returns with your personal nonresident returns and work with our partners on any related entity setup.
This work is built into year round physician tax planning, not billed separately. Our physician CPA team includes Tax Attorneys, CPAs, and Enrolled Agents handling physician returns in all 50 states. We work with 1099 physicians and locum tenens physicians who routinely file in three to ten states a year.
Answers
Frequently Asked Questions
Have a question that's not here? Your discovery call is the right place to ask. 15 minutes, no obligation.
01
Do I have to file a tax return in every state I worked in this year?
01
Do I have to file a tax return in every state I worked in this year?
Generally yes, if you earned income for work performed in that state and the state has an income tax. A handful of states have minimum income thresholds before nonresident filing is required, but most do not. California has no de minimis threshold. Reciprocity agreements may eliminate filing in narrow cases, primarily for W-2 wage income between neighboring states.
02
Will I be taxed twice on the same income?
02
Will I be taxed twice on the same income?
In most cases, no. The credit for taxes paid to other states, claimed on the resident state return, prevents double taxation. The credit is capped at the amount of resident state tax that would have been owed on the same income, so if you work in a higher tax state than your resident state, the credit offsets the resident state tax but does not refund the difference. Either way, you pay roughly the higher of the two rates.
03
What if I only work in a state with no income tax?
03
What if I only work in a state with no income tax?
If you live in a no income tax state and work in a no income tax state, you owe no state income tax. If you live in a state with an income tax and work in a no income tax state, your resident state still taxes the income at full resident state rates. The no tax status helps only on the source state side.
04
How does telemedicine affect multi-state filing?
04
How does telemedicine affect multi-state filing?
In most cases, telemedicine income is sourced to the state where the physician is physically located when providing the service, not to the patient state. A few states, particularly New York, apply different rules under the convenience of the employer rule. Holding a medical license in a state does not by itself create a tax filing obligation there.
05
Do reciprocity agreements help locum tenens physicians?
05
Do reciprocity agreements help locum tenens physicians?
Usually not. Reciprocity agreements typically cover W-2 wage income only, and most locum income is paid through 1099 or S-Corp structures. Locum physicians in a reciprocity state pair will generally still file nonresident returns in their work states.
06
How does an S-Corp affect multi-state filings?
06
How does an S-Corp affect multi-state filings?
An S-Corp adds a layer of state filings. The entity itself may have nexus in source states and require entity level filings. Wages paid through the S-Corp generate state payroll filings in any state where wages are sourced. K-1 income still flows to your personal return for resident and nonresident sourcing.
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This material is intended for educational and informational purposes only and does not constitute tax, legal, accounting, or financial advice. The content is general in nature and may not apply to your specific circumstances. Tax laws and financial regulations are subject to change and interpretation, and the application of these laws can vary based on individual situations. Before making any decisions, you should consult with a qualified tax advisor, legal counsel, or financial professional.