Airline Crew and the Federal Residency Exemption Most Pilots Miss

Every crew member has a domicile. It is printed on the bid award, it decides which trips are available, and it is the reason a first officer commutes from Boise to Chicago on a jumpseat twice a month. In aviation the word is plain: a domicile is a base where an airline keeps a permanent flight crew, and work schedules begin and end there. Airlines use it interchangeably with base, awards run by seniority, and a crew member holds exactly one at a time.

In state tax law the same word means the place you intend as your true, fixed, permanent home, and to which you intend to return whenever you are away. It has nothing to do with where your trips start. A pilot can hold a JFK domicile and be a Texas tax domiciliary, or hold a DFW domicile and be a California tax resident, and both of those sentences are ordinary rather than clever.

The collision between those two meanings is where crew tax problems start, and it gets worse because a federal statute sits in the middle of it. Most crew members have heard that there is a federal law protecting them from state income tax. There is. It is 49 U.S.C. section 40116(f), and it is real, narrow, and almost universally misdescribed. It does not exempt anyone from state income tax. It concentrates the entire question into one state and then leaves that state free to fight you about whether it is the right one.

This article is informational and is not legal or tax advice. Crew residency turns on the specific facts of where you actually live, what you keep, and what your schedule looks like, and it interacts with the rules of each state involved. Work through your own situation with a qualified CPA or tax attorney.

The operative language is short enough to read in full, which is worth doing because the summaries drop the half that matters.

Section 40116(f)(2): "The pay of an employee of an air carrier having regularly assigned duties on aircraft in at least 2 States is subject to the income tax laws of only the following: (A) the State or political subdivision of the State that is the residence of the employee. (B) the State or political subdivision of the State in which the employee earns more than 50 percent of the pay received by the employee from the carrier."

Section 40116(f)(1)(C) then supplies the measuring rule: "an employee is deemed to have earned 50 percent of the employee’s pay in a State or political subdivision of a State in which the scheduled flight time of the employee in the State or subdivision is more than 50 percent of the total scheduled flight time of the employee when employed during the calendar year." Paragraph (1) also defines "pay" as money received by an employee for services, and "State" to include the District of Columbia and a territory or possession of the United States.

A third paragraph, added in 1994 by Public Law 103-305, extends the same two-state limit to compensation paid during authorized leave to perform services for the employee’s airline union, measured by where the employee’s scheduled flight time would have been more than 50 percent had they been flying full time.

That is the whole exemption. Notice what it is: a limit on how many states may reach your flight pay. It is not a rate reduction, not a credit, and not an exclusion of income. Nothing in it says a crew member pays less tax. It says fewer states get to ask.

Subparagraph (B) is the famous one. It is why a flight attendant who works out of LaGuardia and lives in Charlotte does not file thirty nonresident returns for the thirty states she overflew. Without the federal rule, ordinary duty-day sourcing would let every state she worked in claim a slice. With it, almost none of them can.

Subparagraph (A) is the one that gets skipped, and it is unconditional. Your state of residence taxes your pay. There is no percentage, no flight-time test, and no carve-out. If you are a resident of a state with an income tax, that state taxes one hundred percent of your airline compensation, and section 40116 has nothing to say about it.

Put the two together and the practical effect of the federal statute is the opposite of an exemption. It removes every other state from the argument and leaves exactly one question standing: which state are you a resident of? For a crew member domiciled in Texas or Florida, the answer produces a zero. For a crew member whose residency is genuinely contested, the federal statute has just guaranteed that the entire year of compensation rides on the outcome of that single contest, with no apportionment to soften it.

That is the sentence worth rereading. Section 40116 does not reduce crew exposure. It concentrates it.

The protection attaches to an "employee of an air carrier having regularly assigned duties on aircraft in at least 2 States." Three separate conditions live in that phrase, and each of them excludes somebody who thinks they are protected.

First, air carrier. Title 49 defines it at section 40102(a)(2) as "a citizen of the United States undertaking by any means, directly or indirectly, to provide air transportation." A company that flies its own executives in its own aircraft is not providing air transportation to the public, which is why corporate flight department crews have repeatedly had to ask state revenue agencies whether the carve-out reaches them. It is a live question for a Part 91 corporate pilot in a way it simply is not for a Part 121 airline pilot.

Second, regularly assigned duties on aircraft. The words do the obvious work. Mechanics, dispatchers, gate agents, ramp crews, reservations staff, and headquarters employees work for air carriers and do not have regularly assigned duties on aircraft. They are taxed like every other employee, by the state where they work and the state where they live. A crew scheduler at a Chicago hub gets no federal shield.

Third, in at least 2 States. A crew member whose flying is entirely intrastate is outside the provision.

There is also a small structural oddity in the text worth understanding before anyone builds a plan on it. Paragraph (1)(C) deems an employee to have earned 50 percent of pay in a state where more than half of scheduled flight time occurs, while paragraph (2)(B) allows taxation only where the employee earns more than 50 percent of pay. Read literally, the deeming clause alone lands exactly on the line rather than over it, and any additional compensation attributable to that state has to carry it the rest of the way. States administer the provision as a flight-time test rather than parsing that gap. California’s Franchise Tax Board states the rule as: "Pursuant to 49 U.S.C. Section 40116(f)(2)(B), California does not tax the wages of a nonresident airline employee (i.e., pilot, copilot, flight attendant) unless more than 50 percent of the individual’s scheduled flight time is in California."

And one more limit that costs people real money: the statute protects "pay received by the employee from the carrier." It does not touch rental income, a spouse’s wages, a side business, a capital gain, or a stock sale. A pilot with a genuinely protected paycheck can still have an unprotected everything else.

Ask a crew member which state holds more than half their scheduled flight time and the honest answer is usually none. Flight time accrues in the air, over a route, and a domestic narrowbody flying transcon legs spreads its minutes across a dozen states in a day. Even a crew member who never leaves one carrier’s regional network is unlikely to book more than half a calendar year’s scheduled flight time inside a single state’s airspace.

That is why the practical answer for most crew is that subparagraph (B) never applies to anyone, and subparagraph (A) is the whole statute. Where the test does fire, states apply an allocation rather than taxing everything. California’s formula is arithmetic: total wages multiplied by scheduled flight time in California over total scheduled flight time equals California source wages.

It is worth knowing that Congress gave other mobile workforces a cleaner version of the same idea. Under 49 U.S.C. sections 11502(a) and 14503(a), the wages of nonresident railroad employees and interstate truck drivers who regularly work in two or more states are sourced to the state of residence, full stop, with no percentage test at all. Aviation got a two-pronged rule instead of a one-pronged one. In day to day practice the results converge, because the second prong so rarely triggers, but crew should not assume the rail and trucking shorthand is their rule. It is not their statute.

The clearest illustration of what section 40116 does not do is a case decided before most current crew were born, and it has never stopped being the right teaching example.

Henry Berger had been a pilot for Braniff Airways since 1942. He was based in Miami from 1959 until December 1967, when at his own request he transferred to California to fly military charters from Travis Air Force Base to Southeast Asia under a Braniff contract with the United States government. The contract had an original one-year term, from July 1966 to June 1967, and was renewed annually until it finally terminated in 1972. Nobody promised Berger how long the California assignment would last.

His ties ran in both directions, and the list reads like a modern crew member’s. He gave up the furnished Florida apartment that had been his only Florida residence after a 1965 legal separation, and the divorce decree gave the Florida home to his former spouse. In California he took a one-year lease on an unfurnished apartment in Kentfield and bought furniture locally, then a year-to-year lease in Tiburon with a clause letting him terminate on transfer. He bought a car in California in 1968, registered it there, and got a California driver’s license. He remarried in 1968, to a California resident. He flew roughly twelve days a month and split the rest of his time about equally between California and Florida, with the Florida trips largely devoted to winding up his divorce and disposing of investments. He voted in Florida in 1968. He kept a Florida savings account, carried a loan at a Florida bank, named that bank executor in his will, and kept his membership in a Masonic lodge in Coral Gables.

He filed nonresident California returns for 1968 and 1969. The Franchise Tax Board said he was a resident and assessed $3,656 and $3,654. The State Board of Equalization sustained the assessments on May 8, 1973.

The sentence that matters is one line of the opinion: "In the present case it is conceded that appellant is a domiciliary of Florida, but domicile is not determinative of residence for income tax purposes." California’s definition of resident under Revenue and Taxation Code section 17014 reaches every individual in the state for other than a temporary or transitory purpose, and the Board leaned on the regulation’s companion sentence, that an individual in the state "employed in a position that may last permanently or indefinitely" is there for other than a temporary or transitory purpose "and, accordingly, is a resident taxable upon his entire net income even though he may retain his domicile in some other state or country." Two companion appeals by other Braniff pilots on the same contract, Christianson and MacInnes, had already held that the annually renewed contract "was in reality a contract of indefinite duration."

Nothing about that outcome would change today. Section 40116 tells California it may tax the pay of a resident. Berger lost on whether he was one.

The modern case is worse, because it ended in criminal convictions.

Randall Enyeart was a commercial pilot for Northwest Airlines. Minnesota prosecuted him on the theory that he had constructed the appearance of Alaska residency to avoid Minnesota tax. He was convicted of one count of filing fraudulent returns for 1998, two counts of tax evasion for 1999 and 2000, and two counts of failing to pay motor vehicle taxes.

The evidence is the part crew should sit with. The state assembled flight schedules, bank records, Federal Aviation Administration records, court documents, cell phone records, voter registration, driver’s license status, property records, and testimony about letters he had drafted. The single most quoted item is the ATM data: roughly 240 transactions in Minnesota against 3 in Alaska. Nobody had to prove where Enyeart intended to live. His card told the story for him.

On appeal he argued, among other things, that 49 U.S.C. section 40116 preempted Minnesota’s method of calculating days spent in the state. The Minnesota Court of Appeals rejected it in State v. Enyeart, 676 N.W.2d 311, decided March 23, 2004. The court drew the distinction this entire article is built around: the federal statute limits which states may tax an air carrier employee’s pay, and says nothing about how a state defines residence. Minnesota’s residency rule turns on physical presence, not on flight time or compensation allocation, so it addresses a different question. The court also observed that Minnesota’s own exclusion of short transit stays actually served the federal purpose by keeping employees with minimal contact out of the net, and it found no irreconcilable conflict between Minn. Stat. section 290.01, subdivision 7 and the federal statute. It separately held that the state’s 26-factor domicile rule, Minn. R. 8001.0300, was not unconstitutionally vague.

Minnesota’s statute is worth reading alongside it, because its structure is common. A resident is any individual domiciled in Minnesota, or an individual domiciled elsewhere who "maintains a place of abode in the state and spends in the aggregate more than one-half of the tax year in Minnesota." Presence for any part of a calendar day counts as a day. And abode is defined broadly: "a dwelling maintained by an individual, whether or not owned by the individual and whether or not occupied by the individual."

Read that last clause with a crash pad in mind.

Almost no crew member loses on the federal statute. They lose on a state statutory residency test, and the fact pattern is nearly always the same: a place to sleep near the base, plus more days on the ground in that state than they thought they had.

New York is the sharpest version because it runs both prongs hard. Tax Law section 605(b)(1)(B) taxes a person who is not domiciled in New York as a statutory resident on worldwide income if they maintain a permanent place of abode in New York for substantially all of the taxable year and spend more than 183 days of the year in New York. Both prongs must be met, and exactly 183 days does not trigger the test. Since 2022 the Tax Department’s audit guidelines define "substantially all of the taxable year" as a period exceeding 10 months, down from 11, which slightly widens the net for an abode held for part of a year.

The day-counting rule is the one that punishes crew. Under 20 NYCRR 105.20(c), "presence within New York State for any part of a calendar day constitutes a day spent within New York State, except that such presence within New York State may be disregarded if such presence is solely for the purpose of boarding a plane, ship, train or bus for travel to a destination outside New York State, or while traveling through New York State to a destination outside New York State."

Crew members read that exception and assume it was written for them. Look at it again. It disregards presence that is solely for boarding or passing through. A crew member working a New York departure is not present solely to board a plane for travel; they are present to work, and the trip is their job rather than their journey. New York counts a layover as a day. A four-day trip that starts and ends at a New York base can put four days on the New York side of the ledger for what feels like one commute plus flying, and thirty of those trips is not a hypothetical way to pass 183.

Illinois runs a quieter test with a different shape and its own trap. Under 35 ILCS 5/1501(a)(20)(A) a resident is someone in Illinois for other than a temporary or transitory purpose, or domiciled in Illinois and absent for a temporary or transitory purpose, with no day-count threshold and no abode prong at all. In place of a bright line, 86 Ill. Adm. Code 100.3020(f) supplies rebuttable presumptions, and two of them read like they were written about commuting crew: an individual who spends more than nine months of a taxable year in Illinois is presumed to be a resident, and an Illinois resident in one year is presumed to be one the next "if he or she is present in Illinois more days than he or she is present in any other state." A crew member holding an O’Hare or Midway base who keeps a crash pad and commutes home to a state where they are rarely present can trip that second presumption without ever crossing a stated threshold, and the presumptions yield only to clear and convincing evidence.

The mirror image is worth knowing too. In Cain v. Hamer, 2012 IL App (1st) 112833, 975 N.E.2d 321, retirees who declared Florida domicile in 1995 and then spent 1,666 days in Illinois against 1,700 in Florida from 1996 through 2004, an average above 183 Illinois days a year, were held to be Florida residents, with roughly $1.9 million at stake. Illinois residency is not decided by a day count. It is decided by purpose, evidenced by everything else, and Illinois auditors reconstruct day counts from credit card statements, toll records, airline records, and utility usage while cross-checking the General Homestead Exemption against a claimed out-of-state domicile.

If you are weighing which state to actually live in rather than which base to bid, the domicile state chooser walks the questions that separate these outcomes, including whether you still keep a place in the state you are trying to leave.

The reason so many crew members live in Texas and Florida is not folklore, and given how section 40116 works it is close to arithmetic. Subparagraph (A) hands your state of residence the whole paycheck. A state with no income tax takes nothing.

Texas has no individual income tax and therefore no day-count test, no statutory residency test, and no residency-factor audit of the kind New York and California run. DFW and IAH are major crew bases for American and United, and Dallas Love Field is Southwest’s headquarters, so for a large number of crew the tax answer and the commuting answer point the same direction. A Texas-domiciled crew member who never crosses the 50 percent flight-time threshold in another state owes no state tax on flight pay at all. Crew moving from New York to Texas or moving from Illinois to Texas are making that exact trade, and the audit risk on the move sits entirely with the state they left.

Florida works the same way with different scenery: no income tax, no statutory day-count test, no state return that turns on residency status, and major bases at Miami, Fort Lauderdale, and Orlando. Florida adds one thing Texas does not. Under Fla. Stat. section 222.17 a person who has established a Florida domicile may file a sworn declaration of domicile with the clerk of the circuit court, creating a dated, recorded, public statement of intent. It is not required and it does not bind any other state, but it is a document with a date on it, which is more than a bid award will ever be. For crew already in a no-tax state and choosing between them, moving from Texas to Florida is a lifestyle decision rather than a tax one, and the residency file is the only thing that changes.

Now the part that gets skipped. Neither state will ever defend you. Because neither taxes income, neither runs a residency audit, neither issues a determination that you are a resident, and neither has any interest in the outcome of a fight with New York, Illinois, or California. Every dollar of exposure in a crew residency arrangement sits with the state you left or the state you keep sleeping in. Your new state supplies evidence. It never supplies a defense.

And both states run a cross-check that catches two-address arrangements. Florida’s section 196.161 exposes a person who keeps claiming the homestead exemption after establishing residency elsewhere to back taxes, penalties, and a lien, and county property appraisers actively compare driver’s license, voter registration, and out-of-state tax filings. Texas Tax Code section 11.13(h) is explicit that a person may not receive a residence homestead exemption for more than one residence homestead in the same year, section 11.43(h) directs the chief appraiser to investigate and cancel a previously allowed exemption on learning of any reason it should be canceled, and section 11.43(i) adds an exemption erroneously allowed in any one of the five preceding years back to the appraisal roll as escaped property. A homestead exemption is a sworn statement about which property is your principal residence. Leaving one behind in the state you left is the single most efficient way to contradict yourself in writing.

Crew have an evidence problem that is genuinely different from a normal taxpayer’s, and it cuts both ways. The bad news is that a schedule generates presence in states you never chose, at hours nobody records, and a crash pad can satisfy an abode test without ever feeling like a home. The good news is that the industry documents your movements more precisely than almost any other job, and most of that documentation is retrievable while it is current and gone by the time an auditor asks.

Keep the schedule records themselves. Bid awards, monthly line assignments, trip pairings, actual flown reports, and hotel assignments together reconstruct where your body was on which calendar day. Minnesota built a criminal case on flight schedules and card data. The same category of record is what defends you, and it exists only if you save it as it is issued.

Count ground days by state, not flight hours. Every test that decides your residency counts days of physical presence. None of them counts block time. A crew member who tracks flight hours and assumes the day count follows is measuring the wrong thing.

Be honest about the crash pad. It is an abode under most state definitions whether you own it, share it, or rarely sleep in it, and Minnesota’s statute says so in plain words. If you hold one near a base in a state with a statutory residency test, the abode prong is likely satisfied and your entire protection is the day count. That is a thin place to stand without records.

Document the state you claim as home, continuously. A driver’s license, voter registration, vehicle registration, a home you actually pay for and return to, local medical and financial relationships, and, in Florida, a recorded declaration of domicile. Berger kept a Florida bank, a Florida vote, and a Florida lodge membership and still lost, because the everyday facts of his life pointed at California. The file has to reflect where you actually live, not where you would prefer to be from.

Remove the homestead exemption you left behind, and check whether your payroll state matches your claimed residence. Crew payroll is often coded to the base rather than the residence, and a W-2 that names a state you say you do not live in is an invitation to a letter.

Build it while the year is happening. Every record listed above is cheap to capture on the day it exists and impossible to reconstruct honestly two years later.

The Mobility Map records days and nights across states as they happen, measured against each jurisdiction’s own day-count threshold, which for a crew member is the specific thing a bid package does not tell you and an auditor will ask about first. Evidence Vault holds the schedule records, lease and crash pad documents, license and registration records, and declarations that turn a claimed residence into a demonstrated one. AuditIQ surfaces thin days and retained-tie exposure in the states you actually spend time in, including the base state you commute to, and advisor sharing lets a CPA or tax attorney review the chronology and the underlying documents directly.

ResidencyIQ organizes records and highlights potential exposure factors. It is not a law firm or an accounting firm and does not provide legal or tax advice; work with a qualified CPA or tax attorney on your own domicile, filings, and state exposure.

49 U.S.C. section 40116 is the source of all statutory language quoted here, including subsection (f)(1)(A) defining "pay," (f)(1)(B) defining "State" to include the District of Columbia and a territory or possession, (f)(1)(C)’s deeming rule tied to more than 50 percent of total scheduled flight time, (f)(2)(A) and (f)(2)(B) limiting taxation to the state of residence and the state where more than 50 percent of pay is earned, and (f)(3) covering authorized airline union leave, which was added by Public Law 103-305, title II, section 208: https://uscode.house.gov/view.xhtml?req=granuleid%3AUSC-prelim-title49-section40116. The definition of "air carrier" as "a citizen of the United States undertaking by any means, directly or indirectly, to provide air transportation" is at 49 U.S.C. section 40102(a)(2): https://www.law.cornell.edu/uscode/text/49/40102.

California Franchise Tax Board, Residency and Sourcing Technical Manual (Rev. 01/2026), section 3215, Allocation of Compensation, is the source of the Airline Employees rule quoted here, of the California allocation formula (total wages multiplied by scheduled flight time in California over total scheduled flight time), and of the parallel treatment of nonresident railroad employees and truck drivers under 49 U.S.C. sections 11502(a) and 14503(a), whose wages are sourced to the state of residence: https://www.ftb.ca.gov/tax-pros/procedures/residency-and-sourcing-technical-manual-disclosure.pdf.

Appeal of Henry C. Berger, 73-SBE-029 (California State Board of Equalization, May 8, 1973), is the source of the Braniff pilot facts described here: employment since 1942, the Miami base from 1959 to December 1967, the requested transfer to fly military charters from Travis Air Force Base under an annually renewed Braniff government contract, the Kentfield and Tiburon leases, the 1968 California car purchase and driver’s license, the 1968 remarriage to a California resident, the roughly 12 days a month of flying with the balance split about equally between California and Florida, the 1968 Florida vote, the Florida savings account and bank loan, the bank named as executor, the Coral Gables Masonic lodge, the $3,656 and $3,654 assessments for 1968 and 1969, the quoted holding that "domicile is not determinative of residence for income tax purposes," the quoted regulation language on employment that "may last permanently or indefinitely," and the companion appeals of Christianson and MacInnes holding the annually renewed contract "was in reality a contract of indefinite duration": https://ota.ca.gov/wp-content/uploads/sites/54/2022/02/73-sbe-029.pdf.

State v. Enyeart, 676 N.W.2d 311 (Minn. Ct. App., decided March 23, 2004), is the source of the Northwest Airlines pilot facts, the Alaska residency claim, the convictions for filing fraudulent returns and tax evasion and failure to pay motor vehicle taxes, the categories of evidence including flight schedules, bank records, FAA records, cell phone records and the roughly 240 Minnesota ATM transactions against 3 in Alaska, the 26-factor domicile rule at Minn. R. 8001.0300, and the holding that Minn. Stat. section 290.01, subdivision 7 is not in irreconcilable conflict with, and therefore not preempted by, 49 U.S.C. section 40116: https://caselaw.findlaw.com/court/mn-court-of-appeals/1275702.html.

Minnesota Statutes section 290.01, subdivision 7, is the source of the Minnesota resident definition quoted here, including the abode-plus-more-than-half-the-tax-year prong, the rule that presence for any part of a calendar day counts as a day, and the definition of abode as "a dwelling maintained by an individual, whether or not owned by the individual and whether or not occupied by the individual": https://www.revisor.mn.gov/statutes/cite/290.01.

N.Y. Comp. Codes R. & Regs. tit. 20, section 105.20, is the source of the statutory residency language in subsection (a)(2) and of the day-counting rule and travel exception quoted in full from subsection (c): https://www.law.cornell.edu/regulations/new-york/20-NYCRR-105.20.

Simple Flying, "What Is A Domicile In Commercial Aviation Terms?" by Mark Finlay (May 13, 2023), is the source of the aviation industry definition of a domicile as a base where an airline keeps a permanent flight crew, with work schedules beginning and ending there, and of the point that desirable bases are awarded by seniority: https://simpleflying.com/what-is-a-domicile-in-commercial-aviation-terms/.

The New York statutory residency test under Tax Law section 605(b)(1)(B) and the 2022 change defining "substantially all of the taxable year" as a period exceeding 10 months, the Illinois resident definition at 35 ILCS 5/1501(a)(20)(A) and the rebuttable presumptions at 86 Ill. Adm. Code 100.3020(f) with their clear and convincing rebuttal standard, Cain v. Hamer, 2012 IL App (1st) 112833, 975 N.E.2d 321 and its day counts and amount at issue, the Illinois audit reconstruction methods and General Homestead Exemption cross-check, the Texas and Florida crew base and no-income-tax profiles, the Florida declaration of domicile under Fla. Stat. section 222.17 and homestead exposure under section 196.161, and the Texas homestead rules at Tax Code sections 11.13(h), 11.43(h), and 11.43(i) come from ResidencyIQ’s own dossier research, with underlying citations on the New York, Illinois, Texas, and Florida residency guides.