Moving from Indiana to California: Residency, Taxes, and What to Prove

In Indiana

Indiana applies its ordinary domicile and 183-day/permanent-residence tests to a travel nurse the same as anyone else: a nurse not domiciled in Indiana who keeps a permanent Indiana residence and is present more than 183 days becomes an Indiana resident on worldwide income for that year, plus the applicable county tax. The more frequent exposure runs the other way, where a nurse claims a Florida or Texas tax home while actually renting in Indiana for most of an assignment; Indiana taxes nonresident wages for days actually worked in the state regardless of the claimed tax home.

In California

California is both a major origin state, since many nurses domiciled here take travel contracts elsewhere, and the single highest-paying destination state for travel assignments. A nurse's tax home must be a genuine, regularly-returned-to residence with duplicated living expenses; nurses who claim a tax home in Texas or Florida but never actually go back risk having the FTB or IRS reclassify housing stipends as taxable wages if the facts show California, not the claimed state, is really home. A nurse domiciled outside California who works a temporary California assignment as a W-2 traveler does not become a California resident from that assignment alone, but the wages earned during the California contract are still California-source and must be reported on a nonresident Form 540NR.

In Indiana

Indiana taxes nonresident professional athletes using the standard duty-day formula applied across nearly all income-tax states: total season compensation multiplied by the ratio of Indiana duty days (games, practices, and mandatory team functions in the state) to total duty days for the season. This applies to visiting NFL and NBA teams playing the Colts and Pacers in Indianapolis, and Indiana's flat, comparatively low rate means the dollar amount at stake per game is smaller than in higher-rate states, though the filing obligation is the same.

In California

California is the most aggressive jock-tax state. FTB counts not just game days but practices, walkthroughs, and even voluntary workouts held at a California team facility during game week, which can turn one road game into three or four California duty days. With the Lakers, Clippers, Warriors, Kings, 49ers, Rams, Chargers, Dodgers, Giants, Padres, and Athletics all based here, nonresident athletes playing any California team face California nonresident tax on their duty-day-apportioned income, while California-domiciled athletes owe California tax on their full worldwide income.

In Indiana

The Indiana snowbird risk runs through the same domicile-abandonment presumption that protects year-round Indiana residents: a retiree who keeps a permanent Indiana residence, continues to vote in Indiana, or keeps the homestead deduction active while wintering in Florida is presumed not to have abandoned Indiana domicile. Separately, spending more than 183 days in Indiana in a year while maintaining a permanent Indiana residence independently triggers Indiana residency regardless of domicile intent.

In California

The nine-month presumption under §17016 only creates a rebuttable presumption of residency past that point; it does not create a safe harbor below it. Spending fewer than nine months in California does not guarantee nonresidency; FTB still applies the closest-connections test. This is the classic dual-home audit target described across Bogleheads and r/tax threads: a retiree who keeps the California house, splits time with a Nevada or Arizona property, but leaves a spouse, kids, doctors, or the majority of actual annual days in California.

In Indiana

Indiana has no convenience-of-the-employer rule. A nonresident who works remotely from another state for an Indiana-based employer is generally not taxed by Indiana on those wages, since Indiana sources employee compensation to where the work is physically performed rather than to the employer's location.

In California

California has no convenience-of-employer rule like New York's. A nonresident who physically performs all their work outside California for a California-headquartered employer is not California-taxed on those wages solely because the employer is based here. The trigger is the employee's own residency and physical work location, not the employer's address. A California resident, however, owes California tax on remote wages regardless of where the employer sits.

In Indiana

Indiana follows the federal Servicemembers Civil Relief Act and Military Spouses Residency Relief Act. A servicemember whose domicile was Indiana before entering service remains an Indiana domiciliary regardless of duty station unless they affirmatively establish a new domicile, while a servicemember stationed in Indiana on orders, and a qualifying spouse, does not become an Indiana resident solely because of the posting; Indiana also allows a deduction for certain military retirement income.

In California

California follows the federal Servicemembers Civil Relief Act and the Military Spouses Residency Relief Act. Active-duty military domiciled outside California but stationed here under orders are not California residents and their military pay isn't California-taxed. Under MSRRA and the Veterans Benefits and Transition Act, a nonmilitary spouse can elect the servicemember's domicile for state tax purposes instead of being pulled into California residency by physical presence alone.

In Indiana

Federal law (49 U.S.C. §40116) limits states to taxing airline employee compensation only in the employee's state of residence and any state where more than 50% of pay is earned, protecting flight crew based at Indianapolis International who are domiciled outside Indiana from full-income Indiana taxation based solely on their duty station.

In California

Federal law (49 U.S.C. §40116) limits taxation of air carrier employees to their state of residence and any state where they earn more than 50% of their pay, overriding ordinary duty-day sourcing. California hosts major crew bases at LAX and SFO, so this carve-out matters heavily for California-based flight crew who fly national or international routes.