How does California source a nonresident's compensation and fringe benefits?

The statutory frame

The threshold question is residency, because it decides which sourcing rules matter at all. A California resident is taxed on all income from all sources, with relief for taxes paid to other states arriving through the other state tax credit rather than through sourcing. A nonresident is taxed only on taxable income derived from sources within California (Revenue and Taxation Code Section 17951), and gross income from sources within and without the state is allocated and apportioned under the Franchise Tax Board's regulations (Revenue and Taxation Code Section 17954). Income from California sources includes income from a trade, business, or profession carried on within the state, and for an employee that means compensation for personal services performed here. The sourcing rules for that compensation live in California Code of Regulations, title 18, Section 17951-5.

The three rules of Section 17951-5

The regulation works through three situations in sequence. First, if a nonresident is employed continuously in California, the entire compensation for the period of California employment is California-source income; there is nothing to apportion. Second, if the nonresident is employed in California at intervals throughout the year, gross income from California sources includes that portion of the total compensation for personal services which the total number of working days employed within the state bears to the total number of working days both within and without the state, for an employee paid on a daily, weekly, or monthly basis; an employee paid by the mile apportions by California miles. This is the working-days ratio, and it is the workhorse rule for the traveling executive, the multistate employee, and the inbound assignee. Third, if the employee is paid on some other basis, the total compensation must be apportioned between California and other states and foreign countries in such a manner as to allocate to California that portion of the total compensation which is reasonably attributable to personal services performed in this state. The regulation also carries special rules for commission-based salespeople (sourced by volume of business transacted in California), performers (sourced by performances in California), and professionals (sourced by fees for services performed in California), and those rules displace the general ratio where they apply.

Fringe benefits and the federal divergence

Federal regulations (Treas. Reg. section 1.861-4(b)(2)(ii)(D)) source six fringe benefits geographically rather than by working days: housing, education, local transportation, tax reimbursements, hazardous or hardship duty pay, and moving expense reimbursements. The natural question is whether California follows. It does not, because there is nothing to follow into. The California regulation does not address fringe benefits as a category at all, so a fringe benefit is compensation for personal services and runs through the same three rules as wages. Where a benefit can be attributed to California services, such as a reimbursed move into the state, it is sourced to California directly, and a reimbursed move out of the state is not California-source (Appeal of Harmount, 77-SBE-121; Franchise Tax Board Residency and Sourcing Technical Manual, section 3235). Where it cannot, it falls into the some-other-basis rule, and the reasonably-attributable standard is satisfied by the same working-days ratio that governs the rest of the compensation. The practical consequence for a return preparer is that the federal geographic sourcing of, say, a housing allowance for an overseas posting does not carry into the California column: the allowance is apportioned on California working days like the salary it accompanies. It is also worth remembering that California and federal law do not always agree on which fringe benefits are gross income in the first place, so the California computation can differ in the inclusion step before sourcing is ever reached.

Trailing compensation and the year of the services

Compensation frequently arrives in a year other than the one in which the services were performed: an employer's payment of the employee's prior-year taxes under an equalization program, a bonus for last year's work, a benefit that reimburses a cost incurred on an earlier assignment. The sourcing follows the services, not the payment date. A payment that compensates for services performed in an earlier year is apportioned on the working-days ratio of that earlier year, and each year's trailing items carry their own ratio. A payment tied to the current year's services uses the current year's days. Keeping a working-days calendar for every year an employee touches California is therefore not bookkeeping excess; it is the input every later year's return will need. The premise of the whole exercise, though, is that the trailing payment compensates for services at all, and that premise is contestable in the separation context taken up next.

When the payment buys a release rather than services

The working-days ratio assumes the payment is compensation for personal services performed somewhere. Where that assumption fails, a different statute can control the answer. Revenue and Taxation Code Section 17952 sources income from intangible personal property to the owner's state of residence unless the property has acquired a business situs in California, and a contractual claim or right can be intangible personal property for that purpose. A payment made in exchange for the surrender of such a claim is therefore not California-source merely because the employment relationship that produced the claim was a California relationship.

The Office of Tax Appeals reached that result in Appeal of Otting, 2026-OTA-403P, posted in August 2026 and marked pending precedential. The opinion applies the Board of Equalization's precedential decision in Appeal of McAneeley (80-SBE-131), which treated termination payments for the release of contract rights as income from intangible personal property sourced to the recipient's domicile. A nonresident former chief executive received severance payments and payments for medical premiums after a California employment ended. The Office of Tax Appeals held that those amounts were paid in recognition of the release of claims or rights that had not acquired a business situs in California, and that they were accordingly not California-source income, notwithstanding that the underlying services had been performed in the state. Restricted stock units that vested were treated differently: because they were compensation wholly attributable to the officer's California employment, the Office of Tax Appeals held that they had acquired a California business situs under the Section 17952 regulation, and they remained California-source income. Both outcomes were decided under Section 17952; the line the opinion draws is between consideration for a release of claims that never acquired a California business situs and equity wholly attributable to California services, which did.

The opinion's status deserves attention, though less than it first appears. A pending precedential designation is not a final one, and a filed position should describe Otting as what it is; but the rule it applies has been precedential since McAneeley in 1980, and Otting applies that rule to a modern executive package. The working-days ratio remains the default frame for compensation for services, and Section 17952 is the exception that has to be earned on the documents rather than asserted on the label. What Otting rewards is characterization evidence: a separation agreement that allocates consideration to a release of claims, supported by the negotiation record and by the absence of any California business situs for the claim, presents a materially different sourcing question from an agreement that calls the whole payment severance and computes it off the departing salary.

Practice notes

The working-days ratio rewards contemporaneous records and punishes reconstruction. A day count assembled from travel records and calendars after the fact invites examination adjustments, and the Franchise Tax Board's residency and sourcing audits routinely test the count against badge data, flight records, and expense reports. Days worked, not days present, drive the ratio, so weekends, holidays, and vacation days spent in California do not source compensation here by themselves, and the count should be built on working days from the start. For equity compensation and bonuses that vest or accrue over a multi-year period, the apportionment window is the period the compensation was earned, grant to exercise or earlier termination for a nonstatutory option and grant to vest for restricted stock units under the Franchise Tax Board's published guidance, which may span several ratios, and that computation deserves its own workpaper. Before the ratio is computed at all, the characterization question deserves its own look: a separation or settlement payment whose documents allocate consideration to a release of claims raises the Section 17952 track described above, and that allocation is far easier to establish in the agreement while it is being negotiated than to reconstruct on audit years later. And because the residency determination controls everything upstream of sourcing, a part-year or contested residency file should settle residency first: sourcing precision is wasted effort if the taxpayer turns out to be a resident taxed on everything. G&G State Tax Group provides nonresident compensation sourcing analysis and residency representation alongside its state and local tax practice.