California has the highest top marginal state income tax rate in the country at 13.3%, and zero reciprocity agreements with any other state. That means every travel nurse on a California assignment files a nonresident California return on their California wages, no matter where their tax home is — there is no shortcut, and no neighboring-state exception.
Key takeaways
- California taxes nonresidents on California-source wages using the same progressive brackets residents pay — there is no separate, simpler nonresident rate.
- California has no reciprocity agreement with any state. Home-state residents from anywhere get no withholding exemption on California wages.
- You’ll file California Form 540NR as a nonresident, reporting only your California-source income, then claim a credit on your home-state return for tax paid to California (if your home state has an income tax).
- California’s major metros carry some of the highest GSA per diem rates in the country, which can offset a meaningful chunk of the extra state tax if your stipends are benchmarked correctly.
California’s income tax brackets
California uses ten progressive brackets. These are the 2025 tax year brackets for a single filer — they adjust for inflation annually, so confirm the current year’s exact thresholds at ftb.ca.gov before filing:
- 1% on income up to $10,756
- 2% from $10,756 to $25,499
- 4% from $25,499 to $40,245
- 6% from $40,245 to $55,866
- 8% from $55,866 to $70,612
- 9.3% from $70,612 to $360,659 — most travel nurse income on a California assignment lands in this bracket
- 10.3%–13.3% on income above $360,659, rising in steps to 13.3% above $1,000,000
For a nonresident, only the wages actually earned while physically working in California are taxed at these rates — your tax-free stipends aren’t California-source income if your tax home qualification holds, and any income earned on assignments in other states isn’t California income either.
No reciprocity, ever
California has no income tax reciprocity agreement with any other state — not with neighboring Nevada or Oregon, not with Arizona, not with anywhere. Every reciprocity agreement in the country sits inside a Midwest or Mid-Atlantic cluster; see the full list in State Tax Reciprocity Agreements for Travel Nurses. If you see a recruiter or a coworker claim their home state has a reciprocity deal with California, that’s incorrect — there is no such agreement to claim.
How you actually file
As a nonresident, you file California Form 540NR, reporting only your California-source income — the wages earned while physically working in the state. Your home state still taxes your full-year income (assuming it has an income tax), but most states let you claim a credit for the tax you paid to California on the same income, so you aren’t taxed twice on the same dollars. The general multi-state mechanics — including what happens if you also work assignments in a third state the same year — are covered in Multi-State Taxes for Travel Nurses.
If your tax home is in a state with no income tax (Texas, Florida, Nevada, and similar), there’s no credit to claim because your home state never taxed that income in the first place — you simply pay California’s nonresident tax on the California wages and nothing further.
Per diem rates in California’s major assignment cities
California cities carry some of the highest GSA per diem rates in the country, which is real, tax-free money that partly offsets the state’s income tax bite. Current GSA lodging and meals & incidentals (M&IE) per-diem rates for major California assignment cities:
- San Francisco — $279/day lodging, $79/day M&IE
- San Jose — $245/day lodging, $79/day M&IE
- Oakland — $225/day lodging, $79/day M&IE
- Los Angeles — $219/day lodging, $79/day M&IE
- San Diego — $200/day lodging, $74/day M&IE
- Sacramento — $168/day lodging, $74/day M&IE
Compare your specific agency’s offer against these benchmarks with the Per Diem Checker — agencies sometimes quote stipends well under the GSA rate for these cities, which is real negotiating room given how expensive California housing actually is.
The myth: "I don’t live in California, so I don’t owe California tax"
This is false, and it’s one of the most common misconceptions travel nurses carry into a California assignment. California taxes nonresidents on California-source income regardless of where they live — your home state address has no bearing on whether California can tax wages you earned working inside California. The only way to owe zero California tax on a California assignment is if none of your pay is taxable wages (all tax-free stipend) or you didn’t actually work there, neither of which applies to a normal contract.
Is a California assignment worth it after tax?
It depends on the specific offer, not a blanket rule. California’s 9.3% bracket applies to most travel nurse income earned there, which is meaningfully higher than the majority of other states — see how California stacks up against every state’s after-tax pay in Best States for Travel Nurse Pay After Taxes. But California cities also carry some of the highest bill rates and per diem benchmarks in the country, which can offset a real chunk of the extra tax. Run the specific contract’s numbers — taxable rate, stipends, and your actual home state — rather than assuming California is automatically a worse deal.
FAQ
Does California have a reciprocity agreement with any state?
No. California has no income tax reciprocity agreement with any other state, including its neighbors. Every travel nurse working a California assignment files a nonresident California return.
Do I owe California tax on my tax-free stipends?
No, as long as your tax home qualifies under the same IRS three-factor test that applies federally — California generally follows the federal treatment of accountable per diem and housing stipends for nonresident wage-earners.
Will I be double-taxed working in California?
No. You file a California nonresident return on the California wages, then your home state (if it has an income tax) generally lets you claim a credit for the tax paid to California on that same income, so the same dollars aren’t taxed twice.
Is California per diem actually higher than most states?
Yes, for its major metro areas. San Francisco, San Jose, and Oakland are among the highest GSA per-diem cities in the country, which meaningfully offsets California’s higher income tax if your agency’s stipend actually matches the GSA benchmark.
Before signing a California contract, check your agency’s housing and meals stipends against the real GSA rate for your specific assignment city with the Per Diem Checker.