Under the circumstances you described, you would file a California state return and pay California income tax on all of your California-sourced income, based on your W-2 and other tax information forms, but not your Washington income; you won't need to make a calculation.
After making all of the entries needed to complete your Federal return, add a California state return in TurboTax and complete the California interview. TurboTax will include only the California income on your California return.
As a nonresident of California, all of your California-sourced income is taxable. If you lived in a state that has a state income tax, you would normally be taxed on all of your income by your resident state and you would receive a credit on your resident return for taxes paid to California. Since you live in a state (WA) that doesn't have an income tax, you would just file a California return and report California income.
See this California Franchise Tax Board webpage for more information.
A nonresident is a person who is not a resident of California.
Generally, nonresidents are:
- Simply passing through
- Here for a brief rest or vacation
- Here for a short period of time to complete:
- A job
- A transaction
- Contract work
As a nonresident, you pay tax on your taxable income from California sources.
Sourced income includes, but is not limited to:
- Services performed in California
- Rent from real property located in California
- The sale or transfer of real California property
- Income from a California business, trade or profession
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