No. You only have to pay California tax for the period of time you were physically working in California.
Here is an example provided by the Franchise Tax Board:
You relocate to another state and continue to work remotely for a California employer. You periodically travel to and from California in order to perform services for your employer. You receive a W-2 from them. Do you need to file a California return and pay California income tax?
Answer: Yes.
If you are a part-year resident, you pay tax on:
- All worldwide income received while you are a California resident
- Income from California sources while you were a nonresident
During the nonresident portion of the year (or if you are a full-year nonresident), you will have California source income to the extent you physically performed services in California. You will need to file a California Nonresident or Part-Year Resident Income Tax Return (Form 540NR), to report the California-sourced portion of your compensation.
One way to calculate the portion of your income that is California sourced is to multiply your total amount of income for the year by a ratio of your total number of days performing services in California over your total number of days performing services worldwide.
CA Workdays / Total Workdays = % Ratio
% Ratio x Total Income = CA Sourced Income
See Scenario 1 in Part-year resident and nonresident
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