Break apart the of days in California vs. outside of California.
California says, "As a nonresident who relocates to California for any portion of the year, you will have California source income during the period of time you performed services in California. You will need to file a California Nonresident or Part-Year Resident Income Tax Return (Form 540NR) return 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."
See: Income sourcing for nonresidents temporarily relocated to California, and filing and paying Californ...
