Your income is taxable to both California AND Hawaii unless you abandoned your CA residency and became a HI resident for two months. California defines a resident as any individual who meets any of the following:
• Present in California for other than a temporary or transitory purpose.
• Domiciled in California, but outside California for a temporary or transitory purpose.
CA residents are taxed on income earned everywhere.
File a nonresident HI return and report income earned in HI for two months.
File a resident CA return, report all income and claim a credit for tax paid to HI.
You probably should tell you employer that you were going to work outside the state for two months. However if this was your decision, they may not be willing to change your withholding for a short period of time.
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