Your California bonus pay is taxable to both California (that's where you earned it) and to Michigan (that's where you received it).
California says "Sick leave, vacation pay, and bonuses earned by a nonresident for services performed in California are considered California source income. See the Appeal of Edwin O. and Wanda L. Stevens, 86-SBE-100, May 6, 1986."
See 3440 Sick Leave, Vacation Pay, Bonuses, and Severance Pay in California's Residency and Sourcing Technical Manual
Michigan residents are taxed on all income received while a MI resident.
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