Per:
Enter the following information and we will computer your California deduction.
Self-Employment income from All Sources While a California Resident, Plus
Self-Employment income from California Sources While a Nonresident of California
_____
Self-Employment Income From ALL sources
_____
Enter the net self-employment income, since the program is trying to split self-employment tax paid between states.
Self-employment income does not include rental income.
But it is not possible to calculate net income for a part of the year since net income includes many annual deductions like health insurance and self-employment tax. The purpose of this calculation is to calculate self-employment tax, so it's not clear when it should be deducted from the gross income. How can you deduct what you are going to calculate by deducting it? That's a mess.