If you were self-employed and doing that work in California, then you would enter your net income from the self-employment work during the time that you worked in California.
For the self-employment tax, you would multiply the number on your federal return by a percentage. The percentage would be your net income from self employment while working in California (the number you entered above) divided by your total net income for the year from self-employment.
For the student loan interest, your can divide the number of days you worked in California during the year by 365, and multiply the result by your student loan interest for the year.
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