Taxability of Stipends
Section 117 of the Internal Revenue Code applies to the tax treatment of scholarships and fellowships. Degree candidates may exclude from gross income (for tax purposes) any amount used for course tuition and related expenses such as fees, books, supplies, and equipment required for courses of instruction at a qualified educational organization. Nondegree candidates are required to report as gross income any monies paid on their behalf for stipends or any course tuition and fees required for attendance.
More information can be found in the Office of Postdoctoral Scholar Affairs document. Search under the heading POSTDOCTORAL FELLOW TAX INFORMATION
Where to Obtain Forms, Instructions And Publications
Federal (IRS): http://www.irs.gov
Federal Tax Withholding Calculator at irs.gov (enter “calculator” in Search IRS Site)
CA State: http://www.ftb.ca.gov
Some IRS Publications that may assist you in filing your return are:
Publication 17 Your Federal Income Tax
Publication 505 Tax Withholding & Estimated Tax
Publication 970 Tax Benefits for Education.
This is not a comprehensive list. Please consult your tax advisor for more information.

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