According to the State of California Franchise Tax Board, over six million California residents are eligible to e-file their 2007 state income tax returns for free.
There are some exceptions, but generally speaking, anyone who lived in California the entire year, is filing an original return (i.e. not amended), and whose only other reportable tax is Use Tax, may qualify to use CalFile. The state has set qualification criteria, which is listed on the Franchise Tax Board website. In general, those eligible for CalFile must claim five or fewer dependents and have federal adjusted gross income (AGI) below $155,416 per individual filer. (This limit is $233,129 for head of household and $310,837 for married/registered domestic partnership, filing jointly and qualifying widowers). Additionally, there is qualification criteria related to sources of income, federal AGI adjustments, state adjustments to income, itemized deductions, tax payments, exemptions, and credits.
California taxpayers may use CalFile whether they do not owe taxes, owe a payment, or are due a refund.
The FTB website lists several exceptions that prohibit an individual from using the free filing program. Among taxpayers who may not qualify are those with unique situations such as Roth IRA conversions, individuals claiming a disaster loss or military-related extension, and those who need to make certain state adjustments to federal itemized deductions. Also, taxpayers must use original, not substituted or corrected W-2s. A complete list of exceptions is available on the Franchise Tax Board’s website.
Taxpayers with adjusted gross incomes under certain thresholds may qualify for free federal tax return e-filing as well.
Furthermore, anyone who doesn’t qualify for free state tax return filing through CalFile may have luck finding free state return filing through an IRS Free File provider.
Source: State of California Franchise Tax Board Website