In general, for taxable years beginning on or after January 1, 2010, California law conforms to the Internal Revenue Code (IRC) as of January 1, 2009. However, there are continuing differences between California and federal law. When California conforms to federal tax law changes, we do not always adopt all of the changes made at the federal level. For more information, go to ftb.ca.gov and search for conformity. Additional information can be found in FTB Pub. 1001, Supplemental Guidelines to California Adjustments, the instructions for California Schedule CA (540 or 540NR), and the Business Entity tax booklets.
The instructions provided with California tax forms are a summary of California tax law and are only intended to aid taxpayers in preparing their state income tax returns. We include information that is most useful to the greatest number of taxpayers in the limited space available. It is not possible to include all requirements of the California Revenue and Taxation Code (R&TC) in the tax booklets. Taxpayers should not consider the tax booklets as authoritative law.
Conformity – For updates regarding federal acts, go to ftb.ca.gov and search for conformity.
