Getting a notice that your tax return is under audit can make anyone uneasy. You might even realize you made a mistake and wonder if you can fix it before the audit moves forward. In California, amending your return after receiving an audit notice is possible, but it must be done carefully.
Understanding what an audit notice means
When the California Franchise Tax Board (FTB) sends an audit notice, it means they plan to review specific details of your return. The notice outlines what they’re checking and requests certain records. At this stage, the FTB has already flagged your return for review. Trying to change it mid-process can complicate the situation if it’s not handled correctly.
When an amended return may help
You can file an amended tax return even after an audit notice if you spot an error that affects your reported income, deductions, or credits. Correcting those issues early can show good faith and may help reduce penalties. However, timing is important. If you file the amended return too late or fail to explain your corrections clearly, it might not influence the audit outcome.
How to submit an amended return during an audit
If you decide to amend your California return during an audit, you must use Form 540X for individuals or Form 100X for corporations. Include a detailed explanation of each change and supporting documents that verify your corrections. The FTB may review the amended return along with the ongoing audit, or they may adjust the audit’s scope based on your submission.
What to expect after amending your return
Amending a return doesn’t automatically stop or cancel the audit. The auditor will still verify your original and corrected figures. If your amendment fixes a legitimate mistake and reduces your tax liability, it may help you avoid additional interest or penalties. If it adds income or reduces deductions, it could increase the balance you owe but help prevent further disputes later.