The California tax statute of limitations sets different clocks for different agencies. The Franchise Tax Board has four years from the date you file to assess additional income tax, and 20 years from the date a liability becomes due and payable to collect it. The California Department of Tax and Fee Administration has three years to audit a sales and use tax return. You have your own deadline running the other direction: generally four years to claim a refund. Several situations stretch or eliminate these periods, and a few common events pause them entirely.
How Long the FTB Has to Assess Income Tax
Under Revenue and Taxation Code Section 19057, the Franchise Tax Board has four years from the date a return is filed to mail a Notice of Proposed Assessment. If no notice arrives within that window, the agency cannot propose a new deficiency for that tax year.1California Legislative Information. California Code Revenue and Taxation Code RTC 19057
That window stretches to six years when a taxpayer omits more than 25 percent of gross income from a return. Section 19058 measures the omission against the gross income shown on the return, and for business income “gross income” means total receipts before subtracting cost of goods sold. Income that you adequately disclosed on the return or in an attached statement does not count toward the 25 percent threshold, even if you mischaracterized or miscalculated it.2California Legislative Information. California Code Revenue and Taxation Code RTC 19058
Two situations remove the deadline entirely. If you file a return with the intent to evade tax, the FTB can propose an assessment at any time. And if you never file a return at all, the clock never starts running, because there is no filing date to measure from.1California Legislative Information. California Code Revenue and Taxation Code RTC 19057 Both consequences are open-ended. State investigators can revisit an unfiled or fraudulent year decades later.
How Long the FTB Has to Collect
Once an assessment is finalized and the tax becomes due and payable, a separate 20-year clock begins under Revenue and Taxation Code Section 19255. After that period expires, the debt is abated by law. The FTB must release any liens, withdraw any levies, and stop all collection activity.3California Legislative Information. California Code Revenue and Taxation Code RTC 19255
When more than one liability exists for the same year, the 20-year period runs from whichever due and payable date comes later. That matters if the FTB assesses additional tax after an initial balance was already established for the year.3California Legislative Information. California Code Revenue and Taxation Code RTC 19255
During those 20 years, the FTB can record liens against your property, levy bank accounts, seize assets, and garnish wages by requiring your employer to withhold a portion of your pay.4Franchise Tax Board. FTB 1140 Personal Income Tax Collections Information Any amounts the FTB collects after the deadline are treated as overpayments and must be refunded.
How Long the CDTFA Has to Audit Sales and Use Tax
For businesses that file their returns on time, Revenue and Taxation Code Section 6487 gives the CDTFA three years to issue a deficiency assessment. The three years run from the last day of the calendar month following the reporting period, or from the date the return was filed, whichever is later. Annual filers get the same three-year window measured the same way. To be valid, a Notice of Determination must go out before the deadline expires.5California Department of Tax and Fee Administration. California Revenue and Taxation Code 6487 – Limitations, Deficiency Determinations
Businesses that were required to register but never did, or that failed to file returns, face an eight-year lookback instead. The CDTFA uses that period to reconstruct taxable activity from available records and assess the missing tax with penalties. Fraud or intent to evade sales tax carries no statute of limitations at all.5California Department of Tax and Fee Administration. California Revenue and Taxation Code 6487 – Limitations, Deficiency Determinations
How Long the CDTFA Has to Collect
Once a sales tax determination is final, Section 6711 gives the CDTFA three years to bring a collection action, measured from when the tax became due and payable or from the delinquency. The section also lets the agency continue collecting for as long as any recorded lien remains in force, whichever is longest.6California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6711
The lien provision is the detail that catches most business owners off guard. If the CDTFA records a lien before the initial three-year period runs out, collection can continue for as long as that lien stays active. In practice, this can extend the collection window well beyond three years.
How Long You Have to Claim a Refund
The clock runs the other direction too. Under Revenue and Taxation Code Section 19306, a refund claim must be filed by the latest of these three dates:
- Four years from the date you filed the return, if you filed on time.
- Four years from the original due date of the return, ignoring extensions.
- One year from the date you made the overpayment.
Whichever of the three expires latest is your deadline.7California Legislative Information. California Revenue and Taxation Code 19306 Miss it, and the FTB cannot issue the refund even if you clearly overpaid. Taxpayers who fall behind on filing and assume they can claim old refunds later often lose them for exactly this reason.
A separate rule under Section 19322.1 covers partial payments. Filing a refund claim before you pay the full assessed amount pauses the refund deadline, but the FTB will not process the claim until you pay in full. And no refund can be issued for any payment made more than seven years before the date of full payment.8California Legislative Information. California Revenue and Taxation Code 19322.1
Events That Pause or Extend the Clocks
Several events stop the running of these deadlines. Knowing them matters, because a period you thought had almost run may have been paused for months or years.
Federal Audit Adjustments
When the IRS changes anything on your federal return, you have six months from the date of the final federal determination to report the change to the FTB. This covers adjustments to gross income, deductions, credits, and penalties. For individuals, the reporting requirement applies only if the federal change would increase California tax liability.9California Legislative Information. California Revenue and Taxation Code 18622
The same six-month rule applies when you file an amended federal return. Report the change on time and the FTB generally gets two years from that date to issue an assessment. Fail to report it and the FTB has an extended window to adjust your California return based on the IRS findings, which creates open-ended exposure.
Bankruptcy
Filing for bankruptcy triggers an automatic stay that blocks most FTB collection actions. The 20-year collection clock stops for the duration of the case.10Franchise Tax Board. Statute of Limitations on Collection Actions
Payment Plans and Other Tolling Events
The 20-year collection clock also pauses during an active payment plan, while a service member is deployed to a combat zone, during child support collection activity against the same taxpayer, during a federally declared disaster, when the FTB files a claim in probate, and while related litigation is pending.10Franchise Tax Board. Statute of Limitations on Collection Actions Payment plan tolling is worth flagging. An installment agreement prevents aggressive enforcement, but it also stops the 20-year clock from ticking down, which can matter if a debt is nearing the end of its collection life.
Waivers Extending an Audit
Both the FTB and the CDTFA can ask you to sign a waiver extending the assessment period, usually when an auditor is running out of time. The CDTFA’s authority comes from Revenue and Taxation Code Section 6488, which allows the assessment period to be extended if the taxpayer agrees in writing before the original deadline expires.11California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6488 You are not required to sign. Refusing sometimes prompts the agency to issue an assessment based on incomplete information, which can be higher than what a completed audit would have produced. There is no built-in cap on how many times a deadline can be extended through successive waivers.