The retention period depends on which California agency you’re thinking about, because each one has a different audit window.

The Franchise Tax Board (FTB) can audit your state income tax returns up to 4 years from the filing date. If you underreported your gross income by 25% or more, that window extends to 6 years. The IRS follows a similar pattern with a 3-year standard window and 6 years for substantial underreporting. Since both agencies can come looking, the practical rule is to keep income tax supporting records for at least 7 years.

For payroll, the Employment Development Department (EDD) can audit your records going back 3 years. Federal requirements under the Fair Labor Standards Act also require keeping payroll records for at least 3 years and time cards and wage computations for 2 years. Keep all payroll records for at least 4 years to cover both state and federal requirements comfortably.

Sales tax has the longest retention window. The California Department of Tax and Fee Administration (CDTFA) can audit your sales tax records going back 8 years. If you collect sales tax, keep every related document for at least that long. This includes resale certificates from customers who claim tax-exempt purchases. If you can’t produce a valid resale certificate during an audit, you owe the tax plus penalties and interest.

Here’s what you should actually be keeping. Bank and credit card statements for every business account, since these are your primary proof of income and expenses. Receipts and invoices for all purchases and sales. Payroll records including pay stubs, tax deposit confirmations, quarterly filings, W-2s, and 1099s. Federal and state tax returns with all supporting schedules. Contracts, leases, and loan documents for the life of the agreement plus 7 years. Business licenses and permits. And asset purchase records for as long as you own the asset plus 7 years after disposal, because you need these for depreciation calculations.

Digital records are fully acceptable in California. Scanned receipts, electronic bank statements, and digital copies of invoices all work fine. What matters is that records are legible, organized, and accessible if an auditor requests them. A hard drive full of unsorted PDFs is only marginally better than a shoebox of faded receipts.

The practical baseline is to keep everything for at least 7 years, with sales tax records held for 8 years and asset records kept for the life of the asset plus 7 more years. When in doubt, keep it longer. Storage is cheap compared to the penalties for not being able to produce a document.

Having organized books is what makes all of this manageable rather than overwhelming. When your full-service bookkeeping is current and transactions are categorized correctly each month, every record has a place and can be pulled up quickly. That’s the difference between an audit being a minor inconvenience and an audit turning into a crisis.

Whether you run a medical practice, a retail shop, or any other business in the area, the retention requirements are the same. At Sarker Accounting Services in Orange County, we help businesses maintain the kind of organized financial records that hold up under scrutiny from any agency. The goal is to never scramble when someone asks for documentation.