How to File Sales Tax in California: Frequency, Returns, and Penalties

To file sales tax in California, log in to the California Department of Tax and Fee Administration (CDTFA) online services portal, complete the sales and use tax return for your assigned reporting period, and submit payment by the last day of the month after that period ends.1California Legislative Information. California Code Revenue and Taxation Code 6451 – Returns and Payments Every holder of a seller’s permit has to file for every assigned period, even one with no sales.2California Department of Tax and Fee Administration. Frequently Asked Questions – Sellers Permit A zero return still counts as a filed return.

What to Pull Together First

Open your books before you open the portal. The return asks for specific figures, and having them ready prevents the back-and-forth that leads to amended filings.

  • Total gross sales for the period, including taxable and nontaxable transactions, lease receipts, and rental income, reported before any deductions.3California Department of Tax and Fee Administration. Online Filing Instructions – Sales and Use Tax Return
  • Nontaxable sales broken out by category: sales for resale backed by a valid resale certificate, exempt food products sold for human consumption, separately stated nontaxable labor charges, and sales to the U.S. government.4California Department of Tax and Fee Administration. Common Sales and Use Tax Nontaxable Sales and Partial Exemptions
  • Purchases subject to use tax: items you bought from out-of-state vendors who did not collect California tax, or inventory you took under a resale certificate and then used in your business.5California Department of Tax and Fee Administration. California Businesses – How to Identify and Report California Use Tax Due
  • Taxable sales broken down by the district where each sale took place, since you allocate district tax on a separate schedule.

Your invoices, ledgers, and point-of-sale reports back these numbers up. If a figure comes under question later, those records are what you’ll be asked for.

Portal Access

The CDTFA stopped issuing limited access codes to new registrants in June 2022 and has been phasing them out for existing filers.6California Department of Tax and Fee Administration. Limited Access Code Removal If you have been filing with a limited access code, set up a username and password through the online services portal before your code is retired. New registrants create credentials during signup.

Your Filing Frequency and Due Date

The CDTFA assigns your filing frequency when you register, based on reported tax liability or anticipated taxable sales. The options are monthly, quarterly, quarterly with prepayments, fiscal yearly, or yearly.7California Department of Tax and Fee Administration. Doing Business in California – What You Need to Know Most small businesses start quarterly.

Whatever your schedule, the return and payment are due on or before the last day of the month following the end of the reporting period.1California Legislative Information. California Code Revenue and Taxation Code 6451 – Returns and Payments A quarter ending March 31 is due April 30. When that date falls on a weekend or state holiday, the deadline moves to the next business day.8California Department of Tax and Fee Administration. Filing Dates for Sales and Use Tax Returns

Prepayments for Larger Filers

If your average monthly tax liability is $17,000 or more, you’re required to make prepayments during the quarter instead of paying the full amount at the end.9California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6471 The CDTFA notifies you in writing when you’re placed on a prepayment schedule. Each prepayment is credited against the total tax due on your quarterly return.10California Department of Tax and Fee Administration. Return Prepayments You can confirm your assigned frequency and any prepayment obligation by logging into your CDTFA account.

Working Through the Return

The online return moves in a set order. Knowing what each section wants keeps you from having to hunt back through screens.

Gross Sales, Then Deductions

The first field is total gross sales for the period, covering all taxable and nontaxable activity along with any lease and rental receipts.3California Department of Tax and Fee Administration. Online Filing Instructions – Sales and Use Tax Return Quarterly filers report all three months here, even if prepayments were already made.

The deductions page then lets you subtract nontaxable amounts in specific categories: sales for resale, exempt food products sold for human consumption that aren’t served heated or as a meal eaten on-premises, nontaxable installation or repair labor itemized separately on invoices, and qualifying interstate or foreign commerce sales shipped from California to out-of-state destinations.11California Department of Tax and Fee Administration. CDTFA-401-EZ – Short Form Sales and Use Tax Return What’s left after deductions is your net taxable amount, which the statewide 7.25% rate applies to.12California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rate Information

District Tax Allocation

Nearly every California location layers district taxes of 0.10% to 2.00% on top of the statewide rate, and you allocate your taxable sales to the correct districts on Schedule A.13California Department of Tax and Fee Administration. District Taxes and Sales Delivered in California Select each district on the online form and enter the taxable amount for that location; the system applies the correct rate. The sum of your district-allocated sales has to match the taxable total from the main return. A mismatch is one of the most common reasons the CDTFA follows up on a filing.

Use Tax on Business Purchases

A field near the end captures use tax on items your business bought without paying California tax. Equipment ordered from an out-of-state vendor that did not collect California use tax is the standard example. You also report inventory originally bought for resale under a resale certificate that you ended up keeping, consuming, or giving away.3California Department of Tax and Fee Administration. Online Filing Instructions – Sales and Use Tax Return Enter the purchase price and the system calculates the tax.

Paying

After the summary page shows your total due, you submit the return and choose how to pay.14California Department of Tax and Fee Administration. Online Services – Make a Payment ACH debit from a bank account is the most common option; enter your routing and account numbers and schedule the withdrawal. Credit card payments go through the portal but may carry a processor convenience fee. If you prefer to mail a check or money order, print the payment voucher after filing and send it in.

Save the confirmation page and download the filed return and payment receipt. Those are your proof of a timely filing if a question comes up later.

What Late or Missing Returns Cost

Deadlines are not a soft target. The CDTFA charges a 10% penalty for a late-filed return and a separate 10% penalty for a late payment.15California Department of Tax and Fee Administration. Interest, Penalties, and Collection Cost Recovery Fee File and pay late, and both apply, pushing you to 20% on top of the tax itself.

Interest accrues as soon as a payment is overdue. For 2026, the CDTFA rate on unpaid tax is 10% per year, applied for each month or partial month the balance is outstanding, and the rate is recalculated every six months based on the federal rate plus three percentage points.16California Department of Tax and Fee Administration. Interest Rates

Beyond money, Revenue and Taxation Code Section 6070 lets the CDTFA revoke your seller’s permit when returns go unfiled or tax goes unpaid. You get written notice and a chance to cure before a hearing, and revocation takes effect 60 days later if you don’t respond. Operating without a valid permit is a misdemeanor, and the CDTFA can refuse to issue you a new one while any liability remains.

Skipping a return altogether is the worst option. The CDTFA can estimate what you owe and issue a deficiency determination, and the usual three-year statute of limitations for assessments stretches to eight years when no return was filed.17California Department of Tax and Fee Administration. Sales and Use Tax Law – Section 6487 Filing on time, even a zero return, keeps that longer window closed.

Keeping Records After You File

California requires you to retain sales and use tax records for at least four years, including receipts, invoices, resale certificates, ledgers, and anything else supporting the figures on your returns.18California Department of Tax and Fee Administration. Regulation 1698 The CDTFA can authorize earlier destruction in writing, but without that approval, four years is the floor. Electronic records are fine as long as they clearly show income and expenses and remain accessible if the CDTFA asks for them in an audit. There’s no required format; your point-of-sale system, accounting software, or spreadsheets all qualify.