California has some of the most complex sales tax laws in the US. It’s one of the few states with a hybrid sourcing system for sales tax. County and state sales taxes use origin-based sourcing, but district sales taxes use destination-based sourcing. These complexities can make it challenging to file a timely, accurate sales tax return.

Below, we’ll explain how to file a sales tax return in California, including how to identify your filing frequency and due dates, how to prepare your return, and how to amend it.

Key takeaways

• Accurately completing a California sales tax return requires separating taxable and nontaxable sales, mapping transactions to specific local tax districts, and completing additional state schedules for multilocation or out-of-state sales.

• While returns are typically filed quarterly, high-volume sellers must make monthly tax prepayments. All businesses face strict financial penalties for filing or paying late, even if they owe a zero-dollar return.

• There’s a strict statute of limitations on when you can amend a return to claim an overpayment.

How to find your California return due date

The due date for filing your return depends on your average monthly sales tax liability. While most businesses file California sales tax returns quarterly, those with a monthly sales tax liability of $100 or less, on average, can file annually.

Once you register for a California sales tax permit, the state will assign you a filing frequency based on your sales volume. You can find the latest filing due dates on the website of the California Department of Tax and Fee Administration (CDTFA).

Quarterly reporting basis

Monthly reporting basis

Yearly reporting basis: Sales tax accounts

Yearly reporting basis: Qualified purchasers and consumer use tax accounts

Any business with a valid California sales tax permit must file a sales tax return by every due date, even if it has no sales tax to report. In that scenario, the business will complete a sales tax return but not submit any payment.

California sales tax prepayments

Some businesses file quarterly California sales tax returns but are required to make monthly prepayments. According to Section 6471 of the California Sales and Use Tax Law, any business with a monthly sales tax liability of $17,000 or more, on average, has to make prepayments.

In this scenario, instead of paying your sales tax liability at the time you file your return, you’ll make a payment each month during the quarter before you file the quarterly return. Prepayments are due on or before the 24th day of the following month. In other words, your January prepayment would be due by February 24, your February prepayment would be due by March 24, and you’d make your March prepayment when you file your first quarter sales tax return at the end of April. Each monthly prepayment has to be at least 90% of the tax liability due for that month.

Quarterly prepayment reporting basis

The rules for second-quarter prepayments are different. The initial prepayment, for the month of April, requires the usual minimum of 90%. But the second prepayment, for the month of May, is considered to be a prepayment for May 1–June 15. As a result, it must meet one of the following minimum requirements:

• At least 90% of the tax liability for May plus 90% of the tax liability for the first half of June

• At least 90% of the tax liability for May plus 50% of the 90% tax liability for June

How to prepare your California sales tax return

Before you can start working on the sales tax return, you’ll need to collect the sales information for your tax period. The online tax return system of the CDTFA can tell you what details you need, but filing a return generally requires the following information:

• California seller’s permit or account number: Your official identification number issued by the CDTFA.

• CDTFA Online Services login: Your username and password to access the online portal.

• Total gross sales: Your total sales revenue from buyers located in California during the filing period, regardless of whether those sales were taxable.

• Taxable and nontaxable sales breakdown: You’ll have to break your sales down into taxable and exempt categories. This means identifying your taxable sales by type, your nontaxable sales (e.g., sales to buyers with resale certificates, nontaxable labor, nontaxable foods), and relevant deductions (e.g., shipping charges).

• Local district tax information: California has multiple district tax rates that vary by city and county. You’ll need to report sales by location if you make taxable sales in those districts. For example, buyers in Los Angeles are subject to a 2.25% district tax in addition to the 7.25% California state tax. That means you would charge a total of 9.50% in sales taxes there.

• Business location data (Schedule C): All businesses that operate in California must fill out Schedule C with the addresses of all places of business for which seller’s permits have been issued, along with the taxable amount sold at each location.

• Out-of-state sales by county (Schedule B): Out-of-state businesses will need a list of all sales broken down by county to complete Schedule B.

• Prepayment records: If you’re going to make monthly prepayments, you’ll want to have those totals ready so you can accurately calculate the remaining balance due for the quarter.

• Payment method: Your bank account and routing number if you plan to remit your taxes online.

• Filing frequency: Your CDTFA-assigned filing schedule (e.g., monthly, quarterly, annual).

If the amount of taxable sales doesn’t exceed economic nexus thresholds in California, a sales tax return might not be required. However, if a business has employees, an office, or a warehouse in California and is selling taxable goods, services, or both, it must collect sales taxes on all taxable transactions, file returns, and pay the appropriate amount to the state. If no sales were made during a filing period, that business must still file a return for $0.

How to complete and file a California sales tax return

The final step to completing a sales tax return in California is to file and remit the tax. The CDTFA has an online filing system that’ll help you enter your information to generate the return. Here’s how you can complete the process:

• Log in: Access the CDTFA Online Services portal using your credentials.

• Select your period: Choose your specific sales tax account and the filing period for your return.

• Input your data: Enter your gross sales, nontaxable sales, and any applicable deductions.

• Allocate district taxes: If you made sales in special tax jurisdictions, allocate those sales to the correct local districts so the system can calculate the additional rates.

• Apply prepayments: Review the system’s final tax calculation and subtract any monthly prepayments you’ve already made for that quarter.

• Submit and pay: Submit your final return and remit the remaining balance due through the CDTFA portal.

Once you complete the return, you’ll then need to remit the total sales tax minus any monthly prepayments you’ve already made. You can pay electronically through the CDTFA’s website.

It’s important to complete this process by your assigned deadline. Businesses are subject to a standard penalty of 10% of the tax amount due if a return is filed late or the tax is paid late. In addition to this penalty, statutory interest will accrue monthly on the unpaid tax balance from the original due date until the liability is paid in full.

How to file an amended California sales tax return

To correct a previously submitted filing, you must file an amended return directly through the CDTFA Online Services portal.

Once you log in, you’ll navigate to the specific filing period that requires a correction and select the option to amend the return. It’s important to enter your corrected financial figures for the entire period rather than just input the difference between the original and revised amounts. The timeline for filing an amendment depends on the result of your correction:

• If you owe additional tax: You’ll want to file the amended return and remit the outstanding balance as soon as possible to minimize the continued accumulation of statutory interest and penalties.

• If you overpaid: Your amended return will serve as your formal claim for a refund. To receive your money back, you’ll need to file this amended return within the state’s statute of limitations, which is generally three years from the original due date of the return.

How to file a final California sales tax return

If you’re going to close your business, sell it, or transfer ownership, the CDTFA will require you to officially close out your seller’s permit and file a final sales tax return.

This final return must report all transactions up to your closeout date, which include sales of any business fixtures, equipment, or remaining inventory. If you’re planning to acquire an existing business, you must request a tax clearance certificate from the CDTFA. Without it, purchasers can be held legally responsible for the previous owner’s unpaid sales taxes, fees, and penalties.

Normally, businesses can file their final returns on their assigned monthly or quarterly schedules. However, businesses that file annually must file their final returns by the standard quarterly deadline of the quarter in which they closed.

If any due date falls on a weekend or state holiday, it moves to the next business day.

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