A California sales tax exemption removes tax liability from a transaction that would otherwise fall under the state's 7.25% base rate. The exemption is based on what's being sold, who's buying it, or how the sale is structured. Some exemptions apply automatically to specific products such as groceries or prescription medicine. Others depend on the customer – whether that's a reseller, manufacturer, or qualifying non-profit – holding a valid certificate at the time of sale. The distinction matters because California puts the burden of proof on the seller, and without the right certificate on file, the California Department of Tax and Fee Administration (CDTFA) presumes a sale was taxable; the presumption holds until the seller can show otherwise.

Below, we'll cover how these exemptions function in California, who qualifies, and where businesses tend to run into trouble.

Key takeaways

• California's combined sales tax rate can exceed 10% once local and district taxes are added to the state base, and exemptions can remove some or all of that tax depending on the transaction.

• Sellers, not customers, carry the burden of proving a sale was exempt, which means it's important to collect a valid certificate before or at the time of the sale.

• Exemptions fall into distinct categories, including product-based, customer-based, and transaction-based, each with its own documentation and audit requirements.

What is a California sales tax exemption?

A California sales tax exemption removes some or all of the combined sales tax rate, which can exceed 10% in some places, from a transaction based on what's being sold, who's buying it, or how the sale happens.

How does a California sales tax exemption work?

A sales tax exemption happens in one of three ways. Knowing which one applies determines what documentation you need before the sale closes:

• Category-based exemptions: The item is exempt regardless of customer, such as groceries sold for home consumption and prescription medicine.

• Customer-based exemptions: The purchaser's status makes the sale exempt, such as a reseller who holds a valid seller's permit or a qualifying government agency.

• Transaction-based exemptions: The nature of the sale exempts it, such as an occasional sale or a purchase made specifically for resale.

Who qualifies for a California sales tax exemption?

Qualification depends on the customer's role in the transaction. Some categories need a certificate on file before the sale goes through; others apply automatically based on the transaction.

Here are some common categories:

• Resellers: Businesses that hold a valid California seller's permit and purchase goods they intend to resell in the regular course of business rather than use.

• Manufacturers and researchers: Businesses buying qualifying machinery and equipment used primarily in manufacturing, processing, refining, fabricating, or research and development, under the partial exemption in Regulation 1525.4.

• Government entities: The US government and its agencies, when purchases are billed directly to and paid for by the government.

• Nonprofit and religious organisations: Qualifying nonprofit and religious groups that make specific purchases tied to their exempt purpose, such as thrift store sales to benefit the organisation.

• Farmers and agricultural operations: Businesses buying diesel fuel used in farming activities, or certain farm equipment used in agricultural production.

Which products qualify for a California sales tax exemption?

Product-level exemptions apply no matter who's buying, though some require certificates as backup. Groceries make up the largest category by dollar amount, but the line between exempt and taxable food is specific.

Here are the main categories of product-level exemptions:

• Groceries for home consumption: Most food products sold for preparation and eating at home are exempt, while hot prepared food, restaurant meals, and carbonated beverages typically aren't.

• Prescription medicine and medical devices: Under Regulation 1591, prescription drugs are exempt, along with prosthetic devices and certain durable medical equipment when a licensed provider prescribes them.

• Manufacturing equipment: Qualifying machinery gets a partial exemption of 3.9375% under Regulation 1525.4, which covers the state's General Fund portion, while local and district tax still applies. The manufacturing exemption caps at US$200 million in qualifying purchases per business per calendar year, and the equipment must spend at least 50% of its time in an eligible manufacturing, processing, or research and development (R&D) activity to qualify.

• Custom computer programs: Software prepared specifically for one customer is exempt, while prewritten software sold on physical media typically isn't. However, beginning 1 January 2027, California will tax many forms of prewritten software as digital goods.

• Aircraft and vessels: Aircraft sold to common carriers and vessels over 1,000 tons qualify under their own separate statutes.

How do you apply a California sales tax exemption certificate?

The exemption certificate protects the seller against a later assessment. The certificate must exist before or at the moment of sale. The common version, the resale certificate (CDTFA-230), needs specific details to hold up:

• Seller's permit number: The purchaser's valid California seller's permit number, which ties the certificate to a registered business

• Property description: A description of the property being purchased, specific enough to match the invoice it's attached to

• Resale statement: A statement that the property being purchased is meant for resale in the regular course of business

• Signature and date: The purchaser's signature and the date, which confirms the certificate was completed at the time of the transaction

California doesn't require certificates to be renewed on a fixed schedule, but the CDTFA recommends getting a new one if the customer's use of the property has changed or if a long time has passed since the original certificate was issued.

The manufacturing partial exemption requires the customer to complete a separate certificate (CDTFA-230-M) that identifies the qualifying equipment and confirms it meets the 50% use threshold. Blanket certificates cover multiple future purchases from the same customer and are allowed for resale transactions. They reduce paperwork for businesses with repeat business customers.

What are the recordkeeping requirements for a California sales tax exemption?

California requires sellers to keep exemption and resale certificates, along with the sales records, for at least four years from the date of the transaction to match the general statute of limitations for assessments. That window stretches further if a business is audited.

Here are some best practices:

• Invoices and purchase orders: These should reference the specific certificate on file rather than simply noting a sale was exempt.

• Shipping documents: These help confirm the transaction matches what the certificate describes, especially for resale and manufacturing exemptions.

• Usage documentation: Businesses need records for the manufacturing exemption that show the equipment met the 50% qualifying-use threshold over its working life.

Businesses that use Stripe Tax can rely on it to calculate the tax due and apply exemptions based on product tax codes and customer exemption status, but they still need to collect and store the certificates.

How should businesses evaluate their California sales tax exemption strategy?

A successful sales tax exemption strategy in California involves matching the correct certificate to the correct transaction and keeping that paperwork organised well before an audit starts.

Here's how it works:

• Build a certificate checklist: Track which certificate applies to which customer type, how long each one has been on file, and whether the purchase still matches what the certificate describes.

• Revisit usage-dependent exemptions: Confirm equipment is still meeting the 50% qualifying-use threshold for the manufacturing partial exemption; don't assume it holds from the original purchase.

• Automate where the logic allows it: Stripe Tax can apply exemptions across a catalogue of products and customer types once certificates and tax codes are in place.

• Start with the source: Businesses expanding into California from other states can use the CDTFA's registration and exemption guidance as a starting point before applying that logic more broadly across a tax setup.

How Stripe Tax can help

Stripe Tax reduces the complexity of tax compliance so you can focus on growing your business. Start collecting taxes globally by adding a single line of code to your existing integration, clicking a button in the Dashboard, or using our powerful application programming interface (API).

Stripe Tax helps you monitor your obligations and alerts you when you exceed a tax registration threshold based on your Stripe transactions. It can also register to collect tax on your behalf in the US, automate US filings in the Dashboard, and manage global filings through trusted partners. Stripe Tax automatically calculates and collects sales tax, value-added tax (VAT), and goods and services tax (GST) on:

• Digital goods and services in all US states and over 100 countries
  
• Physical goods in all US states and 42 countries
  

Stripe Tax can help you:

• Understand where to register and collect taxes: See where you need to collect taxes based on your Stripe transactions. After you register, switch on tax collection in a new state or country in seconds. You can start collecting taxes by adding one line of code to your existing Stripe integration, or add tax collection with the click of a button in the Stripe Dashboard.

• Register to pay tax: If you need to register for sales tax in the US, let Stripe manage your tax registrations. You'll benefit from a simplified process that prefills application details – saving you time and simplifying compliance with local regulations. If you need help registering outside of the US, Stripe partners with Taxually to help you register with local tax authorities.

• Automatically collect tax: Stripe Tax calculates and collects the right amount of tax owed, no matter what or where you sell. It supports hundreds of products and services and is up-to-date on tax rules and rate changes.

• Simplify filing: Stripe Tax automates US filings in the Dashboard, powered by TaxJar. For global filings, Stripe Tax seamlessly integrates with filing partners, so your global filings are accurate and timely. Let our partners manage your filings so you can focus on growing your business.

Learn more about Stripe Tax or get started today.

FAQs about California sales tax exemptions