If you’re an out-of-state or foreign seller shipping into California, you owe CDTFA sales/use tax collection once your combined sales into the state cross $500,000 in the current or preceding calendar year — and FBA inventory sitting in a California warehouse triggers the obligation regardless of how much you sell. California is the largest, most complex, and most operationally aggressive state in the US sales tax system. This guide walks you through exactly when you owe, how to register with the California Department of Tax and Fee Administration (CDTFA), how district taxes work, what to do about back-tax exposure, and the realistic cost of getting this wrong.

The short answer: Yes, if any of these are true for you:

1. You exceeded $500,000 in combined sales of tangible personal property delivered into California in the current or preceding calendar year; OR
2. You hold inventory in California (Amazon FBA, third-party warehouse, anything physical); OR
3. You have an employee, contractor, or agent operating in California; OR
4. You attend trade shows or have other in-state physical presence beyond narrow carve-outs.

If none of those apply, you generally don’t owe California sales tax — yet.

• Foreign founders (UK, AU, NZ, EU, SA, Canada) selling into the US via Shopify, BigCommerce, or their own site.
• Amazon FBA sellers based outside California whose inventory has landed in CA fulfillment centers.
• US-based sellers in other states who’ve grown past $500K of California revenue.
• Anyone who got a CDTFA notice and is trying to figure out what just happened.

Three structural realities you need to internalize before reading further:

1. Rate complexity. California has a 7.25% statewide minimum combined rate (6% state + 1.25% mandatory local), plus district taxes layered on top that can push the combined rate to roughly 10.75%–11.25% depending on the buyer’s address. There is no single “California rate.”
2. Operational aggressiveness on inventory. CDTFA treats FBA inventory stored in California fulfillment centers can create physical-presence nexus, though the analysis turns on the specific facts of inventory placement and control. If Amazon has stored your inventory in CA, contact us for a current nexus review.. The marketplace-only registration relief that exists for sellers who only sell through Amazon does not apply to sellers with FBA inventory in California.
3. Use tax vs. sales tax. Out-of-state sellers technically collect use tax (not sales tax) under California’s sales and use tax retailer-engaged-in-business provisions are codified in the Revenue and Taxation Code and interpreted through CDTFA guidance that has evolved with marketplace and remote-seller rules. If you need to confirm how the current statute applies to your facts, contact us for a review.. The customer-facing math is identical, but the legal label affects which permit you receive (more on that below) and how the law is structured.

Don’t want to figure this out yourself? Sales Tax Compliance USA handles your entire US sales tax compliance — registration, filing, district tax sourcing, notices, audit defence — for a single fee. Book a free consultation or learn more about our service.

Bottom line: $500,000. No transaction count. Includes everything.

Under California Revenue and Taxation Code §6203(c)(4), enacted by AB 147 in 2019, a remote retailer is required to register with CDTFA and collect California use tax once total combined sales of tangible personal property delivered into California exceed $500,000 in the preceding or current calendar year.

Three things make California’s threshold unusual:

• It’s $500,000, not $100,000. Most US states use a $100,000 threshold. California’s is five times higher. Some sellers who are over-threshold in 30+ states are still under-threshold in California.
• There is no transaction-count prong. Many states use “$100K or 200 transactions” — California is single-prong, dollar-only. No transaction-count threshold exists under R&TC §6203(c)(4).
• The threshold aggregates across related persons. Sales by you and any “related persons” (within the meaning of IRC §267(b)) are combined for the test. You can’t split sales across affiliated entities to stay under.

This is where most guides go wrong. The statute says “total combined sales of tangible personal property delivered into California.” That phrase pulls in:

• Marketplace-facilitated sales (Amazon, eBay, Etsy, Walmart). Even though Amazon collects and remits the tax for you on those sales, the gross sales amount still counts toward your $500K test.
• Direct-channel sales (your Shopify store, BigCommerce, WooCommerce, direct B2B invoices).
• Both taxable and nontaxable sales. If you sell exempt food products, those still count toward the threshold even though the actual tax due on them is zero.

This is the most-missed trap in the entire California framework. A seller who does $400K through Amazon FBA plus $150K through their own Shopify store has $550K combined — over the threshold — and must register with CDTFA for the Shopify sales (Amazon already covers its own).

• Sales of pure services that don’t involve TPP (since the statute counts TPP only).
• Sales delivered outside California.
• Sales for resale (with valid resale certificate).

AB 147 economic-nexus rules became operative on April 1, 2019, with the $500,000 threshold and Marketplace Facilitator Act provisions effective October 1, 2019.

If you crossed the threshold years ago and never registered, you have retroactive exposure. Skip down to the Voluntary Disclosure Program section — that’s the cleanup tool.

For a side-by-side view of how California compares to every other state, see our economic nexus thresholds by state guide.

Bottom line: marketplaces collect tax on facilitated sales — but that doesn’t mean you have no California obligations.

The California Marketplace Facilitator Act (R&TC §§6042–6047.1) became effective October 1, 2019, requiring registered marketplace facilitators to:

“the marketplace facilitator … is the retailer selling or making the sale of the tangible personal property sold through its marketplace for purposes of paying any sales taxes and collecting any use taxes.”
— R&TC §6043

Translation: when you sell through Amazon, eBay, Etsy, or Walmart, the marketplace itself is treated as the retailer for California tax purposes. They collect the tax from the buyer and remit it to CDTFA. You don’t separately remit on those sales.

Two situations where the marketplace umbrella does not protect you:

1. You also sell through your own website. If you run a Shopify, BigCommerce, or other direct channel, the marketplace doesn’t cover those sales. You must register and collect on the direct channel once your combined sales (marketplace + direct) cross $500K.
2. You have inventory in California. Even if 100% of your sales go through Amazon, holding FBA inventory in a California warehouse means you have physical-presence nexus. Per CDTFA’s Tax Guide for the Marketplace Facilitator Act, a marketplace seller with sufficient physical presence in California — including inventory stored in California — is required to register with CDTFA even if all sales are facilitated by a registered marketplace.

This is the single most common pattern we see at Sales Tax Compliance USA:

• Seller does $300K on Amazon FBA into California → Amazon collects, all good on those.
• Same seller does $250K through their own Shopify → no MF coverage on those.
• Combined: $550K → over the threshold → Shopify sales now require CA registration and collection.

The seller assumes “Amazon handles California for me.” Half-true. Amazon handles Amazon for them. The Shopify channel is a separate, unregistered, non-collecting exposure.

For more on this pattern, see marketplace facilitator laws by state and our Shopify sellers sales tax guide.

Bottom line: economic nexus isn’t the only way you owe. Physical presence — even a warehouse you don’t operate — is independently sufficient.

Amazon operates multiple FBA fulfillment centers in California (the ONT, LGB, SBD, SNA, OAK, and other facility codes). When Amazon distributes your inventory across the network — and Amazon decides where, not you — your goods very often land in California.

R&TC §6203(c)(1) defines a retailer “engaged in business in this state” to include any retailer maintaining, occupying, or using, permanently or temporarily, directly or indirectly, a warehouse or storage place in California. Inventory in an Amazon warehouse is inventory you maintain in California, even though Amazon physically operates the building.

CDTFA’s Marketplace Facilitator Act Tax Guide is explicit:

“A sufficient physical presence … includes … Maintaining inventory … in California.”

The practical consequence: even a $5,000-per-year FBA seller with one pallet in an Inland Empire warehouse has CA registration obligations. Economic nexus is irrelevant — physical presence is independently sufficient.

For a deeper dive, see Amazon FBA sales tax nexus.

A single employee, contractor, sales rep, or agent operating in California on your behalf creates physical-presence nexus under California’s Revenue and Taxation Code addresses several categories of retailers engaged in business in the state, and the applicable subsection depends on your specific activities. If you’re evaluating CA nexus exposure, contact us for a current review.. Hiring a customer-success contractor in San Francisco for $40/hour to handle a couple of accounts is enough.

California offers a narrow trade-show carve-out: sole physical presence at conventions or trade shows is not nexus if (a) total presence is 15 days or less in any 12-month period, AND (b) net income from those activities did not exceed $100,000 in the prior calendar year. Sales made at the trade show itself are still subject to collection. Selling product from a booth at a Long Beach trade show — even within the 15-day window — means you collect tax on those booth sales.

California’s pre-Wayfair click-through and affiliate nexus rules (formerly part of R&TC §6203) are now largely superseded by the post-Wayfair economic nexus framework. If you exceed $500K, you owe regardless of affiliate structure. If you don’t exceed $500K and have no physical presence, the legacy click-through rules are unlikely to ensnare you — but if you have an affiliate relationship that’s edging into solicitation, contact us for a current review.

Bottom line: California is not one rate. It’s a base 7.25% plus 100+ overlapping district tax rates. Remote sellers crossing $500K must collect ALL of them, applied at the buyer’s address.

District taxes are voter-approved local add-ons that fund city, county, and special-district services. They sit on top of the 7.25% statewide minimum combined rate and can range from 0.125% to several percent per district. Multiple districts can stack on the same address.

After AB 147, remote sellers who exceed the $500K threshold are deemed to be “engaged in business” in every district where they make sales — meaning you collect every applicable district tax statewide, applied to each shipment based on the ship-to address.

This is a major operational shift from the pre-Wayfair world. There’s no “we only collect the state base rate” option for remote sellers. If a $100 order ships to Los Angeles, you collect Los Angeles’ combined rate (currently around 9.5%, varying by exact address). If the next $100 order ships to a city in San Bernardino County with no extra district tax, you collect 7.75% (state base + Bradley-Burns + countywide). Same store, same product, different rate.

For remote (out-of-state) sellers, sales are sourced to the buyer’s California delivery address — destination-based sourcing. This is different from California’s “modified-origin” rule that applies to in-state retailers (which sources state and mandatory-local tax to the seller’s location).

For you as a remote seller, the rule is simple: the rate is determined by where the package is delivered.

Worked example:

Three orders for the same $100 SKU produce three different tax amounts. The only correct way to handle this is to use CDTFA’s Tax Rate Lookup tool (or a real-time calculation engine that pulls from it) for every transaction.

• Charging only the 7.25% state minimum. Under-collection. CDTFA will assess you for the full district-rate shortfall in audit.
• Using the seller’s California warehouse address for sourcing. That’s the in-state-retailer rule. Remote sellers source to the buyer.
• Hard-coding ZIP-based rates. ZIP codes don’t map cleanly to district boundaries. A single ZIP can span multiple districts. Use address-level lookup.
• Forgetting that district rates change. District tax changes typically take effect on January 1 or April 1. Rates from 18 months ago are stale.

This is the single biggest reason DIY automation breaks for California. The rate engine has to be address-precise and current. Most spreadsheet workflows can’t keep up.

Bottom line: registration is online via CDTFA’s portal. Foreign sellers without an SSN can use an ITIN or, in many cases, a foreign passport or alternative ID for the responsible party.

Before you start the application, gather:

• FEIN/EIN for the business (required for entities). If you’re a foreign company that doesn’t have an EIN, you’ll need to obtain one from the IRS first.
• Responsible party identification. SSN if available; CDTFA’s online registration also accepts ITIN, and for non-US individuals, alternative forms of ID such as a foreign passport, matrícula consular, or non-US driver’s license.
• Officer / member / partner details: name, date of birth, ID number, address.
• Business address (foreign address is acceptable for non-US sellers).
• Projected monthly California sales and products to be sold (NAICS code).
• Banking details for ACH (US bank account preferred but workarounds exist).
• Supplier and bookkeeper references (CDTFA’s online application asks for these).

1. Go to the CDTFA Online Registration portal.
2. Select “Register a New Business Activity” → choose the appropriate sales/use tax option.
3. Complete entity information, responsible-party section, business activity, and projected sales.
4. Submit. There is no fee to register for a Seller’s Permit or Certificate of Registration—Use Tax in California.
5. CDTFA reviews. Typical turnaround is around 7–10 business days for clean online applications, longer if a security deposit is required or if CDTFA needs clarification.

Foreign sellers run into friction at three points:

• No SSN for the responsible party. ITIN is the cleanest substitute. If the principal hasn’t applied for an ITIN, that’s a multi-week IRS process you’ll want to start early.
• No US bank account. ACH is the preferred payment method but not the only one. Credit card payments are accepted (with a convenience fee).
• No US address. Foreign business addresses are accepted on the application; you’ll receive correspondence at that address (or via the online portal).

We’ve registered dozens of UK, AU, NZ, SA, and EU sellers with CDTFA without an SSN, US bank account, or US address. It’s not magical — it just requires knowing which forms of ID CDTFA’s intake team will accept and structuring the application correctly the first time. See our guide to sales tax registration for non-US sellers.

A common confusion: which permit do you actually receive?

• Seller’s Permit — for sellers with sufficient California presence to be considered making in-state sales (e.g., you have a California office, store, or are otherwise an in-state retailer).
• Certificate of Registration—Use Tax — for out-of-state retailers without a California place of business who must collect California use tax (the legal label for what economic-nexus and FBA-inventory remote sellers collect).

Pure out-of-state sellers typically get the Certificate of Registration—Use Tax. Functionally the two work the same way for filing — the difference matters mostly in legal categorization.

CDTFA has discretion to require a security deposit at registration based on factors such as projected liability and compliance history. If you’re registering in California and want to anticipate a possible deposit request, contact us for a current review.. Foreign sellers without US credit history are more likely to face this. The deposit amount is set by CDTFA case-by-case. We’ve seen deposits range widely; budget for the possibility.

Bottom line: CDTFA assigns you monthly, quarterly, or annual filing based on tax liability. Large filers also make mid-month prepayments.

CDTFA reviews assignments periodically and may upgrade or downgrade your frequency based on actual liability.

Weekend and holiday filings roll to the next business day. Filing is mandated electronically through the CDTFA Online Services portal. Zero returns are required — if you’re registered and have no California sales for the period, you still file.

Sellers with average monthly tax liability over $17,000 must make mid-period prepayments under R&TC §6471. Generally:

• Prepayment by the 24th of the month based on a fraction of estimated liability.
• Then a reconciliation return at period end.

Miss a prepayment and you get penalty plus interest on the prepayment shortfall, separately from any return-period penalties.

Under R&TC §6591, California imposes a 10% penalty for failure to file a timely return (exclusive of prepayments); late payment accrues interest rather than a separate penalty under this section.. Failure-to-file penalties can rise to 25% if a return is demanded by CDTFA and not filed within 60 days. Negligence and fraud penalties are separate. Interest accrues on top, at a rate set semi-annually by the State Treasurer.

There is no vendor compensation / timely-filing discount in California. Other states pay you a small percentage for filing on time. California does not.

Bottom line: if you crossed nexus years ago and never registered, the CDTFA Voluntary Disclosure Program limits your exposure to a 3-year look-back and typically waives penalties.

Before deciding on a path, you need to estimate the liability. The framework:

1. Identify when you crossed nexus. Earliest of: (a) the year your CA combined sales first exceeded $500K, or (b) the date FBA inventory first sat in a California warehouse, or (c) when other physical presence began.
2. Estimate California sales by year since that date.
3. Estimate the effective tax rate. Statewide weighted average is ~8.5–9% depending on your customer mix. If your shipments are concentrated in LA / SF / Bay Area, model higher.
4. Add penalty + interest stack. Without VDA: 10–20% penalty plus interest from the original due date of each return. Over 4–5 years of unfiled returns, the penalty + interest stack alone can equal 30–40% of the underlying tax.
5. Subtract marketplace-facilitated sales (Amazon already remitted those — they’re not in your gap).

CDTFA runs an Out-of-State Voluntary Disclosure Program for retailers who should have registered but didn’t. Standard terms:

• Voluntary disclosure look-back periods in California are typically limited, but the available period depends on program eligibility and current CDTFA practice. If you have unregistered CA exposure, contact us for a current review before registering. (vs. potentially open-ended exposure if no return was filed — the SOL extends to 8 years for non-filers).
• Penalties typically waived.
• Interest typically reduced (not always fully waived).
• Anonymous start permitted — you negotiate terms before disclosing your identity.
• You must apply before CDTFA contacts you. Once a notice is in your inbox, the VDA door closes.

A simplified decision framework:

For more detail, see our voluntary disclosure agreements guide.

A VDA negotiation isn’t something you want to handle as a first-time California registrant on your own. The wording of the initial disclosure letter, the period agreed to, and the interest treatment are all negotiable points where experienced representation matters. This is exactly the kind of work our service handles.

Bottom line: California is the single most operationally expensive state to handle in-house. The complexity is district-level, the audit risk is real, and the penalty stack is unforgiving.

For a foreign seller running California in-house, realistic monthly load:

• 2–4 hours/month building or reconciling the return (district-level allocations, marketplace splits, exemption tracking).
• 1–2 hours/month monitoring CDTFA notices, district rate changes, and special notices.
• Variable time responding to CDTFA correspondence, registration changes, banking issues, or representative-party updates.

Add the cost of getting it wrong:

• Under-collected district tax assessed in audit at full rate plus 10–20% penalty plus interest.
• Late-filed returns triggering 10% penalties.
• A single missed prepayment for a >$17K-liability seller can cost more than a year of professional fees.

At Sales Tax Compliance USA, our California scope for a typical client includes:

• Initial nexus assessment and registration (CDTFA online application, security deposit handling, foreign-applicant ID workarounds).
• Monthly or quarterly return preparation, including district-level allocation and marketplace-sale reconciliation.
• Filing and remittance through CDTFA Online Services.
• Notice handling — every CDTFA letter goes to us first, not to you.
• Audit defence if it ever comes to that.
• VDA negotiation if there’s back-tax cleanup.

One flat fee. No software for you to learn. No CDTFA portal for you to log into.

The major SaaS sales tax tools — the major SaaS sales tax platforms — solve rate calculation. That’s the easiest 20% of California compliance.

What they don’t do for you: – Register you with CDTFA (especially as a foreign seller without an SSN). – File your returns (most are file-only add-ons that still require you to review and approve). – Respond to CDTFA notices when district allocations are questioned. – Negotiate a VDA. – Defend you in audit. – Tell you that your Shopify channel just pushed your combined sales past $500K and you’re now retroactively nexus-exposed.

If software is what you need, by all means use it. If what you actually need is for someone to make California go away as an operational concern, that’s not a software product — that’s a service. See our done-for-you sales tax service page.

Ready to hand California off? Book a free consultation — we’ll quantify your exposure, recommend forward-registration or VDA, and give you a fixed quote covering registration through ongoing filing.

If 100% of your sales are facilitated by Amazon as a marketplace facilitator, Amazon collects and remits California tax on those sales. However, if your FBA inventory is stored in a California warehouse, you have physical-presence nexus and must register with CDTFA — even if Amazon handles the actual collection. You’ll typically file zero-tax returns on the marketplace-facilitated sales, but the registration is required.

$500,000 in total combined sales of tangible personal property delivered into California in the current or preceding calendar year, with no transaction-count component.

Yes. Gross sales include marketplace-facilitated sales for purposes of the $500K threshold test, even though the marketplace remits the tax for you. This is the most-missed trap for mixed-channel sellers.

Yes. CDTFA’s online registration accepts an ITIN, and for non-US individuals it accepts alternative forms of identification. The application asks for FEIN at the entity level (which any foreign company can obtain from the IRS) and ID for the responsible party. The exact ID required depends on your specific facts; if you don’t have an SSN or ITIN, contact us for the current acceptable-ID list.

The statewide minimum combined rate is 7.25%, plus district taxes that vary by buyer’s address. The combined rate ranges from 7.25% in low-tax areas to roughly 10.75%–11.25% in the highest-tax cities. Use the CDTFA Tax Rate Lookup for any specific address.

Yes. Once you exceed the $500K economic-nexus threshold, you are required to collect all applicable district taxes statewide, sourced to the buyer’s California delivery address.

You have retroactive exposure. Your two main options are: (1) the CDTFA Voluntary Disclosure Program, which limits look-back to 3 years and typically waives penalties; or (2) forward-only registration, which leaves prior-period exposure technically open. For material exposure, VDA is almost always the right call — and you must apply before CDTFA contacts you. See our voluntary disclosure agreements guide.

CDTFA assigns frequency based on liability: annual (under $100/month), quarterly ($100–$1,200/month), monthly (over $1,200/month), or monthly with prepayments (over $17,000/month average). Most foreign sellers start at quarterly.

It can. CDTFA may require a security deposit at registration based on creditworthiness and projected liability. Foreign sellers without US credit history are more likely to face this. The amount is set case-by-case.

No. A Seller’s Permit is for retailers with sufficient California presence to be making in-state sales. A Certificate of Registration—Use Tax is for out-of-state retailers without a California place of business who collect use tax under economic-nexus or remote-seller rules. Out-of-state FBA and remote sellers typically receive the latter.

Last verified: 2026-05-10

This article is for informational purposes only and does not constitute tax advice. Consult a licensed tax professional before acting on any of this content.