Why Did California Send Me a $9,000 Sales Tax Bill in 2026 — When I Only Sell on Amazon FBA?

Updated: 2026-07-25•SafeBridge Insurance Group

You opened a Shopify store or an Amazon FBA account from your kitchen in Brooklyn, never set foot in California, and one morning a notice arrives: California wants $9,000 in back sales tax. This is not a scam. It is economic and physical nexus — and for Russian-speaking sellers it is the single most expensive surprise of 2026.

What Is Sales Tax Nexus and Why Should an Amazon Seller Care?

"Nexus" is the legal connection between your business and a state that gives that state the right to make you collect and remit its sales tax. Before 2018 you needed a physical presence. Then the Supreme Court decided South Dakota v. Wayfair (2018), and everything changed.

Today there are two kinds of nexus you can trigger without ever visiting a state:

Economic nexus — you cross a sales threshold (typically $100,000 in sales OR 200 transactions per year in that state).
Physical nexus — you store inventory in that state. Amazon FBA does exactly this, in warehouses across many states, often without telling you clearly.

What Are the Economic Nexus Thresholds in 2026?

Thresholds vary by state. These are typical 2026 figures (estimates, not guarantees — always verify with the state's department of revenue):

State	Sales threshold	Transaction threshold	Typical rate
California	$500,000	None	~7.25%+
New York	$500,000	100 transactions	~8.0%
New Jersey	$100,000	200 transactions	~6.625%
Florida	$100,000	None	~6.0%
Texas	$500,000	None	~6.25%

The classic trap: a small state like New Jersey at $100,000 OR 200 transactions means 200 orders of $40 each — only $8,000 in revenue — can already trigger registration.

What Do Marketplace Facilitator Laws Do for Me?

Here is the relief. Marketplace facilitator laws (now in nearly every state) force Amazon, Etsy, and eBay to collect and remit sales tax on your behalf for sales made through their platform. So if 100% of your sales are on Amazon, the platform usually handles collection.

But two things still bite Russian-speaking sellers:

Registration still matters. Several states still want you registered for a sales tax permit even when the marketplace collects — to report the marketplace sales as exempt/deductions.
Off-marketplace sales. The moment you sell through your own Shopify store, the facilitator does NOT cover those — you collect and remit yourself.

What Is a Resale Certificate and Why Do I Want One?

A resale certificate lets you buy inventory from suppliers tax-free, because the tax will be collected when the final customer buys it. Without it, you pay sales tax on your wholesale purchases and eat the cost. Most states issue it free when you register for a sales tax permit. See the SBA tax guide for the basics.

Origin vs Destination — Which Rate Do I Charge?

Destination sourcing (most states): you charge the tax rate of the buyer's location.
Origin sourcing (a few states): you charge based on your location.

With thousands of local rates, manual tracking is impossible past a few states. That is why sellers use TaxJar or Avalara to auto-calculate, register, and file.

Typical Scenarios

Case 1: Sergey, Brooklyn 11229 — The $9,000 FBA Surprise

Sergey ran a single-product Amazon FBA store from his apartment in Brooklyn 11229. He assumed Amazon "handled everything." But Amazon had spread his inventory across 18 states for faster shipping — creating physical nexus in each. California audited, found unregistered physical presence in its warehouses for prior years, and sent a back-tax-and-penalty notice totaling about $9,000. Because he never registered, he — the owner — was personally liable. He resolved it by registering, filing back returns, and enrolling TaxJar to monitor where Amazon stores his stock.

Case 2: Marina, Edison NJ 08817 — Doing It Right

Marina, a Shopify + Amazon seller in Edison NJ 08817, registered for a NJ sales tax permit, pulled a free resale certificate to buy inventory tax-free, and connected TaxJar. Amazon collected and remitted on marketplace orders; TaxJar handled her Shopify sales and flagged when she neared the $100,000 / 200-transaction line in new states. She paid roughly $19/month for software instead of a five-figure audit bill.

How Do I Stay Out of Trouble?

Check the FBA Inventory report monthly to see which states store your goods.
Register where you have physical or economic nexus.
Use TaxJar/Avalara to auto-file; the IRS small-business hub covers income-tax overlap (and your EIN).
Keep the resale certificate on file with suppliers.

Sales tax is not federal — it is a 50-state patchwork, and the owner is the one who pays when it goes wrong. Spend $20/month on software, not $9,000 on a notice. Check the NAIC directory if you also need business insurance to protect the entity.

SafeBridge connects Russian-speaking immigrants in NY, NJ, and FL with licensed professionals. SafeBridge is not a licensed insurance agency, law firm, or tax advisor — consult a licensed professional before acting. Call (315) 871-0833 · WhatsApp +1 (929) 347-4410 · data@truckernavi.com.

Frequently Asked Questions

What triggers sales tax economic nexus?+

Typically $100,000 in sales OR 200 transactions per year in a state, per South Dakota v. Wayfair (2018). Thresholds vary; some states dropped the 200-transaction test.

Does Amazon FBA create nexus for me?+

Yes. FBA stores your inventory across many states, creating physical nexus in each — even states you've never visited or sold to directly.

If Amazon collects sales tax, do I still need to register?+

Often yes. Marketplace facilitator laws make Amazon remit, but several states still require a sales tax permit so you can report marketplace sales as exempt.

Why did California send me a $9,000 back-tax notice?+

Likely FBA inventory created physical nexus in CA warehouses for years you weren't registered. Owners are personally liable for back tax plus penalties.

What is a resale certificate?+

It lets you buy inventory tax-free from suppliers since tax is collected at final sale. Most states issue it free when you register for a sales tax permit.

Origin or destination sourcing — which do I use?+

Most states use destination (buyer's rate); a few use origin (your rate). Software like TaxJar or Avalara applies the correct local rate automatically.

What does TaxJar or Avalara cost?+

Plans typically start around $19/month for small sellers and scale up; far cheaper than a five-figure audit. They auto-calculate, register, and file.

Do Shopify sales count differently from Amazon?+

Yes. Marketplace facilitator laws don't cover your own Shopify store — you must collect and remit those sales yourself once you have nexus.

Can the LLC shield me from personal liability for unpaid sales tax?+

Usually not. Sales tax is a trust-fund tax; states frequently hold the owner or responsible person personally liable for uncollected amounts.

How do I see which states hold my FBA inventory?+

Pull the Amazon FBA Inventory report. It lists fulfillment-center locations by state so you can register where you actually have physical nexus.

Is sales tax federal?+

No. There is no federal sales tax; it's a 50-state patchwork of rates and rules, which is why automation and per-state registration matter.