Most sellers who ask about marketplace sales tax are asking one of six questions, and the answers have been reasonably settled since 2019. Marketplaces collect and remit for the sales they facilitate in the states that have passed facilitator laws. You still have obligations of your own, and they do not disappear because Amazon is handling collection. What follows describes how the rules generally work. Sales tax is state law, it changes, and nothing here substitutes for your state’s revenue department or your own accountant.
If Amazon collects the tax, do I still have to register?
Sometimes. It depends on whether all of your sales into a state run through a registered marketplace, and on whether you have crossed that state’s economic nexus threshold.
Texas puts the marketplace-only case plainly. Its Comptroller’s remote seller guidance, updated in May 2026, states that a remote seller who only sells through a marketplace provider that certifies it is collecting and reporting on the seller’s behalf is not required to hold a Texas tax permit. The same page adds a condition sellers skip over: all sellers must keep required records of all marketplace sales for at least four years.
California is stricter about what counts toward your threshold. The California Department of Tax and Fee Administration’s guide to the Marketplace Facilitator Act says economic nexus means combined sales for delivery into California exceeding $500,000 in the preceding or current calendar year, and that you must include sales facilitated through a marketplace facilitator’s marketplace in that count. So a seller can be under the threshold on their own website, over it once Amazon volume is included, and required to register for the direct sales even though the marketplace covers the rest.
What is a marketplace facilitator, exactly?
It is a two-part test in most states, and California’s version is a useful model. The facilitator has to do something structural and something transactional.
Under the CDTFA guide, a marketplace facilitator must do at least one of: transmit the offer or acceptance between buyer and seller, own or operate the infrastructure or technology that brings them together, provide a virtual currency for purchases, or perform related software development. It must also do at least one of: payment processing, fulfillment or storage, listing products, setting prices, branding sales as its own, order taking, or providing customer service and handling returns.
A site that merely advertises your product and refers the buyer to you by link is not a facilitator for that sale. That distinction matters for affiliate and comparison-shopping traffic.
What are the thresholds?
They vary by state, and the number is only half the rule. The measurement period and the deadline to start collecting are the other half.
Texas sets a safe harbor at total Texas revenue of less than $500,000 in the preceding twelve calendar months. A seller who exceeds it must obtain a permit and begin collecting no later than the first day of the fourth month after the month in which the threshold was crossed. That is a real grace period, and it is not universal.
California uses $500,000 in the preceding or current calendar year, with related-party sales included. Some states use a lower dollar figure, some previously used a transaction count, and several have dropped transaction counts in recent years. Check the state, not a summary table from two years ago.
Do I still file a return if the marketplace collected everything?
If you are registered in that state, generally yes. Being registered and having no tax to remit are different situations.
CDTFA is specific here: a registered marketplace seller is required to continue reporting total sales on its sales and use tax returns, including sales made through a marketplace, and then may claim a deduction as “other” for the sales on which the facilitator is responsible. The gross number goes on the return; the deduction takes it back out. Sellers who omit facilitated sales end up with returns that do not tie to their books or to their 1099-K.
What happens if the marketplace collects the wrong amount?
In California, the seller is generally protected. CDTFA states it will not hold a marketplace seller liable for tax on a facilitated transaction if it can verify that the facilitator in fact collected the correct amount and paid it to the department.
The practical burden is documentary. CDTFA recommends obtaining an agreement or other documentation showing the facilitator is registered and responsible for the tax, along with the facilitator’s seller’s permit or account number, which can be verified through the department’s own lookup. This is the paperwork nobody keeps and everybody wants during an audit.
How does sales tax show up in my books?
As a liability when you collect it, not as revenue. This is the single most common error in ecommerce bookkeeping, and it inflates reported sales by the full amount of tax collected.
Marketplace-collected tax complicates the picture because the money often never lands in your bank account as a separate line. It appears inside a settlement, netted against fees, refunds, and reserves. Reconciling that requires reading the settlement report rather than the deposit. Tools built for this problem, including A2X, Webgility, and ConnectBooks, exist mainly because the settlement and the deposit are not the same document, and a bank feed alone cannot tell them apart.
Rate detail compounds it. California’s statewide rate is 7.25 percent, which CDTFA notes already includes 1.25 percent of local taxes, with voter-approved district taxes layered on top in many jurisdictions. Texas offers remote sellers an alternative single local use tax rate, currently 1.75 percent, published in the Texas Register by January 1 each year and not available to marketplace providers. A single “sales tax collected” account will not tell you whether you are allocating local tax correctly.
What about the 1099-K I get from each marketplace?
It reports gross payments, not net profit, and it will not match your bank deposits. The IRS requires third party settlement organizations to issue Form 1099-K when payments for goods or services exceed $20,000 in more than 200 transactions, though platforms may issue one for lower amounts.
Two things follow. Selling on several platforms can produce several forms, each reporting gross. And the IRS is explicit in its guidance on the form that you must report income on your return whether or not you receive one. The 1099-K is a cross-check on your revenue account, and if it does not tie, the gap is usually fees, refunds, or a timing difference at year end rather than an error on the form.
Where to get answers
Start with the revenue department of the state in question. Most publish a marketplace facilitator page, a nexus page, and a registration path, and those pages are updated when the statute changes in a way that no third-party chart is. The Multistate Tax Commission and the Federation of Tax Administrators, both of which the Texas Comptroller points remote sellers toward, are useful for orientation across states.
Then talk to someone who does this professionally. A seller crossing into five or six new states in a single quarter is making a registration decision with real filing consequences, and the cost of a consultation is small next to the cost of registering somewhere you did not need to and inheriting a filing obligation that outlasts the sales.