If you sell on both Amazon and Shopify, Shopify tax exemptions and sales tax collection work very differently from what Amazon handles on your behalf, and most multichannel sellers have not fully worked out what that means for their obligations. Amazon’s marketplace facilitator status is real and it covers a lot, but it stops at the edge of your Amazon storefront. The moment a customer buys from your Shopify store, you are in different territory entirely.
The short answer: Amazon collects and remits sales tax on covered Amazon transactions. Your Shopify store does not work the same way, and the gap between those two realities is where multichannel sellers tend to carry tax exposure they did not realise they had.
What You’ll Learn
• Amazon’s marketplace facilitator status covers sales tax on Amazon transactions, but it does not resolve your Shopify store’s separate tax obligations
• Shopify gives you tools to collect sales tax, but nexus determination, registration, filing, and remittance are your responsibility as the seller
• Economic nexus thresholds vary by state, and your combined revenue across Amazon and Shopify may have already triggered a filing requirement you have not addressed
• Shopify tax exemptions apply to qualifying buyers like resellers and exempt organisations, but the seller must collect valid exemption certificates and requirements differ by state
• Multichannel sellers running both platforms need a single, consolidated view of their sales tax exposure, not separate platform-by-platform assumptions
Table of Contents
1. Why Multichannel Sellers Get This Wrong
2. How Amazon’s Marketplace Facilitator Status Actually Works
3. What Is Shopify’s Role in Sales Tax Collection?
4. What Economic Nexus Means for Your Shopify Store
5. How Shopify Tax Exemptions Work and When They Apply
6. The Amazon-Plus-Shopify Scenario: Where Tax Exposure Can Appear
7. What Seven-Figure Multichannel Sellers Should Do Now
8. Questions Multichannel Sellers Ask About Shopify Tax and Amazon Obligations
Why Multichannel Sellers Get This Wrong
The mistake is understandable. Amazon has been collecting and remitting sales tax on marketplace transactions in every U.S. state for years now, and for sellers who started on Amazon, tax just sort of… got handled. You saw the line items in your settlement report. You noticed Amazon was dealing with it. Over time, a reasonable assumption formed: sales tax is Amazon’s problem.
Then you launched a Shopify store.
And you carried that same assumption with you into a platform that works completely differently.
This is not a rare situation. A lot of sellers expanding to Shopify treat it as an extension of their Amazon business, operationally and financially. But from a sales tax standpoint, your Shopify storefront is an independent sales channel where you, as the seller, are directly responsible for the entire compliance chain. That includes proper ecommerce tax planning from the start, not just after a notice arrives.figured in the first place. That configuration is not a one-time setup that runs itself. It requires ecommerce accounting knowledge to get right.
The good news is that once you understand how each platform actually works, the path forward is clear. Let me walk through it.
How Amazon’s Marketplace Facilitator Status Actually Works
A marketplace facilitator is a platform that facilitates sales between third-party sellers and buyers, and that takes on the legal responsibility to collect and remit sales tax on those sales under state marketplace facilitator laws. Amazon qualifies as a marketplace facilitator in every U.S. state that has a sales tax.
In practical terms, this means:
• Amazon calculates the applicable sales tax on transactions made through its marketplace
• Amazon collects that tax from the buyer at checkout
• Amazon remits the collected tax directly to the relevant state tax authority
• The seller receives settlement payments that reflect this, with sales tax collection handled outside the seller’s direct control
This covers the vast majority of Amazon marketplace transactions. For most sellers, it means you are not directly filing sales tax returns for Amazon sales in most states, because Amazon has already handled collection and remittance.
What marketplace facilitator status does not cover:
• Sales made through your own Shopify store
• Sales made through other channels you operate independently
• State income tax obligations arising from FBA inventory creating physical nexus
• Economic nexus thresholds triggered by your combined cross-channel revenue
Amazon’s marketplace facilitator status means Amazon collects and remits sales tax on covered marketplace transactions, but it does not apply to sales made through your Shopify storefront, where the seller remains directly responsible.
For a deeper look at how Amazon specifically handles the sales tax side, the article on how Amazon handles sales tax for sellers covers the mechanics in more detail.
What Is Shopify’s Role in Sales Tax Collection?
This is where the confusion tends to compound. Shopify is not a marketplace facilitator. It is an ecommerce platform. That is a meaningful distinction.
Shopify provides tools that allow you to configure sales tax collection in your store. You can set up tax rates by state, apply product-specific tax rules, configure customer exemptions, and use Shopify’s built-in tax calculation features. If you set everything up correctly, Shopify will collect sales tax from your customers at checkout and hold those funds for you to remit.
The key phrase is “for you to remit.”
Shopify provides tools that allow sellers to collect sales tax from customers, but the responsibility for determining where you have nexus, registering in those states, and filing returns belongs to the seller, not the platform.
Here is what Shopify does not do for you:
• Determine which states you have nexus in
• Register you with state tax authorities
• File sales tax returns on your behalf
• Remit collected tax to the states
• Notify you when you cross an economic nexus threshold in a new state
The difference between what Amazon does and what Shopify does is significant. With Amazon, the platform handles the full compliance chain for marketplace sales. With Shopify, the platform gives you collection tools and you handle everything else.
Understanding this distinction is the foundation for getting your multichannel seller tax differences sorted out correctly.
What Economic Nexus Means for Your Shopify Store
Economic nexus is the concept that a seller can have a sales tax filing obligation in a state based purely on the volume of sales into that state, even without any physical presence there. Prior to the 2018 South Dakota v. Wayfair Supreme Court decision, physical presence was generally required to establish nexus. After Wayfair, states were given the authority to impose nexus based on economic activity alone.
Every state with a sales tax has now adopted its own economic nexus rules. The thresholds and transaction count rules vary by state, and they change over time, so I am not going to list specific numbers here that could be outdated by the time you read this. What I can tell you is the structure:
• Most states set a revenue threshold based on total taxable sales into that state in a calendar year or rolling 12-month period
• Some states also use a transaction count threshold alongside the revenue threshold
• Once you cross a state’s threshold, you are generally required to register for a sales tax permit in that state and begin collecting and remitting
Here is the part that matters for multichannel sellers: economic nexus thresholds are generally calculated based on your total taxable sales into a state, across all channels. You cannot treat your Amazon sales and your Shopify sales as separate businesses for nexus purposes.
If your combined Amazon and Shopify revenue into a particular state crosses that state’s threshold, you likely have nexus in that state. And if Amazon is already handling the collection and remittance for your Amazon sales there, that does not eliminate your obligation on the Shopify side. You may need to register independently for your Shopify sales and file returns covering that channel.
This is one of those areas where a lot of ecommerce sellers are behind without realising it, particularly those who have been growing quickly across channels.
How Shopify Tax Exemptions Work and When They Apply
Shopify tax exemptions apply when a qualifying buyer is legally not required to pay sales tax on their purchase. The two most common situations in the ecommerce context are:
Resale exemptions: A buyer who purchases your products for resale (a retailer, wholesaler, or distributor) is generally not required to pay sales tax on that purchase because they will collect sales tax from their own end customers when they sell the product.
Exempt organisations: Certain organisations, including qualifying nonprofits, government entities, and educational institutions, may be exempt from sales tax depending on state rules.
Within Shopify, you can configure tax exemptions at the customer level. When a customer’s account is marked as tax exempt, Shopify will not apply sales tax to their orders. You can also configure product-level tax overrides for specific item categories that your state treats as exempt.
The practical responsibility falls on you as the seller:
1. Determine which buyers in your Shopify store qualify for an exemption
2. Collect a valid exemption certificate from each qualifying buyer before processing tax-exempt orders
3. Store those certificates properly in case of an audit
4. Understand that exemption certificate requirements vary by state
A Shopify tax exemption is only as valid as the exemption certificate you collect from the buyer; without a properly completed certificate on file, the seller carries the liability if that transaction is later audited.
This is not a theoretical concern. State auditors routinely review exemption certificate files during sales tax audits. If you have been processing orders as tax-exempt without collecting certificates, or collecting certificates that do not meet a particular state’s requirements, the liability stays with you.
For sellers doing any meaningful volume of B2B or wholesale orders on Shopify, getting an exemption certificate process in place before it becomes urgent is significantly easier than trying to collect documentation retroactively.
The Amazon-Plus-Shopify Scenario: Where Tax Exposure Can Appear
Let me walk through a scenario that reflects what I see regularly. The numbers are rounded for illustration.
A branded product seller doing $2.4 million in annual revenue operates across Amazon (roughly $1.8 million) and Shopify (roughly $600,000). They started on Amazon five or six years ago and have been on Shopify for the last two years. They have never had a sales tax conversation beyond confirming that Amazon handles it.
On the Amazon side, marketplace facilitator rules are working correctly. Amazon is collecting and remitting sales tax on covered transactions. The seller’s settlement reports show this. There are no obvious problems on that side.
On the Shopify side, the store launched with Shopify’s default tax settings configured for the seller’s home state. The seller has been collecting sales tax from customers in that state and remitting it quarterly. They have not assessed whether their $600,000 in Shopify revenue, combined with their Amazon revenue in other states, has crossed economic nexus thresholds elsewhere.
In several states, the combined revenue has crossed the threshold. The Shopify store has been collecting no sales tax from customers in those states. No registrations have been filed. Returns have not been submitted.
The ecommerce bookkeeping side tells a related story: this seller’s QuickBooks file shows Amazon revenue and Shopify revenue merged into a single income account. There is no clean separation, no channel-level reporting, and no way to easily pull together the data needed for a state nexus analysis without going back through two years of transactions.
As Steven Freshour has said in client situations directly: “Rather than defending yourself, it’s important to get the reporting right the first time around.”
That framing applies exactly here. Reviewing and correcting your multichannel tax position before an audit is always the right call.
Here is a summary comparison of how the two platforms handle the core tax responsibilities:
| Responsibility | Amazon (Marketplace) | Shopify (Your Store) |
| Nexus determination | Amazon handles for covered sales | Seller’s responsibility |
| Sales tax calculation | Amazon handles | Shopify tools available; seller configures |
| Tax collection from buyer | Amazon collects | Seller collects via Shopify checkout |
| Remittance to states | Amazon remits | Seller remits |
| Exemption certificate collection | Not applicable to seller | Seller’s responsibility |
| Filing sales tax returns | Amazon files for marketplace sales | Seller files |
This table reflects the general framework. Your specific obligations depend on your revenue, the states you sell into, your product categories, and your business structure. State rules differ and they change, which is why professional review matters.
What Seven-Figure Multichannel Sellers Should Do Now
The ecommerce sales tax obligations picture for a multichannel seller is more complex than most people expect, but it is also manageable if you approach it systematically. Here is where to start.
Step 1: Assess your nexus exposure across both platforms
Pull your Shopify sales by state and your Amazon sales by state for the past 12 to 24 months. Look at the combined numbers. Identify the states where your total taxable sales are approaching or may have crossed nexus thresholds. This is the foundation for everything else.
Do not assume Amazon handling your Amazon sales means you have no Shopify obligations in those same states.
Step 2: Confirm your Shopify tax settings are correctly configured
Review your Shopify tax settings against your actual nexus obligations. Make sure you are collecting in every state where you have nexus, not just your home state or the states you originally configured. Check that product tax categories are set correctly, particularly if you sell items that have state-specific exemptions.
Step 3: Establish an exemption certificate process if you have B2B or wholesale buyers
If any of your Shopify customers are resellers or exempt organisations, set up a process for collecting certificates before processing their first tax-exempt order. Decide where you will store those certificates (a dedicated folder, your CRM, your client management software) so they are accessible if you ever need them.
Step 4: Separate Amazon and Shopify revenue in your books
Your bookkeeping needs to reflect each channel separately. This matters for sales tax analysis, for profitability tracking by channel, and for accurate tax return preparation. If your current setup merges the two, that is worth fixing now rather than trying to untangle it under pressure.
The ecommerce tax filing side of this conversation is the downstream benefit of getting the books and nexus picture right. When your records are clean and your channel-level data is accurate, tax filing becomes significantly more straightforward.
Step 5: Work with a CPA who understands both platforms
Shopify versus Amazon tax compliance is not a question you should be answering by reading platform help documentation or hoping your bookkeeper has it covered. A specialist who works exclusively with ecommerce sellers will know what a state nexus analysis looks like for a multichannel seller, understand how FBA inventory may independently create physical nexus in certain states, and help you get into compliance in a way that minimises exposure rather than just reacting to a notice.
Sellers across the U.S., from Texas and Florida to California and New York, are navigating this same challenge as they scale from a single channel to two or three. The states with the highest ecommerce seller populations also tend to have active enforcement programs. Getting ahead of your obligations is the practical approach.
Not sure whether your books are set up to handle both platforms correctly? Start with the free ecommerce bookkeeping self-review. It will show you where the gaps are, so you know what to address first.
Key Takeaways
• Amazon’s marketplace facilitator status is real and covers most Amazon marketplace transactions, but it stops at the edge of your Amazon storefront
• Shopify is a collection tool, not a compliance solution; nexus determination, registration, filing, and remittance are your responsibility as the seller
• Economic nexus is assessed on combined revenue across all channels, not per platform
• Shopify tax exemptions require valid exemption certificates on file; without them, the liability sits with you as the seller
• Multichannel sellers need a consolidated view of their tax exposure, clean channel-level bookkeeping, and a CPA who understands how both platforms work
If your business has grown past seven figures across Amazon and Shopify and you have not had a formal sales tax nexus review, that conversation is worth having sooner rather than later.
Book a discovery call with The Seller CPA to review your multichannel tax position.
Questions Multichannel Sellers Ask About Shopify Tax and Amazon Obligations
Does Amazon’s marketplace facilitator status cover my Shopify sales?
No. Amazon collects and remits sales tax on covered Amazon marketplace transactions on your behalf, but this applies only to sales made through Amazon. Your Shopify storefront is a separate sales channel, and you are directly responsible for determining nexus, collecting tax, and remitting it to the relevant states. The two platforms operate under entirely different frameworks.
Does Shopify automatically collect and remit sales tax for me?
Shopify provides tools that enable you to collect sales tax from customers, but the platform does not determine where you have nexus, register you in new states, file your returns, or remit tax on your behalf. Those responsibilities sit with the seller. Getting the configuration right requires understanding your specific nexus obligations first, which means doing the nexus analysis before you touch the tax settings.
What are Shopify tax exemptions and who qualifies for them?
Shopify tax exemptions allow certain buyers, such as resellers holding a valid resale certificate or qualifying exempt organisations, to purchase without paying sales tax. The seller is responsible for collecting a valid exemption certificate from the buyer and storing it. Requirements for what constitutes a valid certificate vary by state, so sellers handling B2B or wholesale orders should verify the rules in each relevant state before processing tax-exempt transactions.
Can FBA inventory create sales tax nexus in states where I also have Shopify customers?
Storing inventory in Amazon FBA warehouses may independently create physical nexus in the states where those warehouses are located, separate from any economic nexus threshold. This means you could have a filing obligation in a state based on your FBA inventory alone, which also applies to your Shopify revenue from customers in that state. The specific rules vary, so professional advice is important for your situation.
If I sell on both Amazon and Shopify, do I need to combine my revenue to calculate economic nexus?
Economic nexus thresholds are generally assessed at the state level based on your total taxable sales into that state, which typically includes revenue from all channels including both Amazon and Shopify. You cannot treat each platform as a separate entity for nexus purposes. A specialist who understands both platforms can help you assess your combined exposure accurately and identify which states need attention.
What happens if I sell to an exempt buyer on Shopify without collecting an exemption certificate?
If you process a tax-exempt sale without a valid exemption certificate on file and that transaction is later audited, the tax liability generally falls on you as the seller. States have different rules about what constitutes an acceptable certificate and how long you have to collect one. Getting the process in place before you receive a wholesale or reseller inquiry is far easier than trying to collect documentation after the fact.
Ready to Sort Out Your Multichannel Tax Position?
If you are running both Amazon and Shopify and you are not fully confident your sales tax obligations are covered on both sides, the place to start is your bookkeeping. Clean, channel-separated books are the foundation for an accurate nexus analysis and everything that follows.
The free ecommerce bookkeeping self-review is a self-assessment tool built specifically for ecommerce sellers. It will score the health of your current setup and flag the areas most likely to create tax and reporting problems. Take 10 minutes to run through it and see where you actually stand.
If you are ready to talk through your specific situation with a CPA who works exclusively with ecommerce founders, get in touch here.
