Marketplace Sales Tax in 2026: What Sellers Get Wrong (and What to Do Instead)

If you sell on Amazon, Shopify, or any marketplace, you probably assume sales tax is handled for you.

That assumption is where many businesses get into trouble.

Marketplace sales tax rules in 2026 are more complex than they look, and enforcement is increasing across multiple states.

While marketplace facilitator laws cover a large portion of transactions, they don’t cover everything — and the gaps are where businesses get exposed.

What Is Marketplace Sales Tax (and Why It’s Confusing)?

Marketplace facilitator laws require platforms like Amazon, Walmart, and others to collect and remit sales tax on behalf of sellers for transactions that happen on their platform.

Sounds simple, right? Not exactly.

These laws vary by state, and more importantly, they don’t always apply to:

• Sales made outside the marketplace (like your Shopify store)
• Certain digital products or SaaS
• B2B transactions with exemption certificates
• Fees, subscriptions, or bundled services

This is where most businesses get caught off guard.

What’s Changing in 2026?

States are not necessarily rewriting marketplace laws — they’re enforcing them more aggressively.

Here’s what we’re seeing:

• More audits targeting marketplace sellers
• Stricter interpretation of what marketplaces actually cover
• Increased focus on multi-channel sellers
• Data-sharing between states and platforms

In other words: states are closing the gap between what businesses assume and what the law actually requires.

The Biggest Mistake: “The Marketplace Handles Everything”

This is the most common (and expensive) misunderstanding.

Marketplace facilitators only handle tax for transactions that happen on their platform.

If you also sell:

• Through your own website (Shopify, WooCommerce, etc.)
• Via direct invoices
• Through subscriptions or SaaS platforms

You may still have sales tax obligations in multiple states.

And yes — that includes registering, collecting, filing, and remitting tax yourself.

Who This Affects the Most

If your business falls into any of these categories, this applies to you:

• Multi-channel sellers (Amazon + Shopify)
• eCommerce brands scaling across states
• SaaS or digital product companies
• Businesses selling both B2C and B2B

The more channels you sell through, the higher the risk of gaps in compliance.

Why States Are Paying More Attention

After the Wayfair decision, states gained the ability to enforce sales tax based on economic activity — not just physical presence.

Now, with marketplace data and reporting tools improving, states have better visibility than ever into:

• Where you’re selling
• How much revenue you’re generating
• Whether you’ve registered or not

This is why enforcement is increasing in 2026.

What Your Business Should Do Now

If you rely on marketplaces, this isn’t something to ignore.

At a minimum, you should:

• Identify where you have economic nexus
• Separate marketplace vs. non-marketplace sales
• Review taxability of your products/services
• Confirm whether you need to register in additional states

Most businesses don’t have a visibility problem — they have a clarity problem.

The Bottom Line

Marketplace facilitator laws simplified sales tax — but they didn’t eliminate your responsibility.

In 2026, the risk isn’t misunderstanding the rules.

It’s assuming they don’t apply to you.

If you’re selling across multiple channels, there’s a good chance you have obligations you’re not fully accounting for.

Not Sure Where You Stand?

That’s where most businesses get stuck.

Our team works exclusively with multi-state businesses to identify exposure, clean up compliance, and keep you protected as you grow.

👉 Talk to a sales tax specialist today and get clarity before it turns into a liability.