The Silent Value Killer.
In 2018, the Supreme Court changed the rules of the internet. You no longer need an office to owe tax. If you ship too many boxes to a state, you became a tax collector for that state overnight.
A guide by Taxstra Tax & Accounting — CPA-led tax strategy for business owners
Introduction: Physical vs. Economic Nexus
How South Dakota v. Wayfair rewrote the rules for every online seller
For decades, the standard was set by Quill Corp v. North Dakota (1992). The rule was: "No Physical Presence = No Tax." If you didn't have a warehouse, employee, or office in a state, you could sell millions of dollars of goods into that state tax-free.
States hated this. They watched Amazon and Wayfair explode while local brick-and-mortar stores withered. They were losing billions in tax revenue.
In 2018, South Dakota v. Wayfair, Inc. overturned everything. The Supreme Court ruled that "Physical Presence" is an outdated concept in the digital age. They introduced "Economic Nexus."
Now, simply having a significant "economic impact" in a state creates a tax obligation.
The $100k / 200 Transaction Rule
While every state sets its own laws, South Dakota's model became the standard adopted by most:
- • $100,000 in Gross Sales (into that state)
- OR
- • 200 Separate Transactions (into that state)
The Transaction Trap: This is what kills small businesses. If you sell $15 widgets, 200 transactions is only $3,000 in revenue. Yet, in many states, hitting transaction #200 requires you to register, collect, and remit sales tax, regardless of the low revenue.
"But I sell Software/Services!"
Why SaaS founders are not exempt from economic nexus
Many founders think: "I sell SaaS. I don't ship boxes. I'm safe."
YOU ARE NOT SAFE.
States are increasingly classifying SaaS (Software as a Service) as a taxable digital good.
| Treatment | States |
|---|---|
| Taxable States | New York, Texas, Pennsylvania, Massachusetts, Washington, Ohio, and ~20 others. |
| Exempt States | California, Florida, Virginia (generally exempt for pure SaaS, but distinct nuances apply). |
If you have 500 customers in New York paying $50/month, you have Nexus. You owe New York ~8.875% of that revenue. If you haven't been collecting it, you owe it out of your own pocket.
The "Marketplace Facilitator" Exception
When Amazon, Etsy, or Walmart collects the tax for you
If you sell exclusively on Amazon FBA, Etsy, or Walmart.com, you might be lucky.
Most states have passed "Marketplace Facilitator Laws." These laws force Amazon to collect and remit the tax FOR you. You effectively get a pass because Amazon is the one handling the money.
However:
1. Some states still require you to register and file a "$0 return" just to report the gross sales.
2. If you sell on your own Shopify site + Amazon, the Amazon sales often count toward the threshold (the $100k limit) that triggers nexus for your Shopify store.
The Assessment: What If I'm Non-Compliant?
How unpaid sales tax kills deals when you sell your company
This is the scariest part of due diligence when selling a company. We see deals die because of this.
Imagine you want to sell your e-commerce brand for $5M. The buyer does a tax audit. They find you have had nexus in California for 4 years but never collected tax.
California Tax: 7.25%.
Sales: $1M/year x 4 years = $4M.
Unpaid Tax: $290,000.
Penalties & Interest: +50% (~$145,000).
Total Liability: $435,000.
The buyer will deduct $435,000 from your purchase price immediately. You just lost half a million dollars because you didn't turn on a setting in Shopify.
The Fix: Voluntary Disclosure Agreements (VDA)
How to come into compliance without triggering years of penalties
If you realize you have exposure, DO NOT just register on the state website.
If you register simply, the form asks: "Date business began?" You date it "2020." The computer instantly flags you for 4 years of back returns and penalties.
Instead, we use a Voluntary Disclosure Agreement (VDA).
We hire a lawyer/CPA to approach the state anonymously. We say: "We represent a client who wants to come into compliance. If they register and pay back taxes, will you waive the penalties?"
Most states say YES. They want the future revenue. A VDA typically:
- Waives 100% of penalties.
- Limits the "look-back" period (usually 3 or 4 years), forgiving tax older than that.
- Keeps you off the "Audit List."
Related strategies and resources:
Sales Tax FAQ
The questions e-commerce and SaaS owners ask most
Stop The Bleeding.
The longer you wait, the bigger the penalty check becomes. Let us run a Nexus Study to determine your exact exposure today.
Find Out What You're Overpaying in Taxes
Book a free 30-minute call to walk through your situation. We'll tell you exactly how our CPA-led team can help — and whether we're the right fit.