This is general information, not tax advice. Rules change and vary by situation—consult a licensed CPA or tax professional before acting.
Most guides explain nexus like a civics lesson and stop. You already run an operating store, so you need the part they skip: which states you have actually tripped, what it costs to comply, and what an uncollected tax bill does to the margin you are already fighting for. That is the lens here.
What nexus actually means for your store
Nexus is the legal link between your business and a state that obligates you to collect that state's sales tax from buyers there. No link, no obligation. Cross the link, and the state treats you like a local retailer.
There is no federal sales tax—it is a state-and-local tax, so every state writes its own rules. That is why a single store can owe nothing in one state and owe registration plus monthly filings in the one next door.
For an online seller, the whole question reduces to three steps the big guides blur together: figure out where you have nexus, collect the right tax at checkout, and remit what you collected. Miss any step and the gap comes out of your pocket.
Physical nexus: the ties you can see
Physical nexus is the old-school version—a tangible presence in a state. Your home state almost always counts, because that is where you and the business live.
It also includes an employee or contractor working from the state, an office, or inventory stored there. That last one matters for anyone using a fulfillment partner: if goods sit in a 3PL warehouse in a given state, that storage can create nexus on its own.
Print-on-demand operators usually dodge this one. When you sell through Printify, Printful, or Gelato, each item is produced on demand and shipped—nothing sits warehoused in your name across the country. So your physical-nexus map is normally just your home state, not wherever your supplier happens to print. Still, confirm how your supplier routes production before you assume it.
Economic nexus: the one that blindsides operators
Economic nexus is the trap, because it needs zero physical presence. Sales volume alone creates it. This came from the 2018 Supreme Court decision in South Dakota v. Wayfair, which let states tax out-of-state sellers purely on how much they sell in.
Each state sets its own trigger. The most common is $100,000 in sales OR 200 transactions into the state in a 12-month period, according to Shopify's sales tax guide—but the numbers move a lot by state.
Several large states sit much higher. Texas uses a $500,000 threshold with no transaction count, and California also uses $500,000, per Stripe's breakdown of state nexus laws. Meanwhile a growing list of states has dropped the transaction-count test entirely—Illinois removed its 200-transaction threshold effective January 1, 2026, leaving a dollars-only $100,000 test, according to Avalara. Always check the specific state's Department of Revenue; never treat one universal number as fact.
The transaction-count trap, with real numbers
Here is the part operators miss. In a state that still uses "$100,000 OR 200 transactions," the two tests are independent—you trip whichever comes first.
Say your store does 340 orders a month at a $31 average order value. That is about $10,540 in monthly sales spread across the whole country. Now say one mid-size state takes 20 of those orders a month.
Twenty orders a month is 240 orders a year: 20 × 12 = 240. That is past the 200-transaction line. But your sales into that state are only 240 × $31 = $7,440 for the year—nowhere near $100,000.
You now have nexus in that state on $7,440 of sales. The dollars look trivial; the obligation is real. A store pushing volume through Meta and Google ads racks up transaction counts fast, which is exactly why low-dollar, high-order sellers cross these lines in states they never think about. Our full taxes and compliance guide maps how this fits with your other filing duties.
What Shopify does—and the three things it does not
The single biggest misconception is that Shopify "handles sales tax." It handles one of the three steps.
Shopify DOES calculate the correct rate at checkout and collect the tax from your buyer—once you turn it on and tell it where you have nexus. It does not register you with the state, file your returns, or remit the money. Those three are 100% your job, and the tax you collect is never yours to keep—you are holding it for the state.
One nuance trips people up: marketplace facilitator laws make the platform collect and remit for sellers. Every U.S. state with a sales tax now has one, which is why Amazon, Etsy, and eBay handle tax for you. A standard Shopify store is not a marketplace—you are the seller of record and you own all three steps yourself. (The Shop app is the narrow exception, treated as a facilitator for orders placed through it.) If automating collection on your own store is where you are headed, see how Shopify sales tax automation actually works.
The part no nexus article prices: your profit
Nexus is not a compliance footnote—it is a margin event. Registering in a state means ongoing filing work (monthly, quarterly, or annual returns, even for zero-tax months), often a bookkeeper's time, and sometimes a filing fee.
Worse is the tax you failed to collect. If you crossed a threshold months ago and did not know, the state still wants its cut of every sale since. Say that forgotten state rang up $7,440 in sales at a roughly 7% combined rate—that is about $7,440 × 0.07 = $521 you now owe out of pocket, because you never added it to customers' carts. On a store netting a thin operating margin after ad spend, a few of those back-bills can erase a month of profit.
This is why your nexus map and your P&L belong on the same page. The structure matters too: if you are unsure whether to even hold these obligations personally, our note on running an ecommerce store as an LLC walks the entity question.
Where Victor fits
Knowing your true per-order profit is what tells you whether a new state's compliance cost is noise or a real bite. That is the number most sellers never see cleanly.
Victor, the AI employee inside PodVector AI, sees every order, every ad dollar, and every supplier cost from Shopify, Meta Ads, Google Ads, Printify, Printful, Gelato, and Klaviyo together—so he computes the true per-order profit on each product and delivers the reports to your Google Drive. When you weigh registering in a new state or absorbing an uncollected bill, you are deciding against a real margin, not a guess. Every change Victor makes to your campaigns, budgets, prices, or email flows waits for your approval first. Put Victor to work on your numbers.
Victor is not a tax filer and not a substitute for your CPA—he is the operator who keeps your real profit in front of you while you handle compliance.
FAQs
Do I have to collect sales tax in every state?
No. You collect only where you have nexus—your physical-presence states plus any state where you have crossed the economic threshold. For most operators that starts as a short list and grows as order volume spreads. Check each state's Department of Revenue, since thresholds and transaction-count rules differ and change.
What counts as "sales" and "transactions" for the threshold?
It varies by state, and that is the catch. Some states count gross sales (including exempt and marketplace sales), some count only taxable or retail sales. "Transactions" usually means separate orders, which is why a high-order, low-AOV store can cross the 200-transaction line while its dollar volume stays small. Always confirm the specific state's definition.
Does selling through Printify or Printful create nexus in other states?
Usually not on its own. Because print-on-demand items are produced to order rather than stored in your name across states, you typically do not pick up inventory-based physical nexus the way a seller using scattered 3PL warehouses might. Your economic-nexus exposure still depends on where your customers are, so track sales by state regardless. Confirm your supplier's fulfillment routing to be sure.
If I pass a threshold but never collected, what happens?
You generally still owe the uncollected tax, and the state can assess it back to the date you crossed nexus, plus penalties and interest. That liability comes out of your margin because you cannot retroactively charge past customers. The fix is to monitor your sales by state continuously and register promptly once you approach a line. Our guides on handling a Virginia 1099-K and a Square 1099-K cover related reporting duties that often surface at the same time.
Does getting a 1099-K mean I have nexus somewhere?
No—they are unrelated. A 1099-K reports gross payment volume for income-tax purposes; nexus is about sales tax owed to states. You can owe sales tax in a state that never sends you any form, and you can get a 1099-K without new nexus. Treat them as two separate obligations and reconcile both against clean books.
This is general information, not tax advice. Rules change frequently and vary by state and situation—consult a licensed CPA or tax professional before acting.