Expanding your business into the United States is a milestone for any international seller, but it comes with a complex set of rules. In 2026, the landscape of US sales tax has shifted toward simplification, yet the stakes for non-compliance are higher than ever. To succeed, you must understand "nexus": the legal link that determines whether a state can require you to collect and remit sales tax.
Navigating 50 different sets of rules can feel overwhelming. However, once you grasp the fundamentals of physical and economic nexus, you can protect your business from costly audits and retroactive penalties. At Sterlinx Global, we act as your compliance partner, taking the data from your sales channels and ensuring your filings are accurate and on time.
What Exactly is Sales Tax Nexus?
Nexus is a legal term for a "sufficient connection" between your business and a US state. If you have nexus in a state, you are legally obligated to register for a sales tax permit, collect tax from customers in that state, and file regular returns.
In 2026, nexus is broadly divided into two categories: physical presence and economic activity. Even if you don't have an office or a single employee in the US, your sales volume alone can trigger these obligations.
Physical Nexus: More Than Just an Office
Physical nexus is the traditional way of establishing a tax connection. It isn't just about having a brick-and-mortar store. For most international e-commerce sellers, physical nexus is triggered by inventory.
If you use services like Amazon FBA or third-party logistics (3PL) providers, storing your goods in a warehouse creates physical nexus in that state. Other triggers include:
- Employees or Contractors: Having staff, even remote ones, working in a state.
- Trade Shows: Attending or selling at events for a certain number of days (the limit varies by state).
- Affiliates: Having partners in a state who send traffic to your site in exchange for a commission.
Economic Nexus: The 2026 Landscape
Economic nexus is based entirely on your sales revenue or transaction volume. Since the landmark South Dakota v. Wayfair ruling, almost every state with a sales tax has implemented these rules.
By 2026, we have seen a significant trend: states are moving away from "transaction counts" and focusing purely on "revenue thresholds." This is great news for small businesses that sell high volumes of low-cost items, as it simplifies the path to compliance.
Understanding the $100,000 Standard
For the majority of US states, the magic number is $100,000 in gross sales over a 12-month period. Once you cross this threshold, you have triggered economic nexus.
However, several "powerhouse" states maintain higher thresholds to encourage commerce:
- California: $500,000 in annual sales.
- Texas: $500,000 in annual sales.
- New York: $500,000 in sales AND 100 transactions (one of the few still using a dual requirement).
- Florida: $100,000 in sales.
It is essential to monitor your sales daily. Crossing a threshold in April means you may need to be registered and collecting tax by May. To understand why staying on top of these changes is vital, read more about why the latest IRS updates will change the way you sell in the USA.
The 2026 Trend: Eliminating Transaction Counts
One of the most important updates for 2026 is the repeal of transaction-based thresholds in several states. Previously, many states required you to register if you had 200 transactions, even if your total sales were only $2,000.
States like Utah and Illinois have recently removed these transaction counts, shifting to a revenue-only model. This reduces the "compliance drag" for international sellers, but it still requires diligent record-keeping. You must know exactly which sales count toward which state’s threshold. Don't worry: this is where a Global Tax Compliance Suite becomes your best asset. We handle the heavy lifting of categorizing and calculating these figures for you.
Marketplace Facilitator Laws: Who Collects the Tax?
If you sell on platforms like Amazon, eBay, or Walmart, you might think you’re off the hook. While these platforms (known as Marketplace Facilitators) are required to collect and remit sales tax on your behalf in most states, your responsibilities don't vanish.
Even if the marketplace collects the tax, you may still be required to:
- Register for a permit: Some states require registration if you have physical nexus (inventory) regardless of who collects the tax.
- File "Zero" Returns: You must report your gross sales to the state, even if the tax collected was $0 because the marketplace handled it.
- Monitor Non-Marketplace Sales: If you sell through your own Shopify store alongside Amazon, you must combine those sales to see if you’ve hit a nexus threshold.
1099-K Threshold Alert: The IRS Has Confirmed the 2026 Threshold
There is another important 2026 reporting update if you sell through marketplaces or payment platforms. The IRS has confirmed that for 2026 filings, the Form 1099-K reporting threshold remains at more than $20,000 in gross payments and more than 200 transactions.
This is still a major relief for smaller marketplace sellers. It means many low-volume or part-time sellers are less likely to receive a Form 1099-K purely because of a lower reporting trigger.
Still, do not confuse a reporting threshold with a tax exemption. You must report all taxable business income whether or not you receive a Form 1099-K from Amazon, eBay, Etsy, PayPal, Stripe, or another payment platform. Keep clean records for gross sales, fees, refunds, and expenses. Doing this will help you avoid mismatches and stay ready if the IRS asks questions later.
IRS Schedule 1-A Deductions: New Breaks You Need to Track
There is also a separate federal income tax update tied to the One, Big, Beautiful Bill. The IRS has introduced Schedule 1-A for additional deductions that can reduce taxable income even if you take the standard deduction.
The new Schedule 1-A deductions include:
- Qualified tips: The new rules allow eligible taxpayers to deduct qualified tip income.
- Qualified overtime: Eligible overtime pay can now qualify for a separate deduction.
- Qualified car loan interest: Eligible taxpayers may deduct qualifying passenger vehicle loan interest, subject to IRS rules and limits.
These changes are important if you run payroll, receive tipped income, work overtime, or finance a business-related or personal-use vehicle that falls within the IRS rules. It is essential to keep accurate wage records, payroll reports, and vehicle loan documents. Doing this will make filing easier and reduce the risk of claiming the wrong amount.
You should also note that the broader IRS update mentions Trump Accounts for children. These are child-focused IRA-style accounts created under the same legislation, with specific funding and eligibility rules set out by the IRS. If you are planning family tax and savings structures for 2026 and beyond, this is worth monitoring closely.
Failing to report these sales correctly is a common pitfall. To avoid these traps, check out our guide on 7 mistakes you’re making with USA tax compliance.
Your 2026 US Sales Tax Checklist
Managing nexus doesn't have to be a headache. Follow this structured approach to maintain compliance and focus on growing your brand.
1. Identify Where Your Inventory Is
Audit your 3PL and Amazon FBA reports. Note every state where your products are stored. This is your baseline for physical nexus.
2. Track Sales by State Monthly
Don't wait until the end of the year. Use a dashboard to track your rolling 12-month sales for each state. Pay close attention as you approach the $100,000 mark in mid-sized states or the $500,000 mark in CA and TX.
3. Register Before You Start Collecting
It is illegal to collect sales tax from a customer without a valid state permit. Once you hit a threshold, apply for your permit immediately. Most states allow you to do this online.
4. Update Your Sales Channels
Once you have your permit, update your tax settings in Shopify, Amazon, or your ERP. Ensure you are charging the correct rate based on the customer's "ship-to" address.
5. File on Time, Every Time
States assign filing frequencies (monthly, quarterly, or annually) based on your sales volume. Missing a deadline results in immediate penalties. This is why daily IRS and state updates are your new secret weapon.
Why International Sellers Choose Sterlinx Global
At Sterlinx Global, we don't just give advice: we execute your compliance. We understand that as an international business owner, your time is best spent on product development and marketing, not deciphering the tax codes of 50 different states.
Our operating model is simple: you provide the data, and we complete the compliance. We handle the registration, calculation, and filing across the US, UK, Canada, and beyond. Whether you are a fast-growing SME or a digital agency, we ensure your global footprint remains tax-compliant every single day.
If you’re worried about whether you’ve crossed a threshold or if your current filings are accurate, we are here to help. Our team specializes in cross-border compliance for international entities, including USA LLCs and UK Limited Companies selling into the States.
Frequently Asked Questions
Do I need a US bank account to pay sales tax?
While it makes things easier, many states now accept international wire transfers or work with specialized payment providers. We can guide you on the best way to remit your collected taxes.
What happens if I ignored nexus rules in the past?
Ignoring nexus can lead to "successor liability" and massive back-tax bills plus interest. Many states offer Voluntary Disclosure Agreements (VDA), allowing you to come forward and settle past debts with reduced penalties.
Are there states with no sales tax?
Yes. Delaware, Montana, New Hampshire, and Oregon do not have a state-level sales tax. Selling to customers in these states does not trigger a sales tax collection requirement.
Does economic nexus apply to digital services and SaaS?
In 2026, many states have expanded their nexus rules to include digital products and SaaS. If you are a digital business, it is vital to check state-specific definitions of "taxable services."
How often do nexus thresholds change?
While the trend in 2026 is toward stability, states can change their thresholds or measurement periods at any time through legislative sessions. Monitoring these changes is a core part of our service.
Take the Next Step Toward Compliance
The complexity of US sales tax nexus should not be a barrier to your global expansion. With the right systems in place, you can sell with confidence across every state border. Don't let a surprise audit derail your 2026 growth plans.
Ready to automate your US sales tax filings? Contact us today to speak with an expert and ensure your business is fully compliant.