Sales Tax Nexus 2026: State Thresholds, SaaS Rules & Compliance Guide for Multi-State Sellers
What Is Economic Nexus and Why It Matters in 2026
If your business sells products or services to customers in multiple US states, you may have a sales tax obligation in states where you have no physical presence. This concept — called economic nexus — was established by the 2018 Supreme Court decision in South Dakota v. Wayfair, Inc.
In plain terms: if you sell enough into a state, you must register, collect, and remit sales tax there — even if you’ve never set foot in that state, have no warehouse, and no employees there.
Since Wayfair, all 45 states with a sales tax (plus Washington D.C.) have enacted economic nexus laws. The thresholds and rules vary, and they keep changing. In 2026, several states updated their rules again.
State-by-State Economic Nexus Thresholds (2026)
Most states have converged on a $100,000 revenue threshold as the standard trigger. However, there are notable exceptions:
| State | Revenue Threshold | Transaction Threshold | Notes |
|---|---|---|---|
| California | $500,000 | None | Highest threshold in the US |
| Texas | $500,000 | None | Changed from $100K in 2025 |
| New York | $500,000 | 100 transactions | Dual threshold (either triggers nexus) |
| Most other states | $100,000 | None | Revenue-only since 2025-2026 |
| South Dakota | $100,000 | None | The state that started it all (Wayfair) |
| Florida | $100,000 | None | Added economic nexus in 2021 |
| Alaska | $100,000 | None | Dropped 200-transaction count in 2025 |
Key 2026 Updates
- Utah, Alaska, Illinois: eliminated the 200-transaction threshold, leaving revenue as the sole trigger
- Maine: added digital audio and streaming services to taxable categories
- California: still the outlier at $500,000 — if you don’t meet this, you don’t have CA nexus (even with thousands of transactions)
SaaS and Digital Services: Increasingly Taxable
If you sell software, digital subscriptions, or online services, 2026 brings more complexity. The trend is clear: more states are taxing SaaS.
| State | SaaS Taxable? | Digital Products? | Notes |
|---|---|---|---|
| Texas | Yes | Yes | Broadly taxable since 2020 |
| New York | Yes | Yes | Includes cloud computing |
| Pennsylvania | Yes | Yes | Including digital books |
| Washington | Yes | Yes | B&O tax applies too |
| California | No | Mostly no | Exception for digital goods |
| Florida | No | No | But marketplace facilitator rules apply |
| Illinois | Varies | Yes for some | Chicago has its own rules |
If you sell SaaS nationally, assume you need to track nexus in at least 30+ states. The safe approach: monitor all states and register as thresholds are crossed.
What Happens If You Don’t Comply
Non-compliance isn’t just about penalties — it’s about accumulated liability. States can audit and assess back taxes for 3-7 years, plus interest and penalties.
| Consequence | Typical Range | Example |
|---|---|---|
| Back taxes owed | Full amount of uncollected tax | $50K+ for a mid-size e-commerce business |
| Interest | 6-12% annually (varies by state) | Compounds from the date tax was due |
| Penalties | 5-25% of unpaid tax | California: 10% penalty + interest |
| Audit assessment period | 3-7 years lookback | New York audits up to 6 years back |
| Criminal penalties | Rare but possible | Willful evasion can be a felony |
A Real Scenario
A SaaS company based in Delaware sells to customers in 38 states. They ignore nexus because they have no physical presence anywhere. After 3 years, California initiates an audit (they crossed $500K in CA sales in year 2). The assessment: $180,000 in back taxes + $27,000 interest + $18,000 penalties — for just one state.
This is why proactive nexus monitoring matters.
The Compliance Checklist: What You Need to Do
- Track your sales by state — revenue, transaction count, and type of product/service
- Monitor thresholds — when you approach $100K (or $500K for CA/TX/NY), prepare to register
- Register in triggered states — apply for a sales tax permit in each state where you have nexus
- Collect the correct tax rate — state + county + city rates vary by jurisdiction (there are 13,000+ tax jurisdictions in the US)
- File returns on time — monthly, quarterly, or annually depending on the state and your volume
- Keep records — transaction-level detail for at least 4 years
Common Mistakes Small Businesses Make
1. Assuming “No Office = No Tax”
The Wayfair decision eliminated this safe harbor. Economic activity alone creates nexus.
2. Ignoring Marketplace Sales
If you sell on Amazon, Etsy, or Shopify, the marketplace may collect tax for you in some states — but not all. You still need to track your direct sales separately.
3. Using a Single Rate Everywhere
Sales tax rates aren’t just state-level. A customer in Los Angeles pays a different rate than one in San Francisco, even though both are in California. You need jurisdiction-level accuracy.
4. Forgetting About “Notice and Reporting” States
Some states have a middle ground: if you don’t register, you must send notices to customers and report purchases. This creates more work than just registering.
5. Waiting for an Audit to Act
Voluntary disclosure programs exist in most states and typically waive penalties. Once an audit starts, you lose this option.
How Odiverse Handles Multi-State Sales Tax
Automatic Nexus Monitoring
Odiverse tracks your sales by state in real time. When you approach the $100,000 threshold (or state-specific threshold), you get an alert — before you trigger an obligation, not after. You see a dashboard with each state’s progress toward the threshold.
13,000+ Tax Jurisdiction Rates
Once you have nexus, Odiverse applies the correct tax rate automatically. State, county, city, and special district rates — all calculated at the point of invoicing based on the customer’s address.
Filing-Ready Reports
Generate state-by-state sales tax reports in the format each state requires. Export to CSV or connect directly to state filing portals. No more spreadsheets.
SaaS Taxability Rules Built In
Odiverse knows which states tax SaaS, which tax digital products, and which don’t. You set your product type once; tax is applied correctly everywhere.
Frequently Asked Questions
Do I need to collect sales tax in every state I sell to?
Only in states where you have economic nexus (typically $100K+ in sales). If you sell $5,000 to customers in Maine, you don’t have Maine nexus.
What about states with no sales tax?
Five states have no sales tax: Alaska (but localities can tax), Delaware, Montana, New Hampshire, and Oregon. You never need to collect or remit in these states (with some Alaska exceptions).
Can I pass the cost of compliance to my customers?
Sales tax IS passed to the customer — it’s added on top of your price. The cost to you is the compliance itself: tracking, filing, and record-keeping.
How do I know when I’ve crossed a threshold?
Most thresholds are measured on a trailing 12-month basis or current calendar year. Odiverse monitors this automatically and alerts you before you cross.
What if I’ve been selling for years without collecting?
Most states offer voluntary disclosure agreements (VDAs) that limit the lookback period (usually 3-4 years) and waive penalties. This is almost always better than waiting for an audit.
Managing multi-state sales tax doesn’t have to be overwhelming. Start with Odiverse and automate compliance from day one — nexus monitoring, rate calculation, and filing-ready reports, all powered by AI.