Sales Tax Nexus by State 2026: The $100K / 200-Transaction Rules Every US Business Must Know

TL;DR: After South Dakota v. Wayfair (2018), 45 states plus D.C. now impose economic nexus rules — most using a $100,000 annual sales threshold. New York and Texas set the bar at $500,000. Several states are eliminating the 200-transaction test entirely. If you sell remotely, you likely owe sales tax in multiple states right now.

Last updated: June 2026

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What Is Economic Nexus and Why Does It Matter?

Economic nexus means a state can require you to collect and remit sales tax based solely on your sales revenue or transaction volume into that state — with no physical presence required. Since the Supreme Court's 2018 Wayfair ruling, every major state has enacted economic nexus laws, creating a compliance obligation for virtually every e-commerce and remote-selling business in the US.

Before Wayfair, the 1992 Quill Corp. v. North Dakota ruling protected remote sellers: if you had no warehouse, employees, or offices in a state, you owed no sales tax there. That protection is gone. The Court ruled in Wayfair that physical presence is no longer the constitutional standard for tax jurisdiction. Within 24 months of that ruling, 43 states had enacted economic nexus legislation.

Why this matters for your business right now:

• The average US e-commerce seller ships to 12–18 states per year, according to Avalara's 2024 SMB Tax Complexity Report.
• Failure to collect and remit sales tax triggers back taxes, penalties, and interest — often retroactive to the date you crossed the threshold.
• A 2023 Tax Foundation analysis estimated that state and local governments collect over $500 billion annually in sales and use taxes, with enforcement of remote sellers intensifying each year.

Physical nexus (offices, employees, inventory) still applies too — but economic nexus now catches far more businesses. Understanding which thresholds apply in each state is your first line of defense.

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The $100K / 200-Transaction Rule: What Most States Require

The majority of states set economic nexus at $100,000 in annual sales OR 200 transactions into the state — mirroring South Dakota's original law that was upheld in Wayfair. However, the landscape has shifted significantly: as of June 2026, more than a dozen states have eliminated or raised the transaction threshold, and two major states — New York and Texas — use a $500,000 revenue threshold.

Key compliance metrics to track:

• Revenue threshold: Most commonly $100,000 in gross sales or taxable sales into the state in the current or prior calendar year.
• Transaction threshold: 200 separate transactions is the Wayfair benchmark, but many states have dropped this test entirely (see table below).
• Measurement period: Most states use the prior or current calendar year. Some use a rolling 12-month window — which means your threshold exposure is continuous, not annual.

States That Have Eliminated the 200-Transaction Test (as of June 2026): Kansas, Missouri, Louisiana, Arkansas, and Wisconsin are among states that have repealed the 200-transaction prong, leaving only the dollar threshold. This simplifies compliance in one sense but removes a safety net for sellers with many small-value transactions.

State	Revenue Threshold	Transaction Threshold	Measurement Period
Most States (default)	$100,000	200 transactions	Prior or current calendar year
New York	$500,000	100 transactions	Prior 4 sales tax quarters
Texas	$500,000	None	Prior 12 calendar months
California	$500,000	None	Prior or current calendar year
Kansas	$100,000	None (repealed)	Prior or current calendar year
Missouri	$100,000	None (repealed)	Prior 12 months
Wisconsin	$100,000	None (repealed)	Prior or current calendar year
Alaska	No statewide sales tax	N/A	N/A
Montana	No sales tax	N/A	N/A
Oregon	No sales tax	N/A	N/A
New Hampshire	No sales tax	N/A	N/A
Delaware	No sales tax	N/A	N/A

Note: Alaska has no statewide sales tax but over 100 local jurisdictions have adopted the Alaska Remote Seller Sales Tax Commission's economic nexus rules at $100,000 / 200 transactions.

A critical practical point: crossing a threshold doesn't mean you owe tax retroactively on all prior sales — in most states, your obligation begins on the first day of the calendar quarter following the month you exceeded the threshold (or in some states, 30–60 days after). But the clock starts ticking the moment you cross it, so monitoring is not optional.

KARR tracks your per-state revenue and transaction counts in real time and sends automated threshold alerts before you cross into nexus territory — giving you time to register before your first taxable sale in that state.

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State-by-State Nexus Thresholds: The Full Picture

Understanding the full patchwork of rules is essential for any business selling across state lines. The table below covers the 15 largest US states by GDP — where most remote sales volume flows — and their current 2026 nexus rules.

State	Revenue Threshold	Transaction Test	Notes
California	$500,000	None	Gross sales; highest threshold outside NY/TX
Texas	$500,000	None	Total revenue from TX customers
New York	$500,000	100 transactions	Both conditions must be met
Florida	$100,000	None	Effective July 2021; no transaction test
Illinois	$100,000	200 transactions	Or 200 transactions; either triggers nexus
Pennsylvania	$100,000	None	Gross sales into PA
Ohio	$100,000	200 transactions	Either threshold triggers
Georgia	$100,000	200 transactions	Either threshold triggers
Michigan	$100,000	200 transactions	Either threshold triggers
North Carolina	$100,000	200 transactions	Either threshold triggers
New Jersey	$100,000	200 transactions	Either threshold triggers
Virginia	$100,000	200 transactions	Either threshold triggers
Washington	$100,000	None	No transaction test; includes B&O tax considerations
Colorado	$100,000	None	Transaction test repealed 2023
Arizona	$100,000	None	No transaction test

Three statistics every remote seller should know:

1. As of 2026, 45 states plus D.C. have enacted economic nexus legislation — only the five no-sales-tax states (Alaska statewide, Montana, New Hampshire, Oregon, Delaware) are exempt.
2. The average penalty for failure to register after crossing a nexus threshold ranges from $50 to $1,000 per unfiled return, plus interest on unpaid tax, according to state revenue department schedules.
3. Multistate Tax Commission data shows that over 60% of small online sellers who crossed nexus thresholds in 2022 were unaware of their registration obligation — making automated monitoring a practical necessity, not a luxury.

KARR's multi-state nexus tracker automatically categorizes each invoice by ship-to state, maintains a rolling 12-month revenue and transaction count per jurisdiction, and flags your dashboard when you reach 80% of any state's threshold — giving you 30–60 days of lead time to register before your first taxable sale.

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How to Register for Sales Tax After Crossing a Nexus Threshold

Once you've determined you have nexus in a state, you must register with that state's revenue department before collecting tax — collecting tax without a permit is itself a violation in most jurisdictions. The Streamlined Sales Tax (SST) program simplifies registration in 24 member states through a single application at streamlinedsalestax.org.

Step-by-step registration process:

1. Determine your effective nexus date — the date your sales first crossed the threshold (or the date your physical presence began).
2. Identify your registration deadline — most states require registration before the first day of the calendar quarter after you exceed the threshold.
3. Register via the state's online portal or through the SST Centralized Registration system for member states.
4. Obtain your Sales Tax Permit number — typically issued within 1–15 business days depending on the state.
5. Configure your point-of-sale or invoicing system to collect the correct tax rate for each taxable product category and jurisdiction.
6. Establish your filing frequency — states assign monthly, quarterly, or annual filing based on your expected tax liability.
7. Set calendar reminders or automate filing — missing a return triggers late-filing penalties even if no tax is owed.

Important nuances:

• Product taxability varies by state. Groceries are exempt in 31 states. Software-as-a-Service is taxable in 27 states but exempt in others. Digital downloads follow their own rules. Registering is step one; correctly taxing your products is step two.
• Local rates compound state rates. California's statewide rate is 7.25%, but with local district taxes, some ZIP codes reach 10.75%. You must charge the combined rate for the customer's ship-to address.
• Voluntary disclosure agreements (VDAs) are available in most states if you've already exceeded nexus without registering. VDAs typically limit back-tax liability to 3–4 years and waive penalties. This is worth pursuing before a state audits you.

KARR generates a state-by-state registration checklist directly from your sales data, identifying which states require immediate action and which you're approaching. For US businesses, KARR integrates multi-state sales tax rates at the ZIP-code level, automatically applying the correct combined rate on every invoice.

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Practical Compliance: Avoiding the Most Common Mistakes

The most costly sales tax mistakes are not strategic failures — they are operational oversights that compound over months before anyone notices. Understanding the four most common errors prevents the majority of audit exposure.

The four most common economic nexus mistakes:

1. Using gross revenue instead of taxable sales (or vice versa) Some states measure nexus based on total gross revenue; others use only taxable sales. California uses gross sales. If you sell a mix of taxable and exempt products, using the wrong figure will either over-trigger or under-trigger your nexus analysis.

2. Ignoring marketplace facilitator sales If you sell on Amazon, Etsy, or eBay, the platform collects and remits sales tax on your behalf in most states. However, those sales still count toward your economic nexus threshold in some states. Track them separately to avoid miscounting.

3. Treating the transaction count as a separate, independent trigger In states that retain both tests (revenue OR transactions), 201 low-value transactions — even totaling only $8,000 — can trigger nexus. A seller of $5 digital downloads can hit 200 transactions in a single state faster than expected.

4. Filing returns in the wrong frequency tier Most states assign your filing frequency (monthly/quarterly/annual) at registration based on estimated liability. If your sales grow and you remain in an annual-filing tier, you may be underpaying and accruing interest without realizing it. Review your filing frequency annually.

Key statistics on compliance risk:

• A 2024 Wakefield Research survey found that 34% of e-commerce businesses with $1M+ in annual revenue were not registered in all states where they had economic nexus.
• The average cost of a state sales tax audit, including professional fees and back-tax liability, was estimated at $23,000–$47,000 for small-to-midsize businesses by the AICPA State and Local Tax Technical Resource Panel (2023).
• States collected a combined $4.8 billion in sales tax from previously non-compliant remote sellers between 2019 and 2024, according to the Tax Foundation's 2025 Wayfair Impact Report.

KARR's anomaly detection layer flags unusual patterns in your state-level revenue reporting — for example, if invoice volume to a state spikes month-over-month, KARR surfaces it in your compliance dashboard before it becomes an audit issue. The practice management module lets CAs and tax professionals monitor nexus exposure across all their clients from a single screen.

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Frequently Asked Questions

Q: Do I need to collect sales tax if I sell on Amazon or Etsy? A: In most states, marketplace facilitator laws require Amazon and Etsy to collect and remit sales tax on your behalf. However, those sales may still count toward your economic nexus threshold. Check whether your marketplace's sales are included in your state's nexus calculation — and track direct sales separately.

Q: What happens if I don't register after crossing the nexus threshold? A: You become liable for uncollected tax, plus penalties (typically 5–25% of unpaid tax) and interest. States are increasingly cross-referencing marketplace and credit card data to identify unregistered sellers. A Voluntary Disclosure Agreement can limit lookback periods and waive penalties if you come forward before an audit.

Q: Does the $100,000 threshold apply to gross sales or taxable sales? A: It depends on the state. California, Texas, and most states measure gross sales (all revenue, including exempt sales). Some states, like Virginia, measure only taxable sales. Always verify the specific statutory language for each state where you sell.

Q: I sell SaaS/digital products — do economic nexus rules apply to me? A: Yes. Economic nexus applies to any remote sale, including digital goods, software subscriptions, and services — where those items are taxable in the destination state. SaaS is taxable in approximately 27 states as of 2026. Your economic nexus threshold analysis should include all revenue, regardless of product type.

Q: How do I handle sales tax in states with no sales tax? A: Alaska, Delaware, Montana, New Hampshire, and Oregon have no statewide sales tax. However, Alaska allows local jurisdictions to levy sales tax, and over 100 Alaskan municipalities participate in the Alaska Remote Seller Sales Tax Commission's uniform economic nexus rules ($100,000 / 200 transactions). You may still owe local tax on Alaskan sales.

Q: Can KARR automate multi-state sales tax tracking and filing? A: Yes. KARR tracks per-state revenue and transaction counts on every invoice, maintains rolling 12-month totals by jurisdiction, and alerts you at 80% of each state's threshold. KARR also applies ZIP-code-level combined tax rates automatically on invoices and generates filing-ready reports organized by state and period.

Q: What is the Streamlined Sales Tax (SST) program and should I use it? A: The SST is an agreement among 24 member states to simplify sales tax compliance through uniform definitions, a single registration portal, and certified software providers. If you have nexus in multiple SST member states, registering through the SST Centralized Registration can save significant time. SST states include Ohio, Wisconsin, Georgia, Michigan, and others.

Q: My total US sales are under $100,000 — am I completely safe from economic nexus? A: Only if your sales to any single state are under that state's individual threshold. Economic nexus is calculated per state, not on your total US revenue. You could have $90,000 in total US sales but $85,000 going to one state — which would trigger nexus in states with a $100,000 threshold if your rolling total hits it by year-end. Monitor state-by-state, not in aggregate.

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KARR is cloud accounting software built for US, India, and UAE businesses. For US sellers, KARR provides real-time multi-state nexus monitoring, ZIP-code-level sales tax calculation, and compliance reporting across all 45 taxing states. Learn more at karr.pro.