$500,000 vs. $100,000 Economic Nexus: Three States Set the Bar 5x Higher — and What That Means If You Sell $1M–$5M Annually

The Post-Wayfair Landscape: Why $100K Became the Default

The South Dakota v. Wayfair decision in June 2018 gave states the green light to impose sales tax collection obligations on remote sellers with no physical presence. South Dakota's own law used a $100,000 revenue or 200-transaction threshold, and the Supreme Court cited these figures approvingly. Within 18 months, over 40 states adopted substantially similar thresholds. The $100K/200-transaction combination became the de facto national standard.

But three states went in a different direction. Texas, California, and Tennessee each set their economic nexus threshold at $500,000 in gross revenue — and none of them includes a transaction-count prong. This was not an oversight. Each state had specific reasons for the higher floor, and understanding those reasons helps explain why the $500K threshold is likely to stay.

The Three $500K States: Side-by-Side Comparison

The structural similarity is clear: all three states chose the same dollar figure, all three declined to include a transaction-count trigger, and all three exclude marketplace-facilitated sales. The differences are in measurement periods and registration timelines.

Why These Three States Chose $500K Instead of $100K

The $500K threshold was not arbitrary. Each state had specific economic and legislative factors:

Texas is the second-largest state economy and already collected substantial sales tax revenue through physical nexus. The Texas Comptroller set the $500K threshold through administrative rule (Rule 3.286) rather than legislation, giving the Comptroller flexibility to lower it later. Texas also has one of the most complex local tax structures in the country — over 1,500 local jurisdictions — and the higher threshold limits the number of small remote sellers forced to navigate that complexity.

California enacted its $500K threshold through AB 147, effective April 1, 2019. As the largest state economy, California's reasoning was similar: a lower threshold would sweep in thousands of small sellers while adding marginal revenue. California also has significant local district taxes layered on top of the 7.25% base rate, with combined rates exceeding 10% in some jurisdictions. The $500K floor keeps compliance obligations focused on sellers with meaningful California revenue.

Tennessee was the last of the three to implement economic nexus, with an effective date of October 1, 2020. Tennessee's $500,000 sales-only threshold was set through legislation (Public Chapter 370) and reflects the state's broader approach of shielding smaller out-of-state sellers. Like Texas and California, Tennessee has a multi-layered local tax system that adds compliance burden.

No Transaction-Count Escape Hatch: What That Actually Means

In the 45+ states using the $100K/200-transaction standard, transaction count serves as a catch-all for high-volume, low-value sellers. A seller processing 250 orders at $50 each ($12,500 total revenue) triggers nexus in those states through the 200-transaction prong alone, despite revenue well below $100K.

Texas, California, and Tennessee eliminated this entirely. Revenue is the only measure. This has two practical consequences:

• High-volume, low-AOV sellers get a pass. A seller of $10 accessories with 5,000 Texas orders ($50,000 total) has no Texas economic nexus. In a $100K/200-transaction state, they would have triggered nexus at their 200th order.
• Monitoring is simpler. You only need to track one number per state — trailing revenue — instead of two. For businesses selling in dozens of states, eliminating the transaction-count variable for three of them reduces monitoring overhead.

For SaaS and subscription businesses, the absence of a transaction-count threshold in these three states is particularly significant. Monthly subscription renewals rack up transaction counts quickly — 50 Texas subscribers paying monthly generate 600 transactions per year. In a transaction-count state, that alone would trigger nexus. In Texas, only the dollar value matters.

Marketplace Facilitator Rules: Do Platform Sales Count Toward $500K?

In all three $500K states, marketplace-facilitated sales are excluded from your individual threshold calculation. Amazon, Walmart Marketplace, Etsy, and other qualifying platforms collect and remit sales tax on orders they facilitate. Those sales do not count toward your $500,000.

This exclusion is the same mechanism that applies in $100K states for multi-channel sellers, but the higher threshold makes it even more impactful. Consider this scenario:

This same seller in a $100K state would have direct-channel nexus at $100,000 — crossed months earlier. The $500K threshold plus the marketplace exclusion creates a substantial buffer for sellers whose revenue is heavily platform-dependent.

Important: Shopify, WooCommerce, BigCommerce, and similar commerce platforms are not marketplace facilitators. All sales through your own storefront on these platforms count as direct sales toward the $500K threshold.

Registration-Priority Matrix for $250K–$5M Sellers

The $500K threshold creates a natural sequencing opportunity. Instead of registering in every state simultaneously, businesses earning $1M–$5M nationally can prioritize based on where they actually have nexus:

The sweet spot for the $500K advantage is between $1M and $3M in total annual revenue. At this level, your per-state distribution is usually spread across enough states that no single $500K state receives more than $300K–$400K in direct-channel sales. You are fully compliant in the $100K states where you have nexus while legally deferring registration in the $500K states until you actually breach the threshold.

This is not tax avoidance — it is threshold-based compliance sequencing. You register where the law requires it and defer where it does not.

Worked Example: Canadian E-Commerce Seller Approaching Texas and California

Cross-border sellers face the same thresholds as domestic ones. A Canadian business shipping goods to US customers has no special exemption — the Canada–US tax treaty does not apply to state-level sales tax obligations.

The critical point for cross-border sellers: the Canada–US tax treaty governs federal income tax, not state sales tax. Every state's economic nexus law applies to remote sellers regardless of country of origin. A Canadian business has the same $500K threshold as a Delaware-based competitor — no higher, no lower.

How Measurement Periods Differ Across the Three States

While all three states use $500,000 as the threshold, they measure differently:

• Texas (trailing 12 calendar months): A continuously rolling window. On any given day, you sum your Texas sales for the preceding 12 months. If the total exceeds $500K, nexus attaches. Apply for a sales tax permit within that same calendar month.
• California (preceding or current calendar year): California uses a calendar-year test. If you exceeded $500K in the prior calendar year, you have nexus for the current year. If you exceed $500K during the current calendar year, nexus attaches immediately. This means a seller who crossed $500K on December 15 of last year has nexus for all of this year — even if January sales are zero.
• Tennessee (trailing 12 months, quarterly snapshots): Tennessee evaluates the previous 12 months ending on the last day of each completed quarter. This means nexus is assessed four times per year: after March 31, June 30, September 30, and December 31. You begin collecting on the first day of the third month after the quarter in which the threshold was exceeded.

These differences matter at the margins. A seller who hits $500K in Texas on October 15 must act immediately. The same seller hitting $500K in Tennessee on October 15 will be evaluated at the December 31 quarter-end, with collection starting March 1. That is a four-and-a-half-month difference in when the obligation kicks in.

Retroactive Exposure: What If You Should Have Registered Already?

If you have been selling above $500K in direct-channel revenue in Texas, California, or Tennessee without collecting sales tax, you may have retroactive exposure. The uncollected tax is still owed — by you, not your customers. Interest and penalties accrue from the date nexus was established.

All three states participate in voluntary disclosure agreements (VDAs) through the Multistate Tax Commission or their own state programs. A VDA typically limits the lookback period to three to four years, waives penalties, and may reduce interest. If you suspect retroactive exposure, a VDA is almost always the better path compared to waiting for an audit notice.

The Local Tax Complexity Factor

One underappreciated reason the $500K threshold matters: all three states have complex local tax structures. Texas has over 1,500 local taxing jurisdictions. California has district taxes that can push combined rates above 10%. Tennessee's local rates vary by county and city.

Once you register and begin collecting, you must collect the correct combined rate for each customer's delivery address. This is not like Connecticut's flat 6.35% statewide rate. Each order requires an address-level rate lookup, and you file returns that break out state and local tax separately. The compliance burden is meaningful — which is precisely why the $500K threshold provides such a valuable planning window. You can defer this complexity until your state-specific revenue justifies the investment in tax automation software or a compliance service.

New York: The $500K State That Is Not Like the Others

New York uses a $500,000 revenue figure, but it is structurally different from Texas, California, and Tennessee. New York requires $500,000 in gross revenue AND more than 100 transactions in the preceding four sales tax quarters. This is a conjunctive AND standard — both conditions must be met. A seller with $600,000 in New York revenue but only 90 transactions has no economic nexus.

This is the same AND structure that Connecticut uses at $100K/200 transactions. The AND rule makes New York significantly more permissive than the three revenue-only $500K states for high-value, low-transaction-count sellers (e.g., B2B wholesalers shipping large orders).

For most e-commerce sellers, however, the 100-transaction count is easily met. If you sell consumer products and have more than 100 New York customers per year, the practical threshold is just the $500K revenue figure — functionally similar to TX, CA, and TN, but legally distinct.

2026 Transaction Count Rules: State-by-State Comparison

As of 2026, the high-threshold states break into two distinct patterns that directly affect when you must register:

The New York AND rule is the key differentiator for 2026 planning. A B2B wholesaler shipping 50 large orders totaling $800K to New York has no economic nexus — the transaction prong is not met. The same seller would have nexus in Texas, California, and Tennessee from the first dollar over $500K. For DTC e-commerce sellers processing hundreds or thousands of orders, the transaction count is a non-issue and all four states effectively function identically at the $500K revenue line.

Practical Compliance Sequencing for Growing Businesses

If your business is growing and you are working through multi-state registration for the first time, here is a practical sequence:

1. Register in states where you have physical nexus first. Employees, inventory, or office space create nexus regardless of revenue. No threshold analysis needed.
2. Register in $100K states where you clearly exceed the threshold. Pull your trailing 12-month revenue by state. Any state over $100K (or 200 transactions) needs immediate registration.
3. Evaluate Texas, California, and Tennessee individually. Pull your direct-channel revenue (exclude marketplace sales) for each state. If you are below $500K, document the analysis and set a quarterly reminder to re-check.
4. Monitor the $500K states quarterly. As your business grows, you will eventually cross $500K in one or more of these states. The registration deadlines are tight (especially Texas — same calendar month), so do not wait until you have already exceeded the threshold to begin the registration paperwork.

This approach minimizes compliance overhead while ensuring you are never non-compliant. You register where the law requires it and defer where it does not — with a monitoring cadence that catches threshold crossings before they create retroactive exposure.