Revenue Distribution
Select how your revenue is distributed. For exact analysis, consult your sales data by state. This calculator uses a simplified distribution model to identify potential nexus obligations.
Nexus Analysis
Enter your revenue data and click check.
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Introduction
The 2018 Supreme Court ruling in South Dakota v. Wayfair fundamentally changed the rules for online sellers. Before Wayfair, you only owed sales tax where you had a physical presence. After it, more than 45 states enacted economic nexus laws — meaning once your sales in a state cross a threshold (typically $100,000 in revenue or 200 transactions per year), you are required to collect and remit that state's sales tax, even if you have never set foot there. The penalties for non-compliance are severe: back taxes, interest, and penalties that can equal 25% to 50% of the original tax owed. For an e-commerce seller generating $800,000 in annual revenue across 15 states, unmanaged nexus exposure is a six-figure liability risk. This sales tax nexus calculator helps you identify which states you have triggered or are approaching nexus in, based on your transaction volume and revenue by state.
What This Calculator Does
This sales tax nexus calculator evaluates your economic nexus status across U.S. states based on annual sales revenue and transaction count by state. Enter your sales amount and transaction count for each state where you have customers. The calculator flags states where you have already crossed the economic nexus threshold, states where you are within 20% of the threshold (approaching nexus), and states where you have no current obligation. It also supports physical nexus inputs (warehouses, employees, inventory) to identify traditional nexus obligations. Use it during tax planning, before expanding to new sales channels, or after receiving a state audit notice.
The Formula
Most states use a bright-line test: either $100,000 in annual gross sales into the state OR 200 or more separate transactions. A few states (Kansas, Pennsylvania) use revenue-only tests with no transaction threshold. Louisiana uses $100,000 revenue OR 200 transactions with a July 1 annual reset. Alaska has no state sales tax but some municipalities have enacted local taxes with their own thresholds. Approaching nexus is defined as 80% of the applicable threshold — the point at which proactive registration becomes advisable to avoid a mid-year compliance scramble.
Step-by-Step Example
Compile your state-by-state sales data
Pull your sales report from your e-commerce platform (Shopify, WooCommerce, Amazon Seller Central) filtered by ship-to state for the previous 12 months. You need two numbers per state: gross revenue and number of separate transactions. Amazon reports this in the Business Reports section under Sales and Traffic by State.
Identify your physical nexus states first
Physical nexus exists in any state where you have employees, an office, a warehouse, a fulfillment center, or inventory stored by a third party including Amazon FBA. If Amazon stores inventory in a California warehouse, you have physical nexus in California regardless of your economic activity there. List every state with physical presence first — these are automatic nexus triggers.
Apply economic nexus thresholds to remaining states
For a seller with $140,000 in Texas revenue and 320 transactions: Texas threshold is $500,000 revenue-only (no transaction count). You are well below threshold. For Florida: threshold is $100,000 or 200 transactions. At $140,000 revenue, Florida nexus is triggered. The transaction count test makes many small-order sellers trigger nexus faster than revenue alone would.
Flag approaching thresholds and set monitoring alerts
If you have $83,000 in Ohio revenue year-to-date in July, you are on pace to cross $100,000 by October. Register proactively — Ohio requires registration before the first taxable sale after crossing the threshold, and late registration carries interest on all uncollected tax from the crossing date, not from when you registered.
Real-World Use Cases
Multi-Channel E-Commerce Seller Post-Wayfair Audit
A seller generating $1.2M annually across Shopify and Amazon in all 50 states uses the calculator to discover nexus triggered in 18 states based on revenue alone, plus 6 additional states based on the 200-transaction test. She had been collecting tax in only 4 states. The nexus audit triggers a voluntary disclosure process in 14 states, avoiding $38,000 in back-tax exposure.
New Product Launch State Selection
A SaaS company planning to market a software subscription nationally models projected Year 1 revenue by state. The calculator shows they will cross nexus in California (threshold: $500,000), New York ($500,000), and Texas ($500,000) in Year 1 but remain below threshold in most other states. They register in three states pre-launch rather than scrambling mid-year.
Marketplace Facilitator Analysis
A seller on Etsy and eBay wonders if marketplace facilitator laws eliminate their nexus obligations. In 46 states, marketplace facilitators like Amazon, Etsy, and eBay now collect and remit sales tax on behalf of third-party sellers. However, if the seller also sells direct-to-consumer via their own website, the direct channel revenue counts separately toward nexus thresholds.
Comparison
| State | Revenue Threshold | Transaction Threshold | Notable Rule |
|---|---|---|---|
| California | $500,000 | None | Revenue only |
| New York | $500,000 | 100 transactions | Both tests |
| Texas | $500,000 | None | Revenue only |
| Florida | $100,000 | 200 transactions | Standard Wayfair |
| Kansas | $1 (no threshold) | None | All remote sellers |
Common Mistakes to Avoid
Counting marketplace sales and direct sales together without checking marketplace facilitator exemptions. If you sell exclusively on Amazon in a state, Amazon may be collecting the tax as the marketplace facilitator — and that revenue may not count toward your economic nexus threshold in states that exclude facilitated sales. Confirm each state's treatment of marketplace sales before calculating your nexus exposure.
Using the wrong measurement period. Most states calculate economic nexus based on the prior calendar year or prior 12 rolling months. Some states (Louisiana, South Dakota) use a specific annual calendar period. If you crossed the threshold in 2024 based on the prior-year lookback, you owe registration even if your current 12-month sales are below threshold.
Ignoring transaction count thresholds in favor of revenue alone. A seller with $90,000 in Indiana revenue and 215 transactions has triggered Indiana nexus via the transaction count test even though revenue is below $100,000. Low-price-point sellers with high order volume frequently trigger nexus through transactions before they approach revenue thresholds.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides nexus assessment guidance based on general threshold rules. Sales tax law is complex, varies significantly by state, and changes frequently following legislative updates. This tool does not constitute tax or legal advice. Consult a qualified sales tax professional or CPA before making compliance decisions, especially if you have received a state audit notice or if significant back-tax liability may be involved.
Conclusion
Economic nexus tracking is not a one-time exercise. Thresholds reset annually on January 1 in most states — a seller who crossed California's threshold in November may find they are approaching it again by September of the following year. Once you have identified your nexus states, use the Sales Tax Reverse Calculator to confirm the correct tax-inclusive price on your product pages. For the full self-employment tax picture including state obligations, the Self-Employment Tax Calculator shows how state tax liabilities interact with your federal SE tax burden.
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