How to Use the Sales Tax Nexus Tracker Prompt to Know Where to Register Before It Becomes a Problem

Since the Supreme Court's 2018 decision in South Dakota v. Wayfair, states can require online sellers to collect sales tax once their sales into the state pass a threshold, even with no office or warehouse there. Each state sets its own rules: the dollar amount, whether a transaction count applies, the measurement period, and whether sales through marketplaces like Amazon count. Many small sellers either ignore this until a notice arrives or start charging tax before they are registered. The Sales Tax Economic Nexus Tracker for Online Sellers After Wayfair: State Threshold Table, Measurement Periods, Marketplace Facilitator Sales Treatment, Registration Order, Voluntary Disclosure Flags, and a Monthly Monitoring Routine prompt turns your sales data and your own research on state thresholds into a clear plan: where you have nexus, where to register first, and where you may have past exposure.

What the prompt produces

1. A threshold table built only from the state rules you research, with any missing state marked as not researched.
2. A nexus test for each state showing the sales counted, whether you are over, near, or under, and when you crossed.
3. Marketplace facilitator treatment, showing the test both with and without marketplace sales when the rule is unclear.
4. Physical presence nexus, including inventory stored in third party warehouses such as Amazon FBA.
5. A registration order that puts states you already crossed first.
6. Past exposure flags with a plain explanation of voluntary disclosure agreements.
7. Product taxability notes to verify state by state.
8. After registration steps, including filing frequency and a returns calendar.
9. A monthly monitoring routine that alerts you at 80 percent of any threshold.

How to fill the inputs

SalesByState should split direct site sales from marketplace sales for each state. This split matters because states treat marketplace sales differently when testing the threshold.

TransactionCounts adds order counts where you have them, since some states use a transaction test alongside the dollar test.

StateThresholds is your own research from each state revenue department, with the date you checked. The prompt will not fill in thresholds from memory, which keeps the plan honest and current.

PhysicalPresence lists offices, employees, home based operations, trade shows, and inventory locations. Marketplace inventory reports are a common surprise here.

ProductTaxability describes what you sell, so the prompt can flag items like clothing, food, or digital goods that some states tax differently.

Reading the example output

The example is an apparel seller with direct and Amazon sales in several states, a home office in Colorado, and FBA inventory in two other states.

• Two states are over the threshold once marketplace sales are counted, and one state is under because its rule excludes marketplace sales.
• Two states are near the line, so the monthly routine flags them for watching.
• Physical presence comes first. The home state and FBA inventory states are listed ahead of economic nexus states because no threshold applies.
• Past exposure is flagged, not decided. States crossed without collection are marked for a CPA to review for voluntary disclosure.
• A state not researched stays blank rather than being guessed.

Tips for better results

• Pull sales by ship to state, not billing state.
• Rerun the test monthly using the same export so results stay comparable.
• Save screenshots or links of each state's rule with the date you checked it.
• Keep marketplace and direct sales in separate columns at all times.
• Book a CPA review before you register in states with past exposure.

Mistakes to avoid

• Do not charge sales tax to customers in a state before your permit is issued.
• Do not assume marketplace sales never count. In many states they count toward the threshold even though the marketplace collects.
• Do not forget inventory in third party warehouses.
• Do not treat this worksheet as tax advice. It is a planning tool to bring to a professional.

Who it is for

Shopify and WooCommerce store owners, Amazon and Etsy sellers who also run their own site, bookkeepers supporting ecommerce clients, and finance leads at growing direct to consumer brands.

Related PromptDig links

Open the Sales Tax Economic Nexus Tracker for Online Sellers After Wayfair: State Threshold Table, Measurement Periods, Marketplace Facilitator Sales Treatment, Registration Order, Voluntary Disclosure Flags, and a Monthly Monitoring Routine prompt and paste your state sales to see where you stand. For more operations and finance prompts, Browse more prompts. If you handle compliance for online sellers and have a useful prompt, Share a prompt.