US Sales Tax Economic Nexus Check

io.github.Nero-EnginePublished by GitHub account Nero-Enginev1.0.0Updated Oct 24, 2026

Which US states must a remote seller register in for sales tax? Every state's nexus rule. Sourced.

The publisher's own server: check.tattoo: tattoo size and placement guide

VerifiedStreamable HTTPWeb executableFinanceBusiness & Commerce

Overview

AI-generated overview

Checks which US states a remote seller must register in for sales tax, based on sales by state, and lists state nexus thresholds and upcoming changes.

What you can do
The server evaluates economic nexus for remote sellers: given dollar sales and transaction counts per state for a period, it reports which states require registration to collect sales tax. It also lists each state's economic nexus thresholds, including dollar and transaction tests, measurement period, marketplace rules and official source, and lists upcoming or recent threshold changes in a date window. A free capabilities tool shows coverage, the date the data was last checked, and related servers.
When to use it
Useful for online sellers, accountants or finance teams that need a quick read on US sales tax registration obligations across states, or want to track threshold changes such as states dropping transaction tests.
Requirements
Remote streamable HTTP endpoint; no authentication, environment variables or headers are declared. Network access to the endpoint is needed.
Before you install
Sales figures submitted for the nexus check are sent to a third-party remote service, so consider whether that data is sensitive. Results are informational and should be verified against official state sources before registering or collecting tax.

Installation

In SourceWeft

  1. Open US Sales Tax Economic Nexus Check in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.Nero-Engine%2Fus-sales-tax-nexus/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "us-sales-tax-economic-nexus-check": {
      "type": "http",
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    }
  }
}

Tools

4

list_capabilities

Lists coverage (45 sales tax states plus DC, and the 5 states with no statewide sales tax), the date the data was last checked, and related Nero Labs Rules servers. Free.

Takes no parameters.

check_economic_nexus

Checks which US states a remote seller (no office, staff or stock in the state) must register in to collect sales tax, from its sales into each state. Give sales_by_state with the dollar sales and number of transactions (orders) per state, the period those figures cover, and whether they include sales made through marketplaces such as Amazon or Etsy. Returns states where the seller is over the economic nexus threshold (must register), states close to it (80 percent or more), states under it, and for each the threshold, the measurement period the state uses, what sales count (gross, retail or taxable only), whether marketplace sales count, when registration must happen, and the state revenue department source. Unclear cases give the SAFE answer (treated as over) with what it depends on. Free.

Parametersdateperiodsales_by_staterequiredshow_all_statesincludes_marketplace_sales

list_nexus_thresholds

Lists the economic nexus threshold of every US sales tax state (or one state) on a date: dollar and transaction thresholds, and/or logic, measurement period, what counts, marketplace rules, when to register and the official source. Also lists the states with no statewide sales tax. Free.

Parametersdatestate

list_upcoming_nexus_changes

Lists economic nexus threshold changes in a date window (for example states dropping the 200 transaction test), soonest first, with the old and new rule and source. Use a past from_date to see recent changes. Free.

Parametersdaysfrom_date

Version history

1
  1. v1.0.0LatestOct 10, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.

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