Sales Tax Nexus

Organization

openaccountant

sales-tax-nexus

Determine sales tax obligations by state based on economic nexus thresholds.

Overview

Publisher	openaccountant
Repository	`skills`
Skill name	`sales-tax-nexus`
Stars	106
Forks	18
Bundled files	Instructions only
License	MIT
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by openaccountant on GitHub. Read the source before you install it.

Installation

Install the Sales Tax Nexus AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/openaccountant/skills/tree/main/shared/sales-tax-nexus
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/openaccountant/skills.git /tmp/skills
mkdir -p .claude/skills
cp -r /tmp/skills/shared/sales-tax-nexus .claude/skills/sales-tax-nexus

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Sales Tax Nexus in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Sales Tax Nexus on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Sales Tax Nexus is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Sales Tax Nexus Analysis

Overview

Analyzes your revenue and transaction volume by state to determine where you have economic nexus and are required to collect and remit sales tax. After the 2018 Supreme Court decision in South Dakota v. Wayfair, most states impose sales tax obligations on remote sellers exceeding certain thresholds.

Wilson Tools Used

transaction_search — Find revenue transactions and identify customer locations by state
spending_summary — Summarize total revenue by state for threshold comparison
export_transactions — Export state-by-state revenue data for filing or advisor review

Workflow

Use transaction_search to pull all revenue (income) transactions for the current or prior calendar year.
Group revenue by customer state (based on transaction descriptions, merchant data, or notes).
Use spending_summary to total revenue and count transactions per state.
Compare each state's totals against that state's economic nexus thresholds.
Flag any state where you exceed the threshold -- you likely have a collection obligation.
Use export_transactions to generate a report for your tax advisor or sales tax software.

Common Economic Nexus Thresholds

Most states use one or both of these triggers (exceed either to create nexus):

Threshold Type	Most Common Level	Notes
Revenue	$100,000 in sales	Some states use $500K (CA, NY, TX)
Transactions	200 transactions	Not all states use a transaction count

States with no sales tax: AK (no state tax, but local taxes exist), DE, MT, NH, OR.

Notable exceptions to the $100K / 200 threshold:

California: $500,000 revenue only (no transaction count)
New York: $500,000 revenue AND 100 transactions (must meet both)
Texas: $500,000 revenue only

Key Dates

Nexus is typically measured on a rolling 12-month or prior calendar year basis.
Once nexus is established, you must register, collect, and remit until you fall below the threshold for a specified period (varies by state).

Without Wilson

Export all revenue transactions from your payment processor (Stripe, PayPal, Shopify, etc.).
Add a "Customer State" column based on shipping address or billing address.
Create a pivot table: State vs. Sum of Revenue and Count of Transactions.
Download the current nexus threshold table from your state's Department of Revenue or a resource like the Sales Tax Institute.
Compare each state's revenue and transaction count to the threshold.
For any state where you exceed the threshold, register for a sales tax permit and begin collecting.
Consider using automated sales tax software (e.g., TaxJar, Avalara) if you have nexus in multiple states.

Important Notes

Physical presence (office, warehouse, employee, inventory) still creates nexus regardless of revenue thresholds.
SaaS and digital goods have different taxability rules by state. Some states tax them, others do not.
Marketplace facilitators (Amazon, Etsy, eBay) typically collect and remit sales tax on your behalf for sales through their platforms. Those sales may still count toward your nexus threshold in some states.
Filing frequency (monthly, quarterly, annually) depends on the state and your volume.
Penalties for not collecting sales tax can include back taxes, interest, and fines. Some states offer voluntary disclosure agreements (VDAs) to limit lookback periods.
This is not tax advice. Consult a CPA or tax professional for filing decisions.

Frequently asked questions

What does the Sales Tax Nexus AI skill do?

Determine sales tax obligations by state based on economic nexus thresholds.

Why use Sales Tax Nexus on TypingMind?

Because you install it once and use it with any model. Sales Tax Nexus is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Sales Tax Nexus in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/openaccountant/skills/tree/main/shared/sales-tax-nexus. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Sales Tax Nexus?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Sales Tax Nexus?

As many as you like. As long as a model supports skills, you can use Sales Tax Nexus with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Sales Tax Nexus AI skill free?

Yes. It is published on GitHub by openaccountant under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Sales Tax Nexus Analysis

Overview

Wilson Tools Used

Workflow

Common Economic Nexus Thresholds

Key Dates

Without Wilson

Important Notes

Frequently asked questions

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