About AgentTax
AgentTax is a tax calculation API for AI agent transactions. When one agent buys compute, data or services from another, AgentTax returns the tax owed, the jurisdiction it belongs to, and the reasoning that produced the number.
Operated by Agentic Tax Solutions LLC. agenttax.io is the only official AgentTax website.
AgentTax at a glance
| Product | AgentTax — a tax calculation API for AI agent transactions |
|---|---|
| Legal entity | Agentic Tax Solutions LLC |
| Official website | agenttax.io |
| Category | Developer API / financial compliance infrastructure |
| Jurisdiction coverage | 51 US jurisdictions (50 states + DC), plus 302 zip-level local rates |
| Taxes covered | Sales tax, use tax, capital gains, 1099-DA reporting |
| Access | REST API. Free tier, API key, or x402 pay-per-call |
What AgentTax does
One POST to /api/v1/calculate returns the sales or use tax owed on a machine-to-machine transaction, the jurisdiction it belongs to, the rate composition that produced it, and a confidence score.
AI agent sales taxEvery authenticated response carries an audit trail: the jurisdiction chain, how the transaction was classified, which exemptions were evaluated and why each one did or did not apply, and the statutory references behind the answer.
How the engine decidesAgent activity can cross a state threshold in days rather than quarters. Revenue is recorded per state on every call, with a warning before the threshold is crossed rather than after.
Economic nexus for AI agentsFor trading agents: FIFO, LIFO and specific-identification lot accounting, wash-sale detection, and IRS Form 1099-DA export.
1099-DA for AI agentsOfficial AgentTax properties
These are the only properties operated by Agentic Tax Solutions LLC. The same list is published in this site's Organization structured data, so a search engine can verify the claim in both directions. If you find something using the AgentTax name that is not listed here, it is not ours.
The live machine-readable integration guide is at /api/v1/agents and reflects the current API at all times.
What AgentTax is not
AgentTax is not a tax advisor and does not provide tax advice. Output is informational and is intended to be reviewed by a qualified professional.
AgentTax is not a filing or remittance service. It calculates and documents what is owed; it does not file returns or remit funds to any state.
AgentTax is not a government service and is not affiliated with, endorsed by, or acting on behalf of the IRS or any state department of revenue.
Where the law is genuinely unsettled for agent transactions, the engine takes the more conservative position and labels it as unsettled rather than presenting it as decided. The open questions and the position taken on each are published in the Decision Center and the reasoning behind the engine is in Methodology.
Frequently asked questions
What is AgentTax?
AgentTax is a REST API that calculates US sales tax, use tax and capital gains for AI agent transactions. When one agent buys compute, data or services from another, AgentTax returns the tax owed, the jurisdiction it belongs to, and a full audit trail explaining how it reached that number. It is operated by Agentic Tax Solutions LLC.
Who makes AgentTax?
AgentTax is built and operated by Agentic Tax Solutions LLC. The official website is agenttax.io. Our open-source components, SDKs and social account are listed under Official AgentTax properties on this page.
Is agenttax.io the official AgentTax website?
Yes. agenttax.io is the only official AgentTax website. The complete list of properties we operate is published on this page and in the site’s Organization structured data. Any other site using the AgentTax name is not operated by us.
Is AgentTax free?
There is a free tier that requires no credit card, and a demo mode that requires no account at all. Paid tiers are available for higher call volumes, and x402 pay-per-call works without an account. Current tiers and limits are on the pricing page.
Does AgentTax give tax advice?
No. AgentTax is a calculation and documentation tool. Its output is informational and does not constitute tax advice. Where the law is genuinely unsettled for agent transactions, the engine defaults to the more conservative treatment and says so in the response rather than presenting a contested position as settled.
What does AgentTax cover?
51 US jurisdictions — all 50 states plus the District of Columbia — with 302 zip-level local rates for city, county and district add-ons. It covers sales tax, use tax, economic nexus monitoring, capital gains lot accounting and IRS Form 1099-DA export.
How do I integrate AgentTax?
Sign up for a key and POST a transaction to /api/v1/calculate, or skip signup and use demo mode. There are official SDKs for Python and Node, an MCP server for agent frameworks, and a machine-readable integration guide at /api/v1/agents that is always current.
See what it returns on a real transaction
The playground runs a live calculation with no account and no credit card. The free tier adds the full audit trail.