Version 1.0 · Effective July 1, 2026. These Terms govern access to the Tax MCP API and related surfaces. Tax MCP is computation infrastructure, not a tax preparer or advisor — please read Sections 2, 3, and 7 closely.
By accessing or using the Tax MCP API and related surfaces (the “Service”), you (“Customer”) agree to these Terms. If you use the Service on behalf of an organization, you represent you are authorized to bind it.
Tax MCP is software computation infrastructure — a deterministic, coverage-bounded tax-compute API. It is not tax, legal, accounting, or financial advice, and it does not prepare, sign, file, or submit tax returns. It computes inside a documented supported envelope (see tax-capabilities and the docs) and returns a deterministic unsupported / needs_review decline outside it. It never emits a wrong-but-plausible number in place of a decline.
The Customer is the preparer-of-record and the filing-responsible party. The Customer is solely responsible for source-data completeness and accuracy, filing positions, professional judgment, review of every computed figure and decline, and all downstream use of the output. Use outside the documented supported envelope is not authorized for production filing workflows.
Use the Service only within the documented supported envelope and applicable law. Do not: exceed or circumvent quota / rate limits or authentication; resell raw compute as your own certified tax engine without your own review layer; misrepresent the Service as tax advice or as a filing/preparer service to your end users; or send unlawful content.
Keys authenticate your account and are shown once. You are responsible for safeguarding them and for all activity under them. Notify us promptly of any suspected compromise; we may revoke keys to protect the Service.
Fees and metering are as published on the pricing page. Billing is deterministic: a computed 200 and a deterministic 200 decline are billable; 4xx/5xx are unbilled; a retry with the same Idempotency-Key bills once; monthly limits fail closed with a hard 429 — there is no surprise overage billing. Free / evaluation use is subject to the nominal cap in Section 9.
The Service is provided “AS IS” and “AS AVAILABLE”, without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose, or fitness for any particular tax outcome. Determinism guarantees reproducibility, not correctness for the Customer’s specific facts — the Customer must review. Nothing herein creates a preparer, agency, fiduciary, or advisory relationship.
Tax MCP does not represent that it carries professional-liability / errors-and-omissions insurance. Nothing in the Service or these Terms implies insured, filing-grade, or professionally-warranted coverage.
To the maximum extent permitted by law, Tax MCP’s total aggregate liability arising out of or relating to the Service is capped at the fees the Customer paid for the Service in the twelve (12) months preceding the claim. For free / evaluation use, the cap is a nominal US $100. Tax MCP is not liable for indirect, incidental, special, consequential, or punitive damages, or for lost profits, data, or tax / interest / penalty exposure (including §6694 preparer penalties).
Tax MCP provides no indemnityfor the Customer’s tax positions, filings, preparer penalties, tax / interest / penalty exposure, or downstream end-user claims arising from the Customer’s use. The Customer indemnifies Tax MCPagainst claims arising from the Customer’s source data, product behavior, filings, use outside the supported scope, and any failure to review or escalate a computed result or decline.
We may suspend or terminate access for breach, security risk, or non-payment. You may stop using the Service at any time. Sections 3, 7–10, 12, and 13 survive termination.
We may update these Terms; material changes will be reflected with an updated version. These Terms are governed by the laws of the State of California, and the parties submit to the courts located in California for any dispute. The contracting party providing the Service is tax-mcp.com (“we” / “Tax MCP”). Continued use of the Service after an update takes effect constitutes acceptance of the updated Terms. Contact: support@tax-mcp.com.
These Terms, together with the pricing page and the documented supported envelope they reference, are the entire agreement between you and Tax MCP regarding the Service, and supersede any prior or contemporaneous statements, marketing, or representations. If any provision is held unenforceable, it is limited or severed to the minimum extent necessary and the remaining provisions stay in effect. Our failure to enforce a provision is not a waiver of it.
The notice carried on API compute and reconcile responses (the legal_notice field) reads:
Computation support only. Not tax, legal, accounting, or financial advice. Customer is responsible for review, filing positions, and use only within the documented supported envelope.