Tax Law Search

Give AI assistants citable tax sources through one MCP connection. Search by country and, for the United States, state. Retrieve relevant excerpts, follow the original publisher's link and resolve the exact source edition before citing it. Supported jurisdictions share this one product and its existing pricing.

Supported countries and coverage

Verified coverage as of 14 November 2026 (UTC):

Country	Search selectors	Verified coverage
Portugal	country: "PT"	Tax codes, guides, forms, treaties, rulings, circulars and selected amending legislation
United States	country: "US" plus a supported state postal code	Selected statutes, tax-agency publications and public-university guidance in the 36 states listed below

Verified U.S. states: Alabama (AL), Alaska (AK), Arkansas (AR), California (CA), Colorado (CO), Delaware (DE), Florida (FL), Georgia (GA), Idaho (ID), Illinois (IL), Indiana (IN), Iowa (IA), Kentucky (KY), Louisiana (LA), Maine (ME), Maryland (MD), Michigan (MI), Minnesota (MN), Mississippi (MS), Montana (MT), Nebraska (NE), Nevada (NV), New Hampshire (NH), New Mexico (NM), New York (NY), North Carolina (NC), North Dakota (ND), Ohio (OH), Oklahoma (OK), Oregon (OR), Rhode Island (RI), South Carolina (SC), Tennessee (TN), Texas (TX), Utah (UT), Virginia (VA).

U.S. federal/IRS sources and the remaining states are still being prepared or validated. They are not yet included in supported coverage. Use the verified list above when choosing a collection; list_tax_jurisdictions also provides live catalogue information. Coverage is selected and non-exhaustive: it does not include every law, local tax rule, publication or historical release. Source types and the depth of coverage differ by state; Tennessee currently contains selected public-university tax guidance rather than the full state code.

Search in the publication's original language

Use Portuguese for Portugal and English for most U.S. sources. Keep the original legal terms, code names, acronyms and article or section numbers. If the user's question is in another language, translate the search terms into the publication's language before searching. Searches are not English-only, and choosing a country or state does not automatically translate a query or source.

For example, search Portugal for benefícios fiscais EBF, not only its English translation. Search California using its original legal terminology and section numbers when known.

Connect and search

Connect to https://server-1794441520779.mcpize.run with your MCPize client credentials. The existing address remains unchanged; all supported jurisdictions use this same server and subscription.

The three read-only tools are:

• list_tax_jurisdictions() — inspect the live country/state catalogue. Refer to the verified coverage above while additional collections are being validated.
• search_tax_law(query, country, state?, limit?, source_type?) — search the selected jurisdiction. query accepts 1–2,000 characters; limit is 1–10, default 5. Select PT for Portugal, or US and a supported state such as CA. Available source types differ by collection. Portugal supports tax_code, guide, form, treaty, ruling, circular and legislation.
• get_tax_source(source_ref) — resolve a returned reference to the original publisher URL, exact edition, source hash and retained history metadata. Keep the jurisdiction prefix: for example, PT:<document_id> or US-CA:<document_id>. Copy the actual reference from a search result.

Portugal example:

{"query": "benefícios fiscais EBF", "country": "PT", "limit": 3}

U.S. state example:

{"query": "California income tax filing requirements exemptions", "country": "US", "state": "CA", "limit": 5}

Use each result's source_ref with get_tax_source, then cite the original source_url, title, edition and relevant excerpt. Results retain native document and chunk references, SHA-256 hashes and archive references so the source can be checked. An archive reference identifies a retained edition; it does not grant access to private storage.

Searches stay within the requested jurisdiction. Unsupported selectors do not silently fall back to another country or state. Once federal coverage is verified, country: "US" with no state will select federal sources; it is not a combined search across all states. Existing search_portuguese_tax_law and get_portuguese_tax_source calls remain for compatibility.

Monthly refreshes and historical editions

Verified collections have monthly refresh schedules. Previously imported editions, source hashes and publisher/year metadata are retained when a new edition is found. History starts with the editions actually collected; this is not a promise of every past release. Publisher dates, year mentions and observation dates do not establish legal applicability. Check the original publication for the tax year, effective date and amendments relevant to the question. Verify scanned pages, figures, formulas and complex tables against the original.

Plans

The Free plan includes 50 requests per month. Pro costs $9 per month for 1,000 requests. Requests across supported jurisdictions share the same plan allowance. Free and Pro limits are 10 and 30 requests per minute respectively; no overage billing is enabled. Discovery, searches and source lookups are MCP requests.

Scope

This service searches public sources; it does not provide personalized tax advice. It does not accept private tax returns, file uploads, arbitrary URLs or customer-account access. Clients receive source references rather than underlying infrastructure credentials.