AI2Fin (2Fin) Tax MCP

Company tax estimate (139 countries)

company_tax_estimate

Read-onlyIdempotent

Estimate company/corporate income tax on an annual profit at the headline rate for 139 countries (28 verified against the national authority; the rest are indicative OECD headline rates, and the answer says "not verified — confirm with" the authority). Use it for company profit questions; individuals belong to income_tax_estimate. smallBusiness applies the small-company rate only where it covers all of the company's income (AU, IN); where the reduced rate is a profit band (UK small profits, the Canadian small-business deduction and similar) it is noted, not applied. Headline-rate arithmetic only: state and provincial tax, surcharges and marginal relief are named in the note, not computed. Each answer cites the company-tax source and date — not the GST/VAT one. A negative profit returns an explanation (losses carry forward), never a negative tax; a country not covered says so. Results may include one sourced background fact (relatedFact); the figures do not depend on it.

Input Schema

TableJSON Schema

Name	Required	Description
`profit`	Yes	Annual taxable profit in local currency; a negative value (a loss) returns an explanatory message instead of tax
`country`	Yes	2-letter ISO code of a covered country (upper case)
`smallBusiness`	No	Apply the small-company rate — honoured only where it covers all income (AU, IN); elsewhere the reduced rate is noted instead

Output Schema

TableJSON Schema

Name	Required	Description
`tax`	Yes	Company tax on the profit (local currency, rounded)
`note`	Yes	What the headline calculation excludes (state/provincial tax, surcharge/cess, marginal relief …)
`source`	Yes	The national tax authority the figures were verified against (e.g. 'ATO — ato.gov.au')
`country`	Yes	Country estimated (2-letter ISO code)
`afterTax`	Yes	Profit after tax
`taxLabel`	Yes	The country's name for the tax, e.g. 'Corporation Tax'
`sourceUrl`	No	https link to the authority page the rate was verified against. Present only on rate answers backed by a verified ledger row — absent (never empty) otherwise, so its presence is itself the claim
`disclaimer`	Yes	General-information note that must accompany any figure shown to a person
`mayBeStale`	Yes	True once the verification date is over a year old — re-confirm with the authority
`rateApplied`	Yes	Rate actually applied, as a fraction
`relatedFact`	No	One sourced background fact about the country's company tax; the figures do not depend on it. Absent when no sourced fact fits.
`standardRate`	No	The standard (headline) rate, as a fraction
`effectiveFrom`	No	ISO date the rate set in use took effect
`usedSmallRate`	No	Whether the small-company rate was applied
`dataVerifiedOn`	Yes	ISO date the rate data was last confirmed against the authority
`smallCompanyRate`	No	The small-company rate on file, when there is one

Schema Changelog

Changes observed during successful MCP inspections.

Changed11 schema fields changedOct 10, 2026

changedInput schema / properties / country / description

Previous value: -"Country with source-verified company-tax data"New value: +"2-letter ISO code of a covered country (upper case)"

changedInput schema / properties / country / enum

Previous value: -[
-  "AU",
-  "US",
-  "GB",
-  "IN",
-  "CA"
-]New value: +[
+  "AD",
+  "AE",
+  "AG",
+  "AL",
+  "AM",
+  "AO",
+  "AR",
+  "AT",
+  "AU",
+  "AZ",
+  "BA",
+  "BB",
+  "BE",
+  "BF",
+  "BG",
+  "BH",
+  "BJ",
+  "BN",
+  "BR",
+  "BS",
+  "BT",
+  "BW",
+  "BZ",
+  "CA",
+  "CD",
+  "CG",
+  "CH",
+  "CI",
+  "CL",
+  "CM",
+  "CN",
+  "CO",
+  "CR",
+  "CV",
+  "CY",
+  "CZ",
+  "DE",
+  "DJ",
+  "DK",
+  "DM",
+  "DO",
+  "EC",
+  "EE",
+  "EG",
+  "ES",
+  "FI",
+  "FJ",
+  "FR",
+  "GA",
+  "GB",
+  "GD",
+  "GE",
+  "GH",
+  "GR",
+  "GT",
+  "HK",
+  "HN",
+  "HR",
+  "HT",
+  "HU",
+  "ID",
+  "IE",
+  "IL",
+  "IN",
+  "IS",
+  "IT",
+  "JM",
+  "JO",
+  "JP",
+  "KE",
+  "KN",
+  "KR",
+  "KW",
+  "KZ",
+  "LC",
+  "LI",
+  "LK",
+  "LR",
+  "LT",
+  "LU",
+  "LV",
+  "MA",
+  "MC",
+  "MD",
+  "ME",
+  "MK",
+  "MN",
+  "MO",
+  "MR",
+  "MT",
+  "MU",
+  "MV",
+  "MX",
+  "MY",
+  "NA",
+  "NG",
+  "NL",
+  "NO",
+  "NZ",
+  "OM",
+  "PA",
+  "PE",
+  "PG",
+  "PH",
+  "PK",
+  "PL",
+  "PT",
+  "PY",
+  "QA",
+  "RO",
+  "RS",
+  "RU",
+  "SA",
+  "SC",
+  "SE",
+  "SG",
+  "SI",
+  "SK",
+  "SL",
+  "SM",
+  "SN",
+  "SZ",
+  "TG",
+  "TH",
+  "TN",
+  "TR",
+  "TT",
+  "TW",
+  "UA",
+  "UG",
+  "US",
+  "UY",
+  "UZ",
+  "VC",
+  "VN",
+  "WS",
+  "ZA",
+  "ZM",
+  "ZW"
+]

changedInput schema / properties / smallBusiness / description

Previous value: -"Apply the small-business/concessional rate — only honoured where it covers all income (AU base-rate entity, IN s.115BAA); GB/CA thresholds are noted instead"New value: +"Apply the small-company rate — honoured only where it covers all income (AU, IN); elsewhere the reduced rate is noted instead"

changedOutput schema / properties / country / description

Previous value: -"Country estimated"New value: +"Country estimated (2-letter ISO code)"

removedOutput schema / properties / country / enum

Removed value: -[
-  "AU",
-  "US",
-  "GB",
-  "IN",
-  "CA"
-]

addedOutput schema / properties / effectiveFrom

Added value: +{
+  "description": "ISO date the rate set in use took effect",
+  "type": "string"
+}

addedOutput schema / properties / relatedFact

Added value: +{
+  "additionalProperties": false,
+  "description": "One sourced background fact about the country's company tax; the figures do not depend on it. Absent when no sourced fact fits.",
+  "properties": {
+    "context": {
+      "description": "Present on a state or provincial answer: the fact is about the country as a whole",
+      "enum": [
+        "national"
+      ],
+      "type": "string"
+    },
+    "country": {
+      "description": "2-letter ISO code of the country the fact is about",
+      "type": "string"
+    },
+    "detail": {
+      "description": "Longer supporting detail, when the corpus has it",
+      "type": "string"
+    },
+    "fact": {
+      "description": "The fact, in one or two sentences",
+      "type": "string"
+    },
+    "kind": {
+      "description": "'origin' = when the tax began and what it replaced; 'anniversary' = the same, on the anniversary of its start date; 'story' = a dated story from the facts corpus",
+      "enum": [
+        "origin",
+        "story",
+        "anniversary"
+      ],
+      "type": "string"
+    },
+    "more": {
+      "description": "The tool that returns the full sourced fact set for this country",
+      "enum": [
+        "tax_facts"
+      ],
+      "type": "string"
+    },
+    "sourceName": {
+      "description": "Who the fact is sourced to",
+      "type": "string"
+    },
+    "sourceUrl": {
+      "description": "Link to that source — always present",
+      "type": "string"
+    },
+    "topic": {
+      "description": "Which tax the fact is about",
+      "enum": [
+        "gst",
+        "income",
+        "company",
+        "cgt",
+        "super",
+        "studentloan",
+        "general"
+      ],
+      "type": "string"
+    },
+    "verifiedDate": {
+      "description": "ISO date the fact was last checked against its source, when recorded",
+      "type": "string"
+    }
+  },
+  "required": [
+    "kind",
+    "topic",
+    "country",
+    "fact",
+    "sourceName",
+    "sourceUrl",
+    "more"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / smallCompanyRate

Added value: +{
+  "description": "The small-company rate on file, when there is one",
+  "type": "number"
+}

addedOutput schema / properties / sourceUrl

Added value: +{
+  "description": "https link to the authority page the rate was verified against. Present only on rate answers backed by a verified ledger row — absent (never empty) otherwise, so its presence is itself the claim",
+  "type": "string"
+}

addedOutput schema / properties / standardRate

Added value: +{
+  "description": "The standard (headline) rate, as a fraction",
+  "type": "number"
+}

addedOutput schema / properties / usedSmallRate

Added value: +{
+  "description": "Whether the small-company rate was applied",
+  "type": "boolean"
+}

First observedJul 3, 2026

TDQS

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