UK Rules & Rates

List rule topics (e.g. income_tax, vat) with the number of rules in each.

{
  "type": "object",
  "properties": {},
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Get the UK rate/threshold in force for a key on a date (default today, Europe/London). Returns value, unit, effective dates and source. Paid: $0.005 USD per call via x402, or use an API key (see /pricing).

{
  "type": "object",
  "properties": {
    "key": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100,
      "pattern": "^[a-z0-9_]+$",
      "description": "Rule key, e.g. vat_registration_threshold"
    },
    "date": {
      "description": "YYYY-MM-DD; defaults to today in Europe/London",
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
    },
    "jurisdiction": {
      "description": "Defaults to UK. Falls back to rUK/UK when no specific row exists.",
      "type": "string",
      "enum": [
        "UK",
        "England",
        "Scotland",
        "Wales",
        "NI",
        "rUK"
      ]
    }
  },
  "required": [
    "key"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Free. Finds rule keys. Use get_rate (paid) to get the value in force on a date.

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 2,
      "maxLength": 100,
      "description": "Search text, e.g. 'vat threshold'"
    }
  },
  "required": [
    "query"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Get every version of a rule, ordered by applies_from. Paid: $0.005 USD per call via x402, or use an API key (see /pricing).

{
  "type": "object",
  "properties": {
    "key": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100,
      "pattern": "^[a-z0-9_]+$"
    },
    "jurisdiction": {
      "description": "Omit for all jurisdictions",
      "type": "string",
      "enum": [
        "UK",
        "England",
        "Scotland",
        "Wales",
        "NI",
        "rUK"
      ]
    }
  },
  "required": [
    "key"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

List UK tax/payroll deadlines. Fixed-date deadlines get the next due date on or after from_date (default today, Europe/London) and are filtered to to_date; deadlines that depend on your own period (e.g. VAT, Corporation Tax, Companies House) follow with next_due null and a plain-English recurrence_rule. Paid: $0.005 USD per call via x402, or use an API key (see /pricing).

{
  "type": "object",
  "properties": {
    "from_date": {
      "description": "YYYY-MM-DD; defaults to today in Europe/London",
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
    },
    "to_date": {
      "description": "YYYY-MM-DD",
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Search Companies House for UK companies by name. Free. Returns up to 10 matches (name, company number, status, incorporation date) so you can pick the right company_number for check_uk_business.

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 2,
      "maxLength": 100,
      "description": "Company name, e.g. Tesco"
    }
  },
  "required": [
    "query"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Sourced check of a UK company from Companies House: status, type, incorporation date, registered office, SIC codes, filing health (accounts and confirmation statement overdue and by how many days, plus the GOV.UK late filing penalty band if accounts are overdue), insolvency and charges flags, active officers and PSCs, each with a source_url. VAT check: coming soon (a vat_number is accepted but not checked yet). Not a credit check, sanctions or PEP screening. Counts as 2 calls on an API key plan. Paid: $0.02 USD per call via x402, or use an API key (see /pricing).

{
  "type": "object",
  "properties": {
    "company_number": {
      "type": "string",
      "minLength": 1,
      "maxLength": 12,
      "description": "Companies House number, e.g. 00445790 or SC123456 (find it with search_uk_company)"
    },
    "vat_number": {
      "description": "Optional UK VAT number, e.g. GB123456789 (VAT check: coming soon, not checked yet)",
      "type": "string",
      "minLength": 9,
      "maxLength": 20
    }
  },
  "required": [
    "company_number"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}