UK Rules & Rates

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Sourced, date-aware UK tax and payroll rates, deadlines and UK business checks, with GOV.UK sources.

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Copy this into your MCP client config:

{
  "mcpServers": {
    "UK Rules & Rates": {
      "url": "https://ukrules.dailylifeelevation.workers.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• list_topics read-only

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

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• get_rate read-only

  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).

  Parameters:

  • key (required) — string — Rule key, e.g. vat_registration_threshold
  • date — string — YYYY-MM-DD; defaults to today in Europe/London
  • jurisdiction — string — Defaults to UK. Falls back to rUK/UK when no specific row exists.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• search_rules read-only

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

  Parameters:

  • query (required) — string — Search text, e.g. 'vat threshold'

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• get_rate_history read-only

  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).

  Parameters:

  • key (required) — string
  • jurisdiction — string — Omit for all jurisdictions

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• list_deadlines read-only

  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).

  Parameters:

  • to_date — string — YYYY-MM-DD
  • from_date — string — YYYY-MM-DD; defaults to today in Europe/London

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• search_uk_company read-only

  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.

  Parameters:

  • query (required) — string — Company name, e.g. Tesco

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

• check_uk_business read-only

  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).

  Parameters:

  • company_number (required) — string — Companies House number, e.g. 00445790 or SC123456 (find it with search_uk_company)
  • vat_number — string — Optional UK VAT number, e.g. GB123456789 (VAT check: coming soon, not checked yet)

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• calculate_employer_ni read-only

  Paid. Calculates employer Class 1 National Insurance for one or more annual salaries on a date using verified UK Rules data. Use this instead of doing the maths yourself. Paid: $0.005 USD per call via x402, or use an API key (see /pricing).

  Parameters:

  • employees (required) — array — 1 to 200 employees
  • date — string — YYYY-MM-DD; defaults to today in Europe/London
  • apply_employment_allowance — boolean — Default false. If true, also returns the Employment Allowance in force and the net total

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

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Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.