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The inputs this calculator takes (with units, ranges and defaults), the outputs it returns, and the assumptions and tables behind it.

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Run the IHT calculator: today vs April 2027 calculator: Estate today (pension excluded); Estate from April 2027 (pension included); Tax-free allowance (2027 rules); IHT under current rules (pension outside estate). Missing inputs fall back to their documented defaults.

{
  "type": "object",
  "properties": {
    "property": {
      "type": "number",
      "minimum": 0,
      "maximum": 20000000,
      "description": "Your home (market value)",
      "default": 400000
    },
    "savings": {
      "type": "number",
      "minimum": 0,
      "maximum": 20000000,
      "description": "Other assets (savings, investments, contents)",
      "default": 150000
    },
    "pension": {
      "type": "number",
      "minimum": 0,
      "maximum": 10000000,
      "description": "Unused pension pot",
      "default": 300000
    },
    "debts": {
      "type": "number",
      "minimum": 0,
      "maximum": 10000000,
      "description": "Mortgage and other debts",
      "default": 0
    },
    "homeKids": {
      "type": "string",
      "description": "Home left to children or grandchildren",
      "default": "1"
    },
    "marital": {
      "type": "string",
      "description": "Allowances available",
      "default": "single"
    },
    "charity": {
      "type": "string",
      "description": "Leaving 10%+ of the estate to charity",
      "default": "0"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Read first. States plainly what submit_enquiry does on IHT 2027 Calculator: it starts an enquiry with human providers who quote directly. Nothing is bought, ordered or paid; no quote is guaranteed; it is free. Also returns who receives the details, the consent wording, and how the person confirms.

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Every field of the IHT 2027 Calculator enquiry: key, label, type, whether required, help text and the allowed options where there are any. Pass answers to submit_enquiry keyed by field key.

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Submits an enquiry to IHT 2027 Calculator — NOT a purchase, NOT a guaranteed quote. Step 1: call with the answers (keyed by field key from enquiry_fields) and consent=true; it validates and returns a summary, the consent line and a confirmation token — show the person the summary and the consent line. Step 2: only if the person agrees, call again with the same answers, consent=true and the confirmation token; the enquiry is then submitted, and the person receives an email with a link they must click before any provider sees it. Consent means the person has read and agreed to: "Happy for my details to go to a relevant estate planning professional, who'll contact me directly."

{
  "type": "object",
  "properties": {
    "answers": {
      "type": "object",
      "additionalProperties": {
        "type": [
          "string",
          "number",
          "boolean"
        ]
      },
      "description": "the person's answers, keyed by field key"
    },
    "consent": {
      "type": "boolean",
      "description": "true only when the person has agreed to: Happy for my details to go to a relevant estate planning professional, who'll contact me directly."
    },
    "confirmation": {
      "type": "string",
      "description": "the confirmation token from step 1, after the person has approved the summary"
    }
  },
  "required": [
    "answers",
    "consent"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}