site

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: "Send my contact details to up to three accountancy and tax firms, chosen by IHT 2027 Calculator, who'll contact me directly. I'll be emailed each firm's name as my details go to it, and can stop any more firms getting them."

{
  "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: Send my contact details to up to three accountancy and tax firms, chosen by IHT 2027 Calculator, who'll contact me directly. I'll be emailed each firm's name as my details go to it, and can stop any more firms getting them."
    },
    "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#"
}