{
  "id": "interest-only-mortgage-calculator",
  "version": "1.0.0",
  "name": "Interest Only Mortgage Calculator",
  "shortName": "Interest Only Mortgage",
  "description": "Estimate payments and total interest for a mortgage with an initial interest-only period followed by amortizing payments.",
  "category": "Finance",
  "categorySlug": "finance",
  "keywords": [
    "interest",
    "only",
    "mortgage",
    "calculator",
    "interest only mortgage calculator"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/interest-only-mortgage-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "1.0.0",
    "referenceCoverage": "references-pending",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "2026-09-01",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "Mortgage terms, escrow, insurance, taxes, fees, and adjustable-rate provisions can materially change actual payments.",
  "urls": {
    "page": "/calculator/interest-only-mortgage-calculator/",
    "definition": "/calculator/interest-only-mortgage-calculator/definition.json",
    "schema": "/calculator/interest-only-mortgage-calculator/schema.json",
    "llms": "/calculator/interest-only-mortgage-calculator/llms.txt",
    "legacyDefinition": "/calculator/interest-only-mortgage-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/interest-only-mortgage-calculator/?loanAmount=400000&annualRate=6.5&totalTermYears=30&interestOnlyYears=10",
  "queryParameters": {
    "loanAmount": {
      "label": "Mortgage principal",
      "type": "money",
      "required": true,
      "default": 400000
    },
    "annualRate": {
      "label": "Annual interest rate",
      "type": "percent",
      "required": true,
      "default": 6.5
    },
    "totalTermYears": {
      "label": "Total mortgage term in years",
      "type": "number",
      "required": true,
      "default": 30
    },
    "interestOnlyYears": {
      "label": "Interest-only years",
      "type": "number",
      "required": true,
      "default": 10
    }
  },
  "inputs": [
    {
      "id": "loanAmount",
      "label": "Mortgage principal",
      "type": "money",
      "required": true,
      "defaultValue": 400000,
      "min": 0.01,
      "step": 1000
    },
    {
      "id": "annualRate",
      "label": "Annual interest rate",
      "type": "percent",
      "required": true,
      "defaultValue": 6.5,
      "min": 0,
      "max": 100,
      "step": 0.01
    },
    {
      "id": "totalTermYears",
      "label": "Total mortgage term in years",
      "type": "number",
      "required": true,
      "defaultValue": 30,
      "min": 1,
      "max": 50,
      "step": 1
    },
    {
      "id": "interestOnlyYears",
      "label": "Interest-only years",
      "type": "number",
      "required": true,
      "defaultValue": 10,
      "min": 0,
      "max": 49,
      "step": 1
    }
  ],
  "outputs": [
    {
      "id": "interestOnlyPayment",
      "label": "Monthly interest-only payment",
      "format": "currency",
      "primary": true
    },
    {
      "id": "amortizingPayment",
      "label": "Monthly payment after interest-only period",
      "format": "currency"
    },
    {
      "id": "paymentIncrease",
      "label": "Payment increase",
      "format": "currency"
    },
    {
      "id": "totalInterest",
      "label": "Total interest over full term",
      "format": "currency"
    },
    {
      "id": "totalPaid",
      "label": "Total paid",
      "format": "currency"
    }
  ],
  "formula": {
    "expression": "interest-only payment = principal × annual rate ÷ 12; remaining principal is amortized over the remaining term"
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "loanAmount": 400000,
        "annualRate": 6.5,
        "totalTermYears": 30,
        "interestOnlyYears": 10
      }
    }
  ],
  "sources": []
}