{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://askcalculators.com/calculator/mortgage-payoff-calculator/schema.json",
  "title": "Mortgage Payoff Calculator inputs",
  "description": "See how much time and interest you can save by making extra payments on your mortgage.",
  "type": "object",
  "properties": {
    "balance": {
      "title": "Current Balance ($)",
      "type": "number",
      "default": 250000
    },
    "rate": {
      "title": "Interest Rate (%)",
      "type": "number",
      "default": 6.5
    },
    "currentPayment": {
      "title": "Current Monthly Payment ($)",
      "type": "number",
      "default": 1800
    },
    "extraPayment": {
      "title": "Extra Monthly Payment ($)",
      "type": "number",
      "default": 200
    }
  },
  "required": [],
  "additionalProperties": false,
  "x-askcalculators": {
    "version": "20.1.0",
    "calculatorUrl": "https://askcalculators.com/calculator/mortgage-payoff-calculator/",
    "queryExample": "https://askcalculators.com/calculator/mortgage-payoff-calculator/?balance=250000&rate=6.5&currentPayment=1800&extraPayment=200",
    "migrationStatus": "migrated",
    "reviewStatus": "pending",
    "pageStatus": "live",
    "workStatus": "pending",
    "migratedDate": "2026-08-18",
    "formula": {
      "expression": "Each month: interest = balance × monthly rate; payment = min(planned payment, balance + interest); new balance = balance + interest − payment. The two plans are simulated until payoff."
    },
    "quality": {
      "availability": "live",
      "technicalReviewRecord": "/reviews/mortgage-payoff-calculator.json",
      "qualifiedReview": "pending",
      "qualifiedReviewer": null,
      "qualifiedReviewDate": null,
      "formulaVersion": "20.1.0",
      "referenceCoverage": "references-listed",
      "releaseTestScope": "Flagship reference cases are specified in scripts/test-v20-1.mjs; consult release evidence for executed results.",
      "historicalMetadataDate": "2026-08-18",
      "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
    },
    "outputs": {
      "originalMonths": {
        "title": "Original payoff months",
        "type": "number",
        "x-format": "number"
      },
      "newMonths": {
        "title": "Accelerated payoff months",
        "type": "number",
        "x-format": "number"
      },
      "interestSaved": {
        "title": "Interest saved",
        "type": "number",
        "x-format": "currency",
        "x-primary": true
      },
      "monthsSaved": {
        "title": "Months saved",
        "type": "number",
        "x-format": "number"
      }
    }
  }
}