{
  "id": "amortization-schedule-equal-principal-payments-calculator",
  "version": "1.0.0",
  "name": "Amortization Schedule Calculator: Equal Principal Payments",
  "shortName": "Amortization Schedule Calculator: Equal Pr",
  "description": "Create a loan schedule with the same principal amount paid every period and declining total payments.",
  "category": "Finance",
  "categorySlug": "finance",
  "keywords": [
    "amortization",
    "schedule",
    "calculator",
    "equal",
    "principal",
    "payments",
    "amortization schedule equal principal payments calculator"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/amortization-schedule-equal-principal-payments-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."
  },
  "urls": {
    "page": "/calculator/amortization-schedule-equal-principal-payments-calculator/",
    "definition": "/calculator/amortization-schedule-equal-principal-payments-calculator/definition.json",
    "schema": "/calculator/amortization-schedule-equal-principal-payments-calculator/schema.json",
    "llms": "/calculator/amortization-schedule-equal-principal-payments-calculator/llms.txt",
    "legacyDefinition": "/calculator/amortization-schedule-equal-principal-payments-calculator.json"
  },
  "queryExample": "https://askcalculators.com/calculator/amortization-schedule-equal-principal-payments-calculator/?principal=100000&annualRate=6&paymentsPerYear=12&years=5",
  "queryParameters": {
    "principal": {
      "label": "Loan principal",
      "type": "money",
      "required": true,
      "default": 100000
    },
    "annualRate": {
      "label": "Annual interest rate",
      "type": "percent",
      "required": true,
      "default": 6
    },
    "paymentsPerYear": {
      "label": "Payments per year",
      "type": "number",
      "required": true,
      "default": 12
    },
    "years": {
      "label": "Loan term in years",
      "type": "number",
      "required": true,
      "default": 5
    }
  },
  "inputs": [
    {
      "id": "principal",
      "label": "Loan principal",
      "type": "money",
      "required": true,
      "defaultValue": 100000,
      "min": 0.01,
      "step": 100
    },
    {
      "id": "annualRate",
      "label": "Annual interest rate",
      "type": "percent",
      "required": true,
      "defaultValue": 6,
      "min": 0,
      "max": 100,
      "step": 0.01
    },
    {
      "id": "paymentsPerYear",
      "label": "Payments per year",
      "type": "number",
      "required": true,
      "defaultValue": 12,
      "min": 1,
      "max": 365,
      "step": 1
    },
    {
      "id": "years",
      "label": "Loan term in years",
      "type": "number",
      "required": true,
      "defaultValue": 5,
      "min": 0.01,
      "max": 100,
      "step": 0.25
    }
  ],
  "outputs": [
    {
      "id": "firstPayment",
      "label": "First payment",
      "format": "currency",
      "primary": true
    },
    {
      "id": "lastPayment",
      "label": "Last payment",
      "format": "currency"
    },
    {
      "id": "principalPerPayment",
      "label": "Principal per payment",
      "format": "currency"
    },
    {
      "id": "totalInterest",
      "label": "Total interest",
      "format": "currency"
    },
    {
      "id": "totalPaid",
      "label": "Total paid",
      "format": "currency"
    },
    {
      "id": "paymentCount",
      "label": "Number of payments",
      "format": "integer"
    }
  ],
  "formula": {
    "expression": "principal payment = original principal ÷ number of payments; interest = opening balance × periodic rate"
  },
  "examples": [
    {
      "label": "Reproducible default-input example (not a personal recommendation)",
      "inputs": {
        "principal": 100000,
        "annualRate": 6,
        "paymentsPerYear": 12,
        "years": 5
      }
    }
  ],
  "sources": []
}