{
  "calculator": "invoice-late-fee-interest-calculator",
  "title": "Invoice Late Fee & Interest Calculator",
  "site": "AI Biz Hub",
  "input": {},
  "defaults_used": {
    "invoice_amount": 5400,
    "days_late": 24,
    "annual_interest_percent": 12,
    "fixed_late_fee": 40,
    "grace_days": 7
  },
  "result": {
    "primaryLabel": "Total amount due",
    "primaryValue": 5470.18,
    "primaryFormat": "currency",
    "summary": "17 chargeable days (24 late minus a 7-day grace period) at 12% a year add $30.18 of simple interest, plus the $40 late fee. Check that your contract terms and local law allow these charges.",
    "metrics": [
      {
        "label": "Chargeable days",
        "value": 17,
        "format": "days"
      },
      {
        "label": "Late fee",
        "value": 40,
        "format": "currency"
      },
      {
        "label": "Interest",
        "value": 30.18,
        "format": "currency"
      },
      {
        "label": "Effective penalty",
        "value": 1.3,
        "format": "percent"
      }
    ],
    "chart": {
      "title": "What the client owes",
      "bars": [
        {
          "label": "Invoice",
          "value": 5400,
          "format": "currency"
        },
        {
          "label": "Interest",
          "value": 30.18,
          "format": "currency"
        },
        {
          "label": "Late fee",
          "value": 40,
          "format": "currency"
        },
        {
          "label": "Total due",
          "value": 5470.18,
          "format": "currency",
          "emphasis": true
        }
      ]
    },
    "warnings": [],
    "assumptionsEcho": {
      "invoice_amount": 5400,
      "days_late": 24,
      "annual_interest_percent": 12,
      "fixed_late_fee": 40,
      "grace_days": 7
    }
  },
  "provenance": {
    "run": "https://aibizhub.io/api/run/invoice-late-fee-interest-calculator",
    "page": "https://aibizhub.io/invoice-late-fee-interest-calculator/",
    "methodology": "https://aibizhub.io/invoice-late-fee-interest-calculator/",
    "contract": "https://aibizhub.io/contracts/invoice-late-fee-interest-calculator.json",
    "engine": "https://aibizhub.io/engines/invoice-late-fee-interest-calculator.js",
    "engine_sha256": "04ddded09e0620a6c35dabd2ee5230be36719f280ffc8ed586a048c04b9a4585",
    "build": "42c727dd573e245d1be09199a062c665d7f6f47e",
    "prices_verified": "2026-10-24",
    "prices_source": "https://aidevhub.io/api/models.json"
  },
  "disclaimer": "Business planning estimates — not legal, tax, or accounting advice.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "cite": "AI Biz Hub, Invoice Late Fee & Interest Calculator (engine 04ddded09e06), https://aibizhub.io/api/run/invoice-late-fee-interest-calculator"
}