{
  "slug": "hsa-growth",
  "title": "HSA Growth Calculator",
  "heading": "HSA Growth & Tax Savings Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/hsa-growth",
  "summary": "Triple-tax-advantaged balance projection.",
  "description": "An HSA is the only account that's deductible going in, tax-free growing, and tax-free coming out for medical costs. Invested, it beats most retirement accounts per dollar.",
  "formula": "FV of contributions + tax deduction value",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=hsa-growth",
  "inputs": [
    {
      "id": "annual",
      "label": "Annual contribution",
      "kind": "number",
      "hint": null,
      "default": 4300,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "spend",
      "label": "Annual medical spending from HSA",
      "kind": "number",
      "hint": null,
      "default": 800,
      "unit": "$",
      "min": 0,
      "max": null
    },
    {
      "id": "years",
      "label": "Years",
      "kind": "number",
      "hint": null,
      "default": 25,
      "unit": null,
      "min": 1,
      "max": 50
    },
    {
      "id": "rate",
      "label": "Annual return",
      "kind": "number",
      "hint": null,
      "default": 7,
      "unit": "%",
      "min": 0,
      "max": 20
    },
    {
      "id": "tax",
      "label": "Marginal tax rate",
      "kind": "number",
      "hint": null,
      "default": 24,
      "unit": "%",
      "min": 0,
      "max": 55
    },
    {
      "id": "balance",
      "label": "Current balance",
      "kind": "number",
      "hint": null,
      "default": 5000,
      "unit": "$",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "total",
      "label": "HSA balance",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "taxSaved",
      "label": "Lifetime tax savings",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "growth",
      "label": "Investment growth",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "contributed",
      "label": "Total contributed",
      "format": "currency",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Annual contribution: 4300 $",
      "Annual medical spending from HSA: 800 $",
      "Years: 25",
      "Annual return: 7 %",
      "Marginal tax rate: 24 %",
      "Current balance: 5000 $"
    ],
    "outputs": [
      "HSA balance: $248,509",
      "Lifetime tax savings: $25,800",
      "Investment growth: $156,009",
      "Total contributed: $92,500"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter annual contribution ($).",
      "Enter annual medical spending from hsa ($).",
      "Enter years.",
      "Enter annual return (%).",
      "Enter marginal tax rate (%).",
      "Enter current balance ($).",
      "Read your hsa balance on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "annual": 2600,
        "spend": 500,
        "years": 15,
        "rate": 7,
        "tax": 14,
        "balance": 3000
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "annual": 4300,
        "spend": 800,
        "years": 25,
        "rate": 7,
        "tax": 24,
        "balance": 5000
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "annual": 6900,
        "spend": 1300,
        "years": 40,
        "rate": 7,
        "tax": 38,
        "balance": 8000
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "How does the hsa growth & tax savings calculator work?",
      "a": "An HSA is the only account that's deductible going in, tax-free growing, and tax-free coming out for medical costs. Invested, it beats most retirement accounts per dollar. The underlying maths is: FV of contributions + tax deduction value"
    },
    {
      "q": "What do I need to enter?",
      "a": "6 values: annual contribution, annual medical spending from hsa, years, annual return, marginal tax rate, and current balance. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the hsa balance result mean?",
      "a": "It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — HSA Growth Calculator (https://www.revenuelab.fyi/toolbox/hsa-growth)"
}